UDP nat question
fla at inescporto.pt
Wed Apr 20 18:11:49 CEST 2005
First of all, thanks for replying, it's clear now.
I have one more question related to this:
Imagine a host behind NAT with IP 192.168.22.33 which has an application
on port 5060 ( a sip client) and opens a connection to a server outside
the NAT (the sip registrar with IP 126.96.36.199 on port 5060), and
consider that the NAT box translates the SIP client src_ip to
188.8.131.52 and src_prt to 5054, for this communication.
The SIP registrar is able to reach the SIP client running on
192.168.22.33:5060 by using 184.108.40.206:5054, but what about other
hosts on the Internet? Will they also be able to reach the SIP client
using the pair 220.127.116.11:5054, or only packets coming from the SIP
registrar be accepted?
Filipe Lameiro Abrantes
Campus da FEUP
Rua Dr. Roberto Frias, 378
Phone: +351 22 209 4266
E-mail: fla at inescporto.pt
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