Hello list,
in a bridging scenario with kamailio 3.3.4 and rtpproxy 1.2.1 for bridging signalling and media from an IPv4 to an IPv6 network and vice versa I found that the TOS value, which is set in kamailio.cfg, is used for IPv4 packets only. IPv6 packets have the traffic class value set to the default value 0x0. In other words: kamailio doesn´t use this variable for IPv6 packets. In the cookbook (http://www.kamailio.org/wiki/cookbooks/3.3.x/core#tos) I haven´t found any hint that it _is_ limited to IPv4 only ("...for the sent IP packages").
I know that the name "tos" may be misleading, as the original definition was outdated by dscp+ecn, but it was/is working fine now. However, as IPv6 is using dscp+ecn, too, I wonder if the tos variable should support IPv6 packets, too.
Could anybody give me a hint? Is there maybe an alternative way to prioritise SIP in IPv6 with kamailio?
Thanks in advance, Klaus Feichtinger
Hello,
On 3/22/13 9:50 PM, Klaus Feichtinger wrote:
Hello list,
in a bridging scenario with kamailio 3.3.4 and rtpproxy 1.2.1 for bridging signalling and media from an IPv4 to an IPv6 network and vice versa I found that the TOS value, which is set in kamailio.cfg, is used for IPv4 packets only. IPv6 packets have the traffic class value set to the default value 0x0. In other words: kamailio doesn´t use this variable for IPv6 packets. In the cookbook (http://www.kamailio.org/wiki/cookbooks/3.3.x/core#tos) I haven´t found any hint that it _is_ limited to IPv4 only ("...for the sent IP packages").
I know that the name "tos" may be misleading, as the original definition was outdated by dscp+ecn, but it was/is working fine now. However, as IPv6 is using dscp+ecn, too, I wonder if the tos variable should support IPv6 packets, too.
Could anybody give me a hint? Is there maybe an alternative way to prioritise SIP in IPv6 with kamailio?
Probably when it was added the IPv6 was no longer in the spot and developer didn't bother with it. If it uses more or less same interface to set it, then I guess it will not be hard to extend it to IPv6. Just add it to the tracker to be visible and not to get forgotten.
Cheers, Daniel
Hello,
there is a patch attempting to set the tos for IPv6: - http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=084be456...
For now is only for UDP, but if it works I will propagate to tcp/tls.
I tested it compiles, but had no IPv6 testbed around. If anyone can test and report back, will be appreciated.
Cheers, Daniel
On 3/25/13 1:40 PM, Daniel-Constantin Mierla wrote:
Hello,
On 3/22/13 9:50 PM, Klaus Feichtinger wrote:
Hello list,
in a bridging scenario with kamailio 3.3.4 and rtpproxy 1.2.1 for bridging signalling and media from an IPv4 to an IPv6 network and vice versa I found that the TOS value, which is set in kamailio.cfg, is used for IPv4 packets only. IPv6 packets have the traffic class value set to the default value 0x0. In other words: kamailio doesn´t use this variable for IPv6 packets. In the cookbook (http://www.kamailio.org/wiki/cookbooks/3.3.x/core#tos) I haven´t found any hint that it _is_ limited to IPv4 only ("...for the sent IP packages").
I know that the name "tos" may be misleading, as the original definition was outdated by dscp+ecn, but it was/is working fine now. However, as IPv6 is using dscp+ecn, too, I wonder if the tos variable should support IPv6 packets, too.
Could anybody give me a hint? Is there maybe an alternative way to prioritise SIP in IPv6 with kamailio?
Probably when it was added the IPv6 was no longer in the spot and developer didn't bother with it. If it uses more or less same interface to set it, then I guess it will not be hard to extend it to IPv6. Just add it to the tracker to be visible and not to get forgotten.
Cheers, Daniel
Hello Daniel,
I´ve done a test with your patch now and it is working fine. IPv4 and IPv6 packets are marked with the same DSCP values (as expected) as configured with the tos parameter.
Please propagate to tcp/tls and I will do a deeper test (with more scenarios) with it. It would be nice to port it back to 3.3.x (which is currently in use), too.
Thanks a lot and best regards, Klaus Feichtinger
Hello,
there is a patch attempting to set the tos for IPv6:
http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=084be456...
For now is only for UDP, but if it works I will propagate to tcp/tls.
I tested it compiles, but had no IPv6 testbed around. If anyone can test and report back, will be appreciated.
Cheers, Daniel
-
Daniel-Constantin Mierla -
Klaus Feichtinger