Yahoo and MSN messenger problem

Daniel Lopes lopsch at
Fri Apr 1 15:41:23 CEST 2005

wlagmay at schrieb:
> Hi all,
> Im using Iptables for routing, redirection and Network Address Translation
> (SNAT), everything is working fine execpt for yahoo and MSN voice chat. I found
> out that there seems to a problem with SNAT, I cannot use masquerading, I know
> that voice chat will work on masquerading but my requirement is many to many
> IP.
> Is ther any solution on this issue? I need many local IP address to be converted
> to many public IP addresses dynamically.
> Any information is surely a big help, thank you very much,
> wennie
AFAIK MSN sends informations like the local IP-address within the 
payload of the voice chat request and therefor also MASQ will not work. 
I don´t know exactly if it is based on h.323 if so perhaps the conntrack 
module for h.323 helps. If not the possibilities are a working conntrack 
module for these protocols, a UPnP aware router take a look at or perhaps a proxy server on 
the router. Got the similar problems here but didn´t have the time to 
the opportunities.

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