netdev - Re: [Bugme-new] [Bug 10350] New: SYN flooding crashed the kernel?

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Date:	Sun, 30 Mar 2008 00:22:00 +0100 (CET)
From:	Jesper Dangaard Brouer <hawk@...u.dk>
To:	Don Harter <donharter@...cast.net>
Cc:	harterc1@...cast.net, netdev <netdev@...r.kernel.org>
Subject: Re: [Bugme-new] [Bug 10350] New: SYN flooding crashed the kernel?


(not bug related, move along...)

On Fri, 28 Mar 2008, Don Harter wrote:

> My iptables config is partly:
> root:~>iptables -L
> Chain INPUT (policy DROP)
> target     prot opt source               destination
> ACCEPT     all  --  anywhere             anywhere
> ACCEPT     all  --  anywhere             anywhere            state  RELATED,ESTABLISHED
> input_ext  all  --  anywhere             anywhere
> input_ext  all  --  anywhere             anywhere
> LOG        all  --  anywhere             anywhere            limit: avg 3/min burst 5 LOG level warning tcp-options ip-options prefix `SFW2-IN-ILL-TARGET '
> DROP       all  --  anywhere             anywhere
>
> This is generated by the Susefirewall2.  I thought I understood iptables but 
> it seems that he first statement accepts all traffic and none of the others 
> get executed.  I took that statement out once and my web browser stopped 
> functioning.  I wasn't running apparmor and perhaps that plays a role 
> somewhere.  I may reboot and try to run the kernel as what suse calls 
> "failsafe".

You need to add "-v" to the iptables command, then you will probably see 
that the rules make sense, as you will be able to see the in and out 
interfaces.

  iptables -vL

Hilsen
   Jesper Brouer

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