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Old 10-11-2015, 10:11 PM   #1
fire-fly
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Client application unable to connect to linux server, tcp packet has [SEW] flag set.


Hi
I have a window client application trying to linux server. At time the client was unable to connect to the linux server.
I did a tcpdump and notice the client packet has [SEW] flag set.

On the linux server /proc/sys/net/ipv4/tcp_ecn was set to 2, which was the default.

Should I change it to 1 ?

Thanks
 
Old 10-25-2015, 08:29 AM   #2
unSpawn
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Quote:
Originally Posted by fire-fly View Post
On the linux server /proc/sys/net/ipv4/tcp_ecn was set to 2, which was the default.
Should I change it to 1 ?
No, I would not suggest that. Over the years the Linux kernel has become quite good at managing things and furthermore TCP/IP is based on Open Standards so sane defaults are applied. Those are IMHO two good reasons for not tuning any network-related sysctls unless you have good reasons, no alternatives and know the implications of those changes.


Quote:
Originally Posted by fire-fly View Post
I have a window client application trying to linux server. At time the client was unable to connect to the linux server.
I did a tcpdump and notice the client packet has [SEW] flag set.
This does not provide enough information to base any suggestion on. Do capture full packets on the server, initiate the connection a few times and then examine network flows and payload in Wireshark? Also do check the servers network, system and daemon log entries for clues.
 
  


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