[erlang-questions] Multiple SCTP associations
Kenneth Flanagan
kenneth.flanagan@REDACTED
Mon Apr 21 16:07:51 CEST 2008
Hi Serge,
Thanks for that. It's multiple single homed I trying to use and I've
worked out what I'm doing wrong. Initially I had problems sending h.248
because I couldn't find hrl's for record #sctp_sndrcvinfo where you need
to change the ppid (7 for h.248). I eventually copied in the structure
to my own hrl and set assoc_id = 1 by default, so every instance of my
MGW tried to use the same.
Once I make assoc_id dynamic (i.e. different for every instance of the
MGW) it works fine. Thanks again for the mail. I've muddled my own way
with SCTP_o_erlang up to now. Nice to know someone can help out :)
Best Regards,
Ken.
-----Original Message-----
From: Serge Aleynikov [mailto:saleyn@REDACTED]
Sent: 20 April 2008 03:02
To: Kenneth Flanagan
Cc: erlang-questions@REDACTED
Subject: Re: [erlang-questions] Multiple SCTP associations
I am not able to reproduce your problem on Fedora Core 8, R11B-5. Note
that for the sake of example I opened the multi-homed server socket on
two IPs, though this works even if you augment the IPs (e.g.
gen_sctp:open(1234)).
NodeA:
4> f(S), {ok, S} =
gen_sctp:open([{port,1234},{ip,{192,168,0,14}},{ip,{192,168,0,13}}]).
{ok,#Port<0.97>}
5> gen_sctp:listen(S, true).
ok
6> gen_sctp:recv(S).
{ok,{{192,168,0,14},32785,[],{sctp_assoc_change,comm_up,0,10,10,4}}}
7> gen_sctp:recv(S).
{ok,{{192,168,0,13},32786,[],{sctp_assoc_change,comm_up,0,10,10,7}}}
8> gen_sctp:recv(S).
{ok,{{192,168,0,14},
32785,
[{sctp_sndrcvinfo,3,0,[],0,0,0,2115484281,0,4}],
<<"Test">>}}
NodeB:
1> f(S), {ok, S} = gen_sctp:open([{ip, {192,168,0,14}}]).
{ok,#Port<0.100>}
2> f(A), {ok, A} = gen_sctp:connect(S, {192,168,0,13}, 1234, []).
{ok,{sctp_assoc_change,comm_up,0,10,10,2}}
NodeC:
1> f(S), {ok, S} = gen_sctp:open([{ip,{192,168,0,13}}]).
{ok,#Port<0.101>}
2> f(A), {ok, A} = gen_sctp:connect(S, {192,168,0,13}, 1234, []).
{ok,{sctp_assoc_change,comm_up,0,10,10,6}}
NodeB:
3> gen_sctp:send(S, A, 3, <<"Test">>).
ok
Kenneth Flanagan wrote:
> Hello,
> I have written a very simple H.248/SCTP Media Gateway application for
> loading up our Gateway Controller. Initially I had a lot of problems
> getting SCTP working, and finally it did with Debian Linux and Erlang
> OTP R11B-5. It works fine simulating one MGW, accepting over a 1000
> calls/second, but I need to simulate multiple MGWs (to show calls
> between MGWs, and I have enough processor capacity & bandwidth to do
> it).
>
> There is only 1 network card available for SCTP, and I have multiple
> virtual interfaces. The problem is when I open another association and
> try to send data I get error "epipe". It does not matter if I open
> another erlang node, or try it on the same node. The IP addresses work
> individually, i.e. it's not the address that has the problem.
>
> I would appreciate any help/comments on this, Best Regards, Ken.
>
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