From: Aleksandar Milivojevic <amilivojevic@pbl.ca>
To: netfilter@lists.netfilter.org
Subject: Re: Virtual interfaces
Date: Wed, 07 Jul 2004 08:50:19 -0500 [thread overview]
Message-ID: <40EBFF9B.4060603@pbl.ca> (raw)
In-Reply-To: <200407051642.19090.francesco.chicchiricco@eposse.it>
Dott. Francesco Chicchiriccò wrote:
> With physical interfaces only, all works well. When a try to filter traffic
> between 2 LANs attached to the same physical interface but with 2 different
> virtual IPs, it starts messing. Nothing works, I can't even log packets.
Netfilter does not know about virtual interfaces. Use physical
interface names in combination with source and/or destination addresses
(for example "-i eth0 -s 192.168.0.0/24").
From security side, you are not gaining anything by filtering between
two virutal interfaces on the same wire -- stations on those two
networks can talk to each other directly anyhow. If you haven't
disabled ICMP redirects, you'll see that Linux kernel is sending out
ICMP redirects telling 192.168.0.1 that 192.168.1.1 is on the same wire
and to talk to it directly.
next prev parent reply other threads:[~2004-07-07 13:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-05 14:42 Virtual interfaces Dott. Francesco Chicchiriccò
2004-07-07 9:27 ` Askar Ali Khan
2004-07-07 13:50 ` Aleksandar Milivojevic [this message]
[not found] <a0f69e5040704225918359fec@mail.gmail.com>
2004-07-05 6:27 ` virtual interfaces ip tables
2004-07-05 6:49 ` Ming-Ching Tiew
-- strict thread matches above, loose matches on Subject: below --
2004-07-05 4:54 ip tables
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