[Gluster-users] Possible SYN flooding

[Harshavardhana]

Perhaps a driver bug? - have you verified ethtool -S output?

On Wed, Apr 16, 2014 at 2:42 AM, Franco Broi <franco.broi at iongeo.com> wrote:
>
> I've increased my tcp_max_syn_backlog to 4096 in the hope it will
> prevent it from happening again but I'm not sure what caused it in the
> first place.
>
> On Wed, 2014-04-16 at 17:25 +0800, Franco Broi wrote:
>> Anyone seen this problem?
>>
>> server
>>
>> Apr 16 14:34:28 nas1 kernel: [7506182.154332] TCP: TCP: Possible SYN flooding on port 49156. Sending cookies.  Check SNMP counters.
>> Apr 16 14:34:31 nas1 kernel: [7506185.142589] TCP: TCP: Possible SYN flooding on port 49157. Sending cookies.  Check SNMP counters.
>> Apr 16 14:34:53 nas1 kernel: [7506207.126193] TCP: TCP: Possible SYN flooding on port 49159. Sending cookies.  Check SNMP counters.
>>
>> client
>>
>> Apr 16 14:34:21 charlie5 GlusterFS[6718]: [2014-04-16 06:34:21.710137] C [client-handshake.c:127:rpc_client_ping_timer_expired] 0-data-client-4: server 192.168.35.107:49157 has not responded in the last 42 seconds, disconnecting.
>> Apr 16 14:34:31 charlie5 GlusterFS[6718]: [2014-04-16 06:34:31.711605] C [client-handshake.c:127:rpc_client_ping_timer_expired] 0-data-client-2: server 192.168.35.107:49156 has not responded in the last 42 seconds, disconnecting.
>> Apr 16 14:35:13 charlie5 GlusterFS[6718]: [2014-04-16 06:35:13.758227] C [client-handshake.c:127:rpc_client_ping_timer_expired] 0-data-client-0: server 192.168.35.107:49159 has not responded in the last 42 seconds, disconnecting.
>>
>>
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>
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