[CentOS] iptables question

Robert Spangler mlists at zoominternet.net
Tue Oct 20 01:26:05 UTC 2009


On Monday 19 October 2009 17:18, Bowie Bailey wrote:

>  The logs on my mail server are filling up with this kind of thing:
>
>  Oct 19 17:03:51 bnofmail kernel: REJECT: IN=eth0 OUT=
>  MAC=XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX SRC=195.140.240.6
>  DST=XX.XX.XX.XX LEN=189 TOS=0x00 PREC=0x00 TTL=52 ID=6284 DF PROTO=TCP
>  SPT=25 DPT=32776 WINDOW=65535 RES=0x00 ACK PSH URGP=0
>
>  The source port is always 25 and the destination is a high-numbered
>  port.  The destination address is the private IP of the server.  These
>  seem to be related to outgoing email connections based on the source
>  IPs, but I don't know why they are not part of an established
>  connection.  The mail server seems to be running just fine regardless of
>  these blocked connections.
>
>  Any ideas?

Are you running a mixed firewall rule set?  Stateful and Connection or just 
one or the other?  Since you state a private address, I'm going to assume you 
mean something in the 192.168 or similar space, is NATting an issue?


-- 

Regards
Robert

Linux User #296285
http://counter.li.org


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