Possible SYN flooding

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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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