Re: Weird TCP flags?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Friday 12 December 2003 08:13, Chris Brenton wrote:
> On Thu, 2003-12-11 at 23:11, Ian Hunter wrote:
> > Dec 11 22:58:52 lucy kernel: Fwd DMZ->Internet DROP: IN=eth1 OUT=ppp0
> > SRC=192.168.254.242 DST=204.157.6.223 LEN=60 TOS=0x00 PREC=0x00 TTL=63
> > ID=56169 DF PROTO=TCP SPT=80 DPT=56319 WINDOW=32476 RES=0x00 ACK SYN
> > URGP=0
>
> My "guess" is, you are receiving a SYN packet from 204.157.6.223. This
> creates a state table entry with with a 60 second timer. Your system is
> taking longer than 60 seconds to respond, so iptables is removing the
> state table entry. Your system then responds causing the log entry shown
> above.
>

Hey Chris,

Is it normal for the server to send the ACK SYN to a high dport? I wouldn't 
have expected that.

Jeff


[Index of Archives]     [Linux Netfilter Development]     [Linux Kernel Networking Development]     [Netem]     [Berkeley Packet Filter]     [Linux Kernel Development]     [Advanced Routing & Traffice Control]     [Bugtraq]

  Powered by Linux