Re: [fw-wiz] Weird FW bridge stuff (Linux)

From: Chris Ditri (chrisd_at_better-investing.org)
Date: 12/10/03

  • Next message: Bill Royds: "RE: [fw-wiz] Stateful inspect on return web traffic - eek!"
    To: firewall-wizards@honor.icsalabs.com
    Date: Wed, 10 Dec 2003 15:58:43 -0500
    
    

    Thanks for the input guys.

    I had reconfigured my kernel to turn off debugging -- but I forgot to copy the
    bzImage -- so I was still using the old image (whoops).

    That seemed to clear up the log problem.

    I still don't know why 2.4.23 ignores my iptables commands...

    Thanks again.

    Chris

    On Tuesday 09 December 2003 03:51 pm, Chris Ditri wrote:
    > Hello.
    >
    > I have setup a linux ethernet bridge/firewall. Everything seemed to be
    > working pretty well, until one day I found that my /var/log/messages was
    > filled up with 14 gigabytes of this junk:
    >
    > Dec 9 15:47:55 kronos nf_hook: hook 4 already set.
    > Dec 9 15:47:55 kronos skb: pf=7 (unowned) dev=eth0 len=74
    > Dec 9 15:47:55 kronos nf_hook: hook 0 already set.
    > Dec 9 15:47:55 kronos skb: pf=2 (unowned) dev=br0 len=69
    > Dec 9 15:47:55 kronos PROTO=6 209.202.220.135:25 10.103.232.134:46016 L=69
    > S=0x00 I=7745 F=0x4000 T=50
    > Dec 9 15:47:55 kronos nf_hook: hook 0 already set.
    > Dec 9 15:47:55 kronos skb: pf=7 (unowned) dev=eth0 len=69
    > Dec 9 15:47:55 kronos nf_hook: hook 2 already set.
    > Dec 9 15:47:55 kronos skb: pf=2 (unowned) dev=eth1 len=69
    > Dec 9 15:47:55 kronos PROTO=6 209.202.220.135:25 10.103.232.134:46016 L=69
    > S=0x00 I=7745 F=0x4000 T=50
    > Dec 9 15:47:55 kronos nf_hook: hook 2 already set.
    > Dec 9 15:47:55 kronos skb: pf=7 (unowned) dev=eth1 len=69
    > Dec 9 15:47:55 kronos nf_hook: hook 4 already set.
    > Dec 9 15:47:55 kronos skb: pf=2 (unowned) dev=eth1 len=69
    > Dec 9 15:47:55 kronos PROTO=6 209.202.220.135:25 10.103.232.134:46016 L=69
    > S=0x00 I=7745 F=0x4000 T=50
    > Dec 9 15:47:55 kronos nf_hook: hook 4 already set.
    > Dec 9 15:47:55 kronos skb: pf=7 (unowned) dev=eth1 len=69
    > Dec 9 15:47:55 kronos nf_hook: hook 0 already set.
    > Dec 9 15:47:55 kronos skb: pf=2 (unowned) dev=br0 len=58
    > Dec 9 15:47:55 kronos PROTO=6 10.103.232.134:46016 209.202.220.135:25 L=58
    > S=0x00 I=14180 F=0x4000 T=64
    > Dec 9 15:47:55 kronos nf_hook: hook 0 already set.
    > Dec 9 15:47:55 kronos skb: pf=7 (unowned) dev=eth1 len=58
    > Dec 9 15:47:55 kronos nf_hook: hook 2 already set.
    > Dec 9 15:47:55 kronos skb: pf=2 (unowned) dev=eth0 len=58
    > Dec 9 15:47:55 kronos PROTO=6 10.103.232.134:46016 209.202.220.135:25 L=58
    > S=0x00 I=14180 F=0x4000 T=64
    > Dec 9 15:47:55 kronos nf_hook: hook 2 already set.
    > Dec 9 15:47:55 kronos skb: pf=7 (unowned) dev=eth0 len=58
    > Dec 9 15:47:55 kronos nf_hook: hook 4 already set.
    > Dec 9 15:47:55 kronos skb: pf=2 (unowned) dev=eth0 len=58
    > Dec 9 15:47:55 kronos PROTO=6 10.103.232.134:46016 209.202.220.135:25 L=58
    > S=0x00 I=14180 F=0x4000 T=64
    > Dec 9 15:47:55 kronos nf_hook: hook 4 already set.
    > Dec 9 15:47:55 kronos skb: pf=7 (unowned) dev=eth0 len=58
    >
    > I did some poking around, and I heard that this was because of a bug in the
    > 2.4.19 version of this software (patch for the kernel). So I downloaded
    > and compiled the kernel in 2.4.23 -- with the same exact config file. All
    > of a sudden none of my IPTABLES rules are not having any influence on
    > traffic! Bye-bye fiewall...
    >
    > I tried to apply the patch to my 2.4.23 kernel, but it fails. I cannot
    > find this version of a bridge patch for 2.4.23 anywhere. I have read that
    > people have gotten this sort of thing working with kernel 2.4.20 and up --
    > but no reference as to what they had to do to get it working right.
    >
    > What can I do?
    >
    > Thanks!
    >
    > Chris
    >
    >
    > _______________________________________________
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    > firewall-wizards@honor.icsalabs.com
    > http://honor.icsalabs.com/mailman/listinfo/firewall-wizards

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