[Freeswitch-dev] Issue around IPv6

[Tamas]

Hi,

I was looking for the strace and found that probably I was wrong with
the inference.
>From strace I see (now) that ipv4 try was OK, thus something else might
block the sip register packets.
Any idea?

Regards,
    Tamas

Tamas írta:
> Hello,
>
> My original issue was that after some time (unable to find a rule when)
> registering gateway stopped suddenly working and went to status DOWN and
> state was FAIL_WAIT.
> In the logs I saw that it was trying to register continuously, but there
> were no REGISTER packet sent out anymore. Clients registering to this
> box were able to register, just it was not able to register to the
> upstream box (FreeSWITCH too). Registering scheme:
> clients--->FS local---(NAT)--->FS public
>
> When I've caught such a case again, I was stracing FS processes and
> found this:
> stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2393, ...}) = 0
> futex(0x2ac3092ead94, 0x85 /* FUTEX_??? */, 1) = 1
> futex(0x2ac3092ead40, 0x81 /* FUTEX_??? */, 1) = 1
> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 34
> setsockopt(34, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0
> connect(34, {sa_family=AF_INET, sin_port=htons(4242),
> sin_addr=inet_addr("82.45.148.209")}, 16) = 0
> getsockname(34, {sa_family=AF_INET, sin_port=htons(32824),
> sin_addr=inet_addr("192.168.1.38")}, [1451698946064]) = 0
> close(34)                               = 0
> socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = 34
> connect(34, {sa_family=AF_INET6, sin6_port=htons(4242),
> inet_pton(AF_INET6, "2001:503:ba3e::2:30", &sin6_addr), sin6_flowinfo=0,
> sin6_scope_id=0}, 28) = -1 ENETUNREACH (Network is unreachable)
> close(34)                               = 0
> stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2393, ...}) = 0
> futex(0x2ac3092ead94, 0x85 /* FUTEX_??? */, 1) = 1
> futex(0x2ac3092ead40, 0x81 /* FUTEX_??? */, 1) = 1
>
> From this I guess, my issue relates to IPv6. That is right that the box
> has IPv6 address on the eth interface (ubuntu default), but this has
> worked for some days or some hours (varies) without this issue. So
> something might happen for which FS suddenly started using the IPv6
> interface address (which is not configured well).
>
> I've found tha given public IP (82.45.148.209) in switch_find_local_ip
> function and have found that this is a root DNS server and the role of
> this function is to find the local IP address. As I was looking for the
> source, probably something sent wrong family to this function (AF_INET6
> in place of AF_INET). Maybe this is a trivial issue for the experts...
>
> I'm sure that if I remove the ipv6 things from my system it will be OK,
> however I had similar issue on a box with no ipv6 address to. I'm not
> sure if it is the same/similar issue or not, but the symptoms looks
> similar. Unfortunately we had to restart that box (production) and since
> that the problem disappeared (that was maybe fixed - the case happened
> about 2 weeks ago).
>
> I think some users - mainly on test systems like I have - might face to
> this issue so it might be worth to take a look, why had FS suddenly
> tried to send packets on ivp6. This could be a system issue too -
> something crazy with Xen or Ubuntu?
>
> Thanks in advance!
>
> Regards,
>     Tamas
>
> ps: FreeSwitch Version 1.0.trunk (10567M)
> Ubuntu Hoary (8.04) under Xen
>
>