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Re: strange masq packets
- To: guy keren <choo(at-nospam)actcom.co.il>
- Subject: Re: strange masq packets
- From: Cedar Cox <cedarc(at-nospam)visionforisrael.com>
- Date: Mon, 19 Nov 2001 10:38:54 +0200 (IST)
- cc: linux-il(at-nospam)linux.org.il
- Delivered-To: linux.org.il-linux-il@linux.org.il
- In-Reply-To: <Pine.GSU.4.30_heb2.09.0111181634020.22878-100000@actcom.co.il>
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
On Sun, 18 Nov 2001, guy keren wrote:
>
> On Sun, 18 Nov 2001, Cedar Cox wrote:
>
> > Unusual System Events
> > =-=-=-=-=-=-=-=-=-=-=
> > Nov 17 22:36:53 bibi kernel: Packet log: output DENY ppp0 PROTO=6 192.117.108.105:61707 172.26.140.6:9044 L=40 S=0x00 I=3796 F=0x0000 T=255 (#2)
> > Nov 17 22:36:58 bibi kernel: Packet log: output DENY ppp0 PROTO=6 192.117.108.105:61707 172.26.140.6:9044 L=40 S=0x00 I=3844 F=0x0000 T=255 (#2)
> > Nov 17 22:37:10 bibi kernel: Packet log: output DENY ppp0 PROTO=6 192.117.108.105:61707 172.26.140.6:9044 L=40 S=0x00 I=3983 F=0x0000 T=255 (#2)
> > Nov 17 22:37:32 bibi kernel: Packet log: output DENY ppp0 PROTO=6 192.117.108.105:61707 172.26.140.6:9044 L=40 S=0x00 I=4063 F=0x0000 T=255 (#2)
> > Nov 17 22:38:18 bibi kernel: Packet log: output DENY ppp0 PROTO=6 192.117.108.105:61707 172.26.140.6:9044 L=40 S=0x00 I=4071 F=0x0000 T=255 (#2)
> > Nov 17 22:40:38 bibi kernel: Packet log: output DENY ppp0 PROTO=6 192.117.108.105:61733 172.26.140.7:9044 L=40 S=0x00 I=4317 F=0x0000 T=255 (#2)
> > Nov 17 22:40:49 bibi kernel: Packet log:output DENY ppp0 PROTO=6 192.117.108.105:61733 172.26.140.7:9044 L=40 S=0x00 I=4449 F=0x0000 T=255 (#2)
> > Nov 17 22:41:12 bibi kernel: Packet log: output DENY ppp0 PROTO=6 192.117.108.105:61733 172.26.140.7:9044 L=40 S=0x00 I=4477 F=0x0000 T=255 (#2)
> > Nov17 22:41:58 bibi kernel: Packet log: output DENY ppp0 PROTO=6
> > 192.117.108.105:61733 172.26.140.7:9044 L=40 S=0x00 I=4495 F=0x0000
> > T=255 (#2)
> >
> > Correct me if I'm wrong but it just looks like a internal (masq'ed) host
> > tried to contact the 172.26 network. We do not use this network so it was
> > sent to the default route but blocked on the way out (..just a safety so
> > no private traffic gets sent out the ppp0 interface).
>
> how do you know its a masqued ohst, and not your linux gateway that's
> emitting the traffic?
Because, (I think) outgoing ports 61000-65096 are only used for
masquarding and nothing else (someone please correct me if I am wrong).
> in any case, you could put a logging rule on the 'input' chain (or
> 'forward' chain) that logs any packet sent to 172.26.140.7:9044 using
> 'tcp', and see there where it comes from. assuming this still occures.
>
> --
> guy
Right. I think this is the only way to get what I want. I just didn't
know if there was some special logging for masquarding that I don't know
about. Thanks to everyone that answered :)
-Cedar
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