[Serusers] IPv6, problems with link local

[Jan Janak]

If you look in your logs you will find something like this:

Jan 19 22:09:26 localhost ser[10071]: ERROR: udp_init: bind(3, 0x80d2f20, 28) on FE80:0:0:0:202:2DFF:FE5B:E76: Invalid argument 
Jan 19 22:09:26 localhost ser[10071]: ERROR: udp_init: might be caused by using a link  local address, try site local or global

SER cannot bind a link-local IPv6 address, because just the address
itself does not contain enough information for the kernel to find out
the interface to be used.

link-local addresses are configured automatically by the kernel. The
configuration is stateless -- link-local addresses are derived from the
MAC address of the network interface. Therefore there is nothing like
common subnet which all the devices on the same link could share and
the kernel cannot derive the outgoing interface based on the
destination address of the packet and routing table.

One would need to specify the interface to be used, but that is
currently not supported by ser, also the support in glibc for this is
problematic (not supported till 2.2, if I remember correctly).

  Jan.

On 13-01 12:41, Michelle Mendel wrote:
> 
>    Hi,
> 
> 
> 
>    I am developing some SIP on IPv6 test tools and run them against the
>    SER 0.8.12 on a SUSE LINUX 9.0 machine.
> 
> 
> 
>    Everything works fine with global IPv6 addresses. However, when I test
>    IPv6 link local addresses the SER refuses to start (all the PCs
>    involved are on the same link).
> 
> 
> 
>    I modified my ser.cfg to listen on the link local address (disabling
>    the global IPv6 address):
> 
> 
> 
>    ...
>    listen=fe80::20a:5eff:fe40:72d2
>    ...
> 
> 
> 
>    After restarting the SER it displays listening on the fe80 address,
>    but there are no SER processes at all (i.e. serctl ps r! eturns
>    empty).
> 
> 
> 
>    Maybe do I have to add something like a scope ID to the fe80 address?
>    Or aren't the link local addresses supported at all on the SER?
> 
> 
> 
>    Many greetings,
> 
> 
> 
>    Matze
> 
>    Verschicken Sie romantische, coole und witzige Bilder per SMS!
>    Jetzt bei WEB.DE FreeMail: [1]http://f.web.de/?mc=021193
> 
> References
> 
>    1. http://f.web.de/?mc=021193

> _______________________________________________
> Serusers mailing list
> serusers at lists.iptel.org
> http://lists.iptel.org/mailman/listinfo/serusers