netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* syn connection not replied with ack
@ 2012-08-28 17:03 mpe
  0 siblings, 0 replies; only message in thread
From: mpe @ 2012-08-28 17:03 UTC (permalink / raw)
  To: netdev

Hi all,
I have very very strange behaviour with a virtual machine (centos 6 
up-to-date).
Then I try to connect to it with a linux ssh client, I see the syn, but 
not the syn-ack replied. On the same target when I connect with windows 
machine, it reply correctly and the communication starts.

tshark show me with linux:
386.134073 172.18.0.160 -> 172.18.0.254 TCP 45092 > ssh [SYN] Seq=0 
Win=4240 Len=0 MSS=1060 TSV=497047 TSER=0 WS=5
389.134556 172.18.0.160 -> 172.18.0.254 TCP 45092 > ssh [SYN] Seq=0 
Win=4240 Len=0 MSS=1060 TSV=497798 TSER=0 WS=5
395.134926 172.18.0.160 -> 172.18.0.254 TCP 45092 > ssh [SYN] Seq=0 
Win=4240 Len=0 MSS=1060 TSV=499298 TSER=0 WS=5

and windows:
1099.091686 172.18.0.141 -> 172.18.0.254 TCP 32906 > ssh [SYN] Seq=0 
Win=8192 Len=0 MSS=1260 WS=8
1099.092934 172.18.0.254 -> 172.18.0.141 TCP ssh > 32906 [SYN, ACK] 
Seq=0 Ack=1 Win=5840 Len=0 MSS=1380
1099.092960 172.18.0.141 -> 172.18.0.254 TCP 32906 > ssh [ACK] Seq=1 
Ack=1 Win=65520 Len=0
1099.102017 172.18.0.254 -> 172.18.0.141 SSH Server Protocol: 
SSH-2.0-OpenSSH_4.3

iptables are disabled, no modules active (lsmod | grep ip show nothing)
I tried also to remove the vmware vmxnet3 module, reloaded, network 
restart, but the same.

But... if I reboot, the communication start for the next 2/3 days and 
after it stops another time.

Hope that someone can help me.

Michele

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2012-08-28 17:10 UTC | newest]

Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-08-28 17:03 syn connection not replied with ack mpe

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).