linux-kernel - Re: Problem on SCTP

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Date:   Mon, 9 Jan 2017 14:18:23 -0500
From:   Neil Horman <nhorman@...driver.com>
To:     Sun Paul <paulrbk@...il.com>
Cc:     David Laight <David.Laight@...lab.com>,
        "linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Problem on SCTP

On Tue, Jan 10, 2017 at 12:31:01AM +0800, Sun Paul wrote:
> what kind of information do you need? the whole INIT packet?
> 
That would be ideal.

> On Mon, Jan 9, 2017 at 8:25 PM, Neil Horman <nhorman@...driver.com> wrote:
> > 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@...lab.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
> >> >
> >>
> --
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