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Old 06-20-2010, 10:08 AM   #1
Registered: Feb 2003
Location: Orangeville
Distribution: Fedora
Posts: 469

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Question How do I verify marked packets?

I'm setting up things like this so that I can send web traffic via different routers. (like: all web requests from internal to outside go via rogers, but any inbound requests to my webserver go via acanac)

-A PREROUTING -p tcp --sport 80 -s -j MARK --set-mark 4

How do I see the mark in tcpdump? how can I send a test package and see which route it takes? How do I verify the rules are working:

ip rule
0: from all lookup local
32763: from all fwmark 0x6 lookup vpn
32764: from all fwmark 0x2 lookup rogers
32765: from all fwmark 0x4 lookup acanac
32766: from all lookup main
32767: from all lookup default
Old 06-20-2010, 11:21 AM   #2
Registered: Feb 2003
Location: Orangeville
Distribution: Fedora
Posts: 469

Original Poster
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Never mind seems I found it. Seems that the outbound packets were not getting marked. I had to add this line for that.

-A OUTPUT -p tcp --sport 80 -s -j MARK --set-mark 4


oh ya and added this to figure out out what was going on:

-A OUTPUT -p tcp --sport 80 -j LOG --log-level 4 --log-prefix "firewall debug http: "

Last edited by MikeyCarter; 06-20-2010 at 11:22 AM. Reason: added something.
Old 06-20-2010, 11:22 AM   #3
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Distribution: OpenSuse 11.1, Fedora 14, Ubuntu 12.04/12.10, FreeBSD 9.0
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You wont see those MARKS by tcpdump. They are for netfilter&kernel. As long as understand those marks even do not go out.


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