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Date: Mon, 9 Jan 2017 07:25:44 -0500
From: Neil Horman <nhorman@tuxdriver.com>
To: Sun Paul <paulrbk@gmail.com>
Cc: David Laight <David.Laight@aculab.com>,
        "linux-sctp@vger.kernel.org" <linux-sctp@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Problem on SCTP
Message-ID: <20170109122408.GA20973@hmswarspite.think-freely.org>
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On Mon, Jan 09, 2017 at 06:00:36PM +0800, Sun Paul wrote:
> Hi
> 
> the linux router just change the destination, so it can arrive on the
> the SERVER.
> 
Please post the relevant snippets from the client and server tcpdump
operations

Neil

> On Mon, Jan 9, 2017 at 5:51 PM, David Laight <David.Laight@aculab.com> wrote:
> > From: Sun Paul
> >> Sent: 09 January 2017 02:08
> >
> >> >> I am setting up a lab where the SCTP traffics from  client is passing
> >> >> through a linux router before reaching to the SCTP server running
> >> >> LKSCTP.
> >> >>
> >> >> The linux router did not change the source address of the client, so
> >> >> when it arrived to the SCTP server, the source address is the oriingal
> >> >> one.
> >>
> >> the INIT chunk arrive on the SERVER, but then no response. the
> >> application that using in SERVER is the same as the other test.
> >>
> >> I noticed one thing in Ethernet frame of the incoming packet on the
> >> SERVER compared to the one captured from the client is the LG bit on
> >> the source address.
> >>
> >> The LG bit is set to 0 on the request packet received in the
> >> SERVER,but it is 0 from the one originated on the client. willl it be
> >> the root cause?
> >
> > Which addresses are you talking about, and what do you mean by the LG bit?
> >
> > Is your linux 'router' just routing (ie IP forwarding) or is it doing NAT?
> > If it is changing the IP addresses then the addresses inside some SCTP
> > chunks also need changing.
> >
> >         David
> >
>