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From: Patrick McHardy <kaber@trash.net>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Harald Welte <laforge@netfilter.org>,
	Netfilter Development Mailinglist
	<netfilter-devel@lists.netfilter.org>
Subject: Re: MASQUERADE + DHCP problem
Date: Mon, 12 Sep 2005 01:57:22 +0200	[thread overview]
Message-ID: <4324C462.9040804@trash.net> (raw)
In-Reply-To: <1126481675.9832.3.camel@localhost.localdomain>

Rusty Russell wrote:
> On Sun, 2005-09-11 at 17:07 +0200, Patrick McHardy wrote:
> 
>>2) Add a special hack to masquerade to handle DHCP while no
>>   local address exists by looking at the port and src/dst
>>   address. Incredibly ugly and wrong :)
> 
> 
> If IP src is 0.0.0.0, let it through untouched.  Those packets are
> presumably not supposed to be masqueraded, so it's the Right Think
> AFAICT.
> 
> Will that fix DHCP?

Absolutely. Since these packets never get routed, the only possibility
when they can occur is when a local raw socket with IP_HDRINCL chooses
a source address of 0. In that case it definitely seems right to leave
the packet alone.

Thanks!

Patrick

  reply	other threads:[~2005-09-11 23:57 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-11 15:07 MASQUERADE + DHCP problem Patrick McHardy
2005-09-11 23:34 ` Rusty Russell
2005-09-11 23:57   ` Patrick McHardy [this message]
2005-09-12  3:07     ` David S. Miller
2005-09-12  8:52       ` Patrick McHardy

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