Thanks. This is a network capture taken on Kamailio server that showing VSS Monitoring ethernet. --- This is not a LAN network. UAC is on Internet behind a NAT device so I can't capture the traffic in the network.
According your message, you think UAC send close notify alerts even during during the call establishment? Regards Abdoul. 2017-04-05 14:58 GMT+02:00 Nathan Ward <kamailio-sr-us...@daork.net>: > > On 6/04/2017, at 12:25 AM, Abdoul Osséni <abdoul.oss...@gmail.com> wrote: > I have always this issue with NAT devices using VSS-Monitoring protocol. > > A network capture shows: > - Kamailio sends a tcp keepalive > - The NAT device sends a tck keepalive ACK to Kamailio with a new filed : > vss-monitoring > Frame 70: 62 bytes on wire (496 bits), 62 bytes captured (496 bits) > Linux cooked capture > Internet Protocol Version 4, Src: x.x.x.x, Dst: x.x.x.x > Transmission Control Protocol, Src Port: 13178, Dst Port: 443, Seq: 2752, > Ack: 6214, Len: 0 > *VSS-Monitoring ethernet trailer, Source Port: 0* > * Src Port: 0* > > > Hi, > > VSS-Monitoring is a function of your monitoring tap, is is not a function > of your NAT box - http://www.vssmonitoring.com/resources/feature-brief/ > Port-and-Time-Stamping.pdf > It should not be included in the actual traffic packets going past the tap > - only the packets that you see on your network analyser - if you find that > it is included on actual packets, you need to talk to your networking > people and get that fixed. > > It is very unlikely that a NAT device sends anything other than > synthesised RST packets. It certainly won’t be generating close notify TLS > alerts - I’m not actually sure that it can, they might need to be > authenticated. > > If you are seeing a close notify, you should capture between the UAC and > the NAT device - I believe you will see the close notify TLS alert coming > from the UAC. If that is the case, you need to look at the UAC for why it’s > doing that. Perhaps your UAC does not support TCP keepalives properly. > > -- > Nathan Ward > > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users@lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > >
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