[SR-Users] listening at link local IPv6 address

[Daniel-Constantin Mierla]

Can you try without hard coding the IP address there, but use the value
from the listen address? That will show if works properly with the
config based values.

As I said, the link local might be tricky to deal with on some operating
systems and are not commonly used for traffic, so having an option to
disable/enable binding to it seems appropriate here. Also, finding the
scope id requires walking though networking interfaces for all IPv6
addresses, which can be a costly at startup.

Cheers,
Daniel

On 23.04.19 07:16, Juha Heinanen wrote:
> Daniel-Constantin Mierla writes:
>
>> Anyhow, your code has hardcoded interface name, I added a helper
>> function that tries to get the scope by matching the ip address when
>> walking over network interfaces. The commit:
>>
>> https://github.com/kamailio/kamailio/commit/ce1138d2d8962296de2867d5751abf770b035da3
>>
>> Can you try using that function to get the scope id?
> I tried by changing my udp_server.c test line:
>
> 	addr->sin6.sin6_scope_id = if_nametoindex("wlp1s0");
>
> to
>
> 	addr->sin6.sin6_scope_id = addr->ipv6_get_netif_scope("fe80::6e29:95ff:fe7d:37e6");
>
> and the test again worked fine:
>
> Apr 23 08:10:41 salmon sip-proxy[21888]: Listening on
> Apr 23 08:10:41 salmon sip-proxy[21888]:   udp: FE80:0:0:0:6E29:95FF:FE7D:37E6 [FE80:0:0:0:6E29:95FF:FE7D:37E6]:5060
>
> So rather than skipping link local addresses, ipv6_get_netif_scope could
> be used to find the scope id.
>
> -- Juha

-- 
Daniel-Constantin Mierla -- www.asipto.com
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