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hi,
i am new to the list and did already a search about
the NAT Q&A but couldn´t find an answer for my problem right
now.
we use videophones with the gnugk which works
really pretty fine except some problems with several NAT
Routers.
the most problem we have is that the phone can
connect the outside gk with public ip and register correctly but at the channel setup the reply IP is setup as an private IP.
isn´t there a way to rewrite the IP at the
channel setup to the correct IP, because the gk already knows the real IP of the
phone behind the NAT (from registration) and the private IP´s are also well
known. (i know that many SIP Provider will do this to establish connections with
broken NATs)
i guess that some broken NAT routers try to rewrite
the IP address at translation but don´t do it the right way or as deep as it is
necessary for H.323.
e.g.
any phone or also a child gk behind a draytek vigor
2200X register with the public IP instead of the private IP at registration.
gnugk states a NAT=0 (did s.b. know what are the
different NAT Types?) at the gk.log file with -ttttt
i assume that gnugk guess that the phone is without
NAT or that there is no translation necessary.
as an result at the channel setup the reply IP of
the phone behind the draytek router is an private IP which couldn´t obviously
work.
it did not matter if i use dmz or portforwarding
the result is always the same, the other side can here and see me but i can´t
nothing receive at my side.
i could expand the list to some more routers
e.g. some zyxel, dlink, netgear, devolo etc.this is because of the upcomming and
at the moment mainstream broadband connections over ADSL with one dynamic IP
(and a disconnection every 24h) not really a fortune.
also setting up a proxy gk as a child gk behind
such a NAT router will bring some improvements.
(can i force the child (proxy) gk to be a NATed
Endpoint?
could STUN which is already included in the
openh323 protocol bring some improvment? Any hints are warmest welcome
:-)
thx in advance
TOM
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