[Blink] Fwd: sip: dns queries

Hendrik Schweppe hendrik.schweppe at eurecom.fr
Tue Jun 15 17:23:42 CEST 2010


Hi,

can you make sense of outgoing DNS packets? Why are they there: most firewalls would not allow
them to pass through (and that's the problem for me right now).

Did anyone have this issue so far?

Thanks,
Hendrik

Begin forwarded message:

> Date: June 10, 2010 2:21:26 PM GMT+02:00
> Subject: sip: dns queries
> 
> hi adrian,
> 
> i'm just debugging some firewall problems with the it service here (...)
> 
> i see that blink (in contrast to xlite, e.g.) emits dns packets to the registrar *directly* and does not
> use the dns service from resolv.conf. that is blocked by many firewalls (i.e. you're forced to use the
> own/internal dns service).
> 
> is that wanted/known and is there a specific reason for it?
> 
> just curious.
> best,
> hendrik
> 
> 
> 14:16:41.107269 IP 192.168.21.180.60621 > 217.10.66.66.53: 46947+ NAPTR? sipgate.de. (28)
> 14:16:42.481703 IP 192.168.21.180.51943 > 194.242.114.183.53: 7342+ NAPTR? voip.wengo.fr. (31)
> 14:16:44.107859 IP 192.168.21.180.50952 > 217.10.64.99.53: 46947+ NAPTR? sipgate.de. (28)
> 14:16:45.482240 IP 192.168.21.180.58354 > 193.200.4.245.53: 7342+ NAPTR? voip.wengo.fr. (31)
> 14:16:47.309022 IP 192.168.21.180.59070 > 217.10.66.66.53: 46947+ NAPTR? sipgate.de. (28)
> 14:16:47.576803 IP 192.168.21.180.58689 > 192.168.21.255.11111: UDP, length 8
> 

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