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Re: [SCTP-Discussion] multihoming problem


Chronological Thread 
  • From: Michael Tüxen <Michael.Tuexen AT micmac.franken.de>
  • To: Prasanth Pillai <prasanth1103 AT gmail.com>
  • Cc: sctp-discussion AT sctp.de, vinod.singh.ext AT nsn.com
  • Subject: Re: [SCTP-Discussion] multihoming problem
  • Date: Wed, 18 Aug 2010 15:50:45 +0200
  • List-archive: <http://lists.franken.de/pipermail/sctp-discussion>
  • List-id: SCTP Discussions <sctp-discussion.sctp.de>

On Aug 18, 2010, at 2:59 PM, Prasanth Pillai wrote:

> Hi all,
>
> I am planning to use multihoming feature in my sctp server. Both my server
> and client
> machines are configured with multiple ip addresses on different interfaces.
> I am able to
> see multiple ip addresses getting passed in init ack through tcpdump. The
> data flows
> fine through one of the interaces, untill the interface goes down (I
> removed the network
> cable manually). When the interface goes down , the server is not able to
> receive the
> data through the other interface. I am able to see the data coming to the
> other interface
> ip in tcpdump, as soon as the interface is down. But my server is not able
> to receive it.
>
> server code (system calls only)
> socket (AF_INET, SOCK_STREAM, IPPROTO_SCTP)
>
> bind(listen_sctp_fd, (struct sockaddr *) &sctpser, sizeof (sctpser))) //
> server first interface ip
>
> sctp_bindx(listen_sctp_fd, (struct sockaddr *) addresses, count,
> SCTP_BINDX_ADD_ADDR)) // second interface ip
>
> listen(listen_sctp_fd, 5)
>
> id = accept(listen_sctp_fd, (struct sockaddr *) &peer_info, (socklen_t *)
> & peer_info_len))
>
> sctp_recvmsg( client_fd, (void *) buffer, sizeof (buffer), (struct sockaddr
> *) NULL, 0, &srInfo, &flags))
>
> client code (system calls only)
>
> socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP);
>
> sctp_connectx(sock_fd, (struct sockaddr *) addresses, 2);
>
> sctp_sendmsg(sock_fd, (void *) buffer, strlen(buffer) + 1, NULL, 0, 0, 0,
> 0, 0, 0);
>
> Can someone help me, why my code is not working? Is there anything missing
> in my code?
>
>
> Waiting for your valuable comments.
> Prasanth
Hi Prasanth,

what OS are you using? What SCTP implementation are you using?

Best regards
Michael
>
>
>
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