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POSCTP multi-homing not working as expected
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copied!<p>I'm facing a problem in implementing multi-homing in SCTP as the server side. The server has 2 IPs it is listening to. I'm almost there, but there are 2 problems:</p> <ol> <li>First IP returns the INIT-ACK with 2 different IPs inside the header as it should but the other IP return twice the same IP in the INIT-ACK header.</li> <li>Seems like I’m not supporting 100 % in multi-homing, for example, if one of the links is down I don’t see a fail over.</li> </ol> <p>So I don’t know if except the setsockopt with the option SCTP_SOCKOPT_BINDX_ADD I need anything else (maybe SCTP_PRIMARY_ADDR?) or what is wrong in my implementation.</p> <p>Following is the code, I enter this code twice, first time I do bind and then save the socket and the first address, second time again bind (for the second IP) and then running setsockopt for both of the addresses and sockets.</p> <pre><code> bind(socket, &sock_addr.addr.sock_addr, sock_addr_len); if(SHARED.num_used_entries_in_sockaddr_array == 0) { SHARED.saved_socket = socket; SHARED.sockaddr_array[1] = sock_addr.addr.sock_addr; } else { SHARED.sockaddr_array[0] = sock_addr.addr.sock_addr; } if(SHARED.num_used_entries_in_sockaddr_array > 0) { sock_rc = setsockopt(SHARED.saved_socket, IPPROTO_SCTP, SCTP_SOCKOPT_BINDX_ADD, (char*)SHARED.sockaddr_array, sizeof(SCKOS_SOCK_ADDR)); sock_rc = setsockopt(socket, IPPROTO_SCTP, SCTP_SOCKOPT_BINDX_ADD, (char*)SHARED.sockaddr_array, sizeof(SCKOS_SOCK_ADDR)); } SHARED.num_used_entries_in_sockaddr_array++; </code></pre> <p>Thanks!!!</p>

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