<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;">Hi,</p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;">Thank you for your answers,</p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;">But, please ignore the content of the 'links' I have posted, I didn't mean
to send you those links. I just <span style="">did google to
find a solution for our cluster's problem 'Disconnecting:…'. However, because I
couldn't find a proper solution via googling, I posted it to Beowulf, so, I just
did copy-paste the sentence 'Disconnecting:…' in my gmail. That's why you can
see 'links' in my email.</span></p><span style=""><br>Returning to our problem, the results
of 'netstat –i' and '-s' are as follows, respectively.</span>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">Please note that: <span style=""> </span></span></p>
<p class="MsoNormal" dir="ltr" style="margin-left: 36pt; text-align: left; text-indent: -18pt; direction: ltr; unicode-bidi: embed;"><span style=""><span style="">a)<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span dir="ltr"><span style="">I use cat 6, </span></span></p>
<p class="MsoNormal" dir="ltr" style="margin-left: 36pt; text-align: left; text-indent: -18pt; direction: ltr; unicode-bidi: embed;"><span style=""><span style="">b)<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span dir="ltr"><span style="">it is nearly improbable to have
electricity noise</span></span></p>
<p class="MsoNormal" dir="ltr" style="margin-left: 36pt; text-align: left; text-indent: -18pt; direction: ltr; unicode-bidi: embed;"><span style=""><span style="">c)<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span dir="ltr"><span style="">the head-node has two NICs, eth0 is for
internal zone, i.e. computing nodes, which is running with no problem. eth1 is for
external zone, i.e. to be connected by our users via ssh. This one has
disconnecting problem. </span></span></p>
<p class="MsoNormal" dir="ltr" style="margin-left: 36pt; text-align: left; text-indent: -18pt; direction: ltr; unicode-bidi: embed;"><span style=""><span style="">d)<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span dir="ltr"><span style="">it doesn't seem that there is any SW/router
problem. Because in the same network, there is some other machine, which is
connected by users via ssh with no problem.</span></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">___________________________________________________________________</span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><b><span style="">[root@node01 ~]# netstat -i</span></b><b><span dir="rtl" style="font-family: "B Nazanin";" lang="FA">
</span></b></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">Kernel Interface table</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">Iface<span style=""> </span>MTU Met<span style=""> </span>RX-OK RX-ERR RX-DRP RX-OVR<span style="">
</span>TX-OK TX-ERR
TX-DRP TX-OVR
Flg</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">eth0<span style=""> </span>1500<span style="">
</span>0 586745989<span style=""> </span>0<span style=""> </span>0<span style="">
</span>0 598858710<span style=""> </span>0<span style=""> </span>0<span style="">
</span>0 BMRU</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">eth1<span style=""> </span>1500<span style="">
</span>0<span style=""> </span>701868<span style=""> </span>0<span style="">
</span>0<span style=""> </span>0<span style=""> </span>325542<span style="">
</span>0<span style=""> </span>0<span style=""> </span>0 BMRU</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">lo<span style=""> </span>16436<span style="">
</span>0<span style=""> </span>1959<span style=""> </span>0<span style="">
</span>0<span style=""> </span>0<span style=""> </span>1959<span style="">
</span>0<span style=""> </span>0<span style=""> </span>0 LRU</span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style=""> </span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><b><span style="">[root@node01 ~]# netstat -s</span></b><b><span dir="rtl" style="font-family: "B Nazanin";" lang="FA">
</span></b></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">Ip:</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>585891011 total packets received</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>0 forwarded</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>0 incoming packets discarded</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>585887228 incoming packets delivered</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>597668214 requests sent out</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">Icmp:</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>34 ICMP messages received</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>21 input ICMP message failed.</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>ICMP input histogram:</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>destination unreachable: 25</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>timeout in transit: 5</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>echo requests: 4</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>601 ICMP messages sent</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>0 ICMP messages failed</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>ICMP output histogram:</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>destination unreachable: 597</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>echo replies: 4</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">Tcp:</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>78 active connections openings</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>360 passive connection openings</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>0 failed connection attempts</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>18 connection resets received</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>8 connections established</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>585798178 segments received</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>597666644 segments send out</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>16197 segments retransmited</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>94 bad segments received.</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>1682 resets sent</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">Udp:</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>1005 packets received</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>596 packets to unknown port received.</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>0 packet receive errors</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>1019 packets sent</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">TcpExt:</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>2 resets received for embryonic SYN_RECV
sockets</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>26 packets pruned from receive queue
