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Hi, you have to bind the specific IP address to the specific interface:
Best regards Franz Von: pjsip <pjsip-bounces@xxxxxxxxxxxxxxx> im Auftrag von Bui Quy <quybd@xxxxxxxxxxxx>
Gesendet: Freitag, 21. Februar 2020 11:13 An: pjsip@xxxxxxxxxxxxxxx Betreff: PJSUA with two NICs Hi,
I would like to set up a system like below: (172.36.100.11) (172.36.100.12) enp1s0 ----------------------------------- enp1s0 PC 1 ------ | |------------ PC 2 enp2s0 ----------------------------------- enp2s0 (172.36.101.11) (172.36.101.12) I can make a call from PC1 to PC2 via enp2s0 interface (172.36.101.11), but all the RTP packets are always going through enp1s0 (172.36.100.11) not enp2s0 (172.36.101.11). How can I make those RTP packets go through the enp2s0 interface? I follow this site to config two default gateway: https://www.thomas-krenn.com/en/wiki/Two_Default_Gateways_on_One_System On PC1: route -n Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 172.36.100.1 0.0.0.0 UG 0 0 0 enp1s0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 enp1s0 172.36.100.0 0.0.0.0 255.255.255.0 U 0 0 0 enp1s0 172.36.101.0 0.0.0.0 255.255.255.0 U 0 0 0 enp2s0 ip route list table rt2 default via 172.36.101.1 dev enp2s0 172.36.101.0/24 dev enp2s0 scope link src 172.36.101.12 ip rule show 0: from all lookup local 32764: from all to 172.36.101.12/24 lookup rt2 32765: from 172.36.101.12/24 lookup rt2 32766: from all lookup main 32767: from all lookup default When I make a call from PC1 to PC2 via enp2s0, this is the INVITE message: Internet Protocol Version 4, Src: 172.36.101.11, Dst: 172.36.101.12 User Datagram Protocol, Src Port: 4321, Dst Port: 1234 Session Initiation Protocol (INVITE) Request-Line: INVITE sip:172.36.101.12:1234 SIP/2.0 Message Header Via: SIP/2.0/UDP 172.36.100.11:4321;rport;branch=z9hG4bKPjXPf3YS3e4e6gZ0m4z.oDyeO0KNHwknAE Max-Forwards: 70 From: <sip:172.36.100.11>;tag=Fd18S4-WSwPB3bxA7.QstNy.GomS4lSO To: sip:172.36.101.246 Contact: <sip:172.36.101.11:4321;ob> Call-ID: MTqhGS7DmAfQxEvZSlH9gpf3be.UycnQ [Generated Call-ID: MTqhGS7DmAfQxEvZSlH9gpf3be.UycnQ] CSeq: 16789 INVITE Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS Supported: replaces, 100rel, timer, norefersub Session-Expires: 1800 Min-SE: 90 Content-Type: application/sdp Content-Length: 476 Message Body As you can observe, my enp1s0 address (172.36.100.11) is in the Via and From headers. I can force those headers to use enp2s0 address (172.36.101.11) by adding this line at the end of pj_gethostip() function: PJ_DEF(pj_status_t) pj_gethostip(int af, pj_sockaddr *addr) { .... .... pj_sockaddr_copy_addr(addr, &cand_addr[selected_cand]); TRACE_((THIS_FILE, "Candidate %s selected", pj_sockaddr_print(addr, strip, sizeof(strip), 0))); } addr->ipv4.sin_addr.s_addr = inet_addr("172.36.101.11"); return PJ_SUCCESS; } But even after that, all the RTP packets still going through enp1s0. Any advice would be most welcome!
Best Regards,
=============================================================== Quy Bui Danh (Mr.) |
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