Office network very slow, show logging display ""aggressive and calming down" error

musikman1988musikman1988 Posts: 8Member ■□□□□□□□□□
Dear All,

Our office have 100 users. In recent, network was very slow, users access the website was very slowly. But they can ping website name successful.

I log on the egde router to "show logging", and it display some error as below:

My question is whether network has DOS attack? If so, what should I to do solve this issue?

Thanks in advance!!

BR Frank

Our network topology is ISP
2900
3750
2960X stack *3
LAP
end users

Error log as below:

May 16 08:13:55.969: %FW-4-TCP_OoO_SEG: Dropping TCP Segment: seq:2102491905 1064 bytes is out-of-order; expected seq:2102404865. Reason: TCP reassembly queue overflow - session 10.24.246.44:64405 to 140.207.195.36:80
May 16 08:14:43.604: %FW-3-RESPONDER_WND_SCALE_INI_NO_SCALE: Dropping packet - Invalid Window Scale option for session 10.24.246.53:55552 to 58.221.72.180:80 [Initiator(flag 0,factor 0) Responder (flag 1, factor 9)]
May 16 08:15:07.972: %FW-4-ALERT_OFF: calming down, count (46/900) current 1-min rate: 1796
May 16 08:15:10.344: %FW-4-ALERT_ON: getting aggressive, count (56/1000) current 1-min rate: 2001
May 16 08:15:54.052: %FW-4-ALERT_OFF: calming down, count (44/900) current 1-min rate: 1793
May 16 08:15:56.912: %FW-4-ALERT_ON: getting aggressive, count (59/1000) current 1-min rate: 2001
Sign In or Register to comment.