[SR-Users] listening at link local IPv6 address

Sergey Safarov s.safarov at gmail.com
Tue Apr 23 20:09:58 CEST 2019


also one example of same IPv6 addresses
fe80::1:2:3:4 and fe80::1:02:003:0004

On Tue, Apr 23, 2019 at 9:01 PM Juha Heinanen <jh at tutpro.com> wrote:

> Daniel-Constantin Mierla writes:
>
> > 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.
>
> I tried like this:
>
>   addr->sin6.sin6_scope_id =
>     ipv6_get_netif_scope(sock_info->address_str.s);
>
> and it failed:
>
> Apr 23 20:45:12 salmon /usr/bin/sip-proxy[12701]: ERROR: <core>
> [core/udp_server.c:400]: udp_init(): bind(8, 0x7f88340f6fe4, 28) on
> FE80:0:0:0:6E29:95FF:FE7D:37E6: Invalid argument
>
> Then I went and tried all these:
>
>                 addr->sin6.sin6_scope_id =
> //                      ipv6_get_netif_scope(sock_info->address_str.s);
> //                      ipv6_get_netif_scope("fe80::6e29:95ff:fe7d:37e6");
> //
> ipv6_get_netif_scope("fe80:0:0:0:6e29:95ff:fe7d:37e6");
>                         ipv6_get_netif_scope("fe80::6e29:95ff:fe7d:37e6");
> //                      ipv6_get_netif_scope("FE80::6E29:95FF:FE7D:37E6");
>
> The only version that worked is the one not commented out.  So the
> address needs to be exactly as shown by 'ip addr':
>
> 2: wlp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
> group default qlen 1000
>     link/ether 6c:29:95:7d:37:e6 brd ff:ff:ff:ff:ff:ff
>     inet 192.168.43.98/24 brd 192.168.43.255 scope global wlp1s0
>        valid_lft forever preferred_lft forever
>     inet6 fe80::6e29:95ff:fe7d:37e6/64 scope link
>        valid_lft forever preferred_lft forever
>
> i.e., same case and omitting of zero fields.
>
> It would be better to use the name of the interface (in above wlp1s0)
> with call if_nametoindex(ifname).  Is the name available?
>
> -- Juha
>
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