From: Florian Westphal <fw@strlen.de>
To: Kristian Evensen <kristian.evensen@gmail.com>
Cc: netfilter@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: MASQUERADE/SNAT and multiple interfaces with the same IP
Date: Fri, 16 Aug 2013 13:04:43 +0200 [thread overview]
Message-ID: <20130816110443.GB5154@breakpoint.cc> (raw)
In-Reply-To: <CAKfDRXjXkY--PjXAa1m=As+Vf_1__WBokkTAE5BHg+gxsM9Yxw@mail.gmail.com>
Kristian Evensen <kristian.evensen@gmail.com> wrote:
> After spending long time looking at the source code, I can't figure
> out why this happens. Once the MASQUERADE/SNAT rule has been inserted,
> to me everything looks the same.
The MASQUERADE target zaps conntracks that it "owned" when the
associated link goes down, see masq_device_event() in ipt_MASQUERADE.c
Also, the nat core zaps conntracks when they are sent out on an
interface other than the original interface.
See nf_nat_oif_changed() in iptable_nat.c
next prev parent reply other threads:[~2013-08-16 11:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-16 10:55 MASQUERADE/SNAT and multiple interfaces with the same IP Kristian Evensen
2013-08-16 11:04 ` Florian Westphal [this message]
2013-08-16 11:14 ` Kristian Evensen
2013-08-16 11:18 ` Florian Westphal
2013-08-16 11:23 ` Kristian Evensen
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