because of socket buffer overrun</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>ArpFilter: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>60 TCP sockets finished time wait in fast
timer</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>1 packets rejects in established
connections because of timestamp</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>734435 delayed acks sent</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>127 delayed acks further delayed because of
locked socket</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>Quick ack mode was activated 7963 times</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>724 packets directly queued to recvmsg
prequeue.</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>6030 packets directly received from backlog</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>164431 packets directly received from
prequeue</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>571897537 packets header predicted</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>138 packets header predicted and directly
queued to user</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>TCPPureAcks: 44870</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>TCPHPAcks: 458279645</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>TCPRenoRecovery: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>TCPSackRecovery: 2875</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>TCPSACKReneging: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>TCPFACKReorder: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>TCPSACKReorder: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span dir="ltr"></span><span dir="ltr"></span><span style=""><span dir="ltr"></span><span dir="ltr"></span><span style="">
</span>TCPRenoReorder: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPTSReorder: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPFullUndo: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPPartialUndo: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPDSACKUndo: 1</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPLossUndo: 7099</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPLoss: 626</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPLostRetransmit: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPRenoFailures: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPSackFailures: 1635</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPLossFailures: 169</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPFastRetrans: 4294</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPForwardRetrans: 23</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPSlowStartRetrans: 1130</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPTimeouts: 8329</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPRenoRecoveryFail: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPSackRecoveryFail: 279</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPSchedulerFailed: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPRcvCollapsed: 2731</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPDSACKOldSent: 8194</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPDSACKOfoSent: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPDSACKRecv: 7125</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPDSACKOfoRecv: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPAbortOnSyn: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPAbortOnData: 28</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPAbortOnClose: 8</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPAbortOnMemory: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPAbortOnTimeout: 12</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPAbortOnLinger: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPAbortFailed: 0</span><span dir="rtl" style="font-family: "B Nazanin";" lang="FA"></span></p>
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</span>TCPMemoryPressures: 0</span></p>
<p class="MsoNormal" dir="ltr" style="text-align: left; direction: ltr; unicode-bidi: embed;"><span style="">___________________________________________________________________</span></p>
-- <br>Best,<br>Ruhollah Moussavi Baygi
<br><br><div><span class="gmail_quote">On 5/29/07, <b class="gmail_sendername">Robert G. Brown</b> <<a href="mailto:rgb@phy.duke.edu">rgb@phy.duke.edu</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Sun, 27 May 2007, Ruhollah Moussavi Baygi wrote:<br><br>> Hi everybody at Beowulf,<br>><br>> I have a serious problem with ssh connection to our cluster. Every<br>> hint/help/suggestion, which can help me to solve it, is highly appreciated.
<br>><br>> Most of the time, when users want to connect and run their programs from<br>> their own PCs, the ssh connection failed, especially during transfer files<br>> from/to head-node. Our user's PCs are mainly WindowsXP, so they use packages
<br>> like SSH Secure Shell for connection and file transfer, or Putty for<br>> connection and WinSCP for file transfer.<br>><br>><br>> The error massage is as follows:<br>><br>> 'Disconnecting: Corrupted MAC on input'
<br><br>This sounds to me like hardware problems. What does your physical<br>network look like? Is it built with the right cables, within spec, with<br>decent switches? Do you see other evidence of network packet<br>corruption?
<br><br>> <<a href="http://www.google.com/history/url?url=http://ubuntuforums.org/showthread.php%3Ft%3D202076&ei=wkJZRsGfHZf-0gTehKXrDQ&sig2=lIzQGYq3zN0Tz2EC8b4dAw&zx=JGkABbsjtaA&ct=w">http://www.google.com/history/url?url=http://ubuntuforums.org/showthread.php%3Ft%3D202076&ei=wkJZRsGfHZf-0gTehKXrDQ&sig2=lIzQGYq3zN0Tz2EC8b4dAw&zx=JGkABbsjtaA&ct=w
</a>><br>><br>> or<br>><br>> 'Disconnecting: bad packet<br><br>Yes, sounds like bad hardware. Perhaps your cables aren't cat 5?<br>Perhaps your electrical power has noise? Perhaps your switch(es) are
<br>broken or have been taken over by trolls? This sounds like you're<br>failing packet checksum tests or experiencing pretty serious TCP<br>collision problems.<br><br>What do the network statistics look like on the interfaces in question?
<br><br> rgb<br><br>> length...<<a href="http://www.google.com/search?q=disconnecting:+bad+packet+length+from+windows+to+linux+machine&hl=en">http://www.google.com/search?q=disconnecting:+bad+packet+length+from+windows+to+linux+machine&hl=en
</a>>',<br>> followed by a long integer.<br>><br>><br>> This problem has practically made our cluster unusable. So, I would be<br>> thankful for any coming advice.<br>><br><br>--<br>Robert G. Brown
<a href="http://www.phy.duke.edu/~rgb/">http://www.phy.duke.edu/~rgb/</a><br>Duke University Dept. of Physics, Box 90305<br>Durham, N.C. 27708-0305<br>Phone: 1-919-660-2567 Fax: 919-660-2525 <a href="mailto:email:rgb@phy.duke.edu">
email:rgb@phy.duke.edu</a><br><br><br></blockquote></div><br><br clear="all"><br>-- <br>Best,<br>Ruhollah Moussavi Baygi