RE: Callee behind NAT

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Hi Simon,

> NAT Traversal Strategies (require help from NAT box or external helper)
> Port forward               supported    proxy.

In most cases, proxy is not required.  I have a system running
ProxyForNAT=0, with ATA-186, Cisco 827, and Planet VIP-400 EPs
behind dumb NATs, using only port forwarding.  UPnP, STUN, or
gnugk awareness is not required.  Incoming and outgoing
both work fine, including calls from one NATed EP to another.

This works because an EP sends its private address and RPT port
in OLC/OLCack, which gnugk replaces with the public IP when it
sends it to the other EP.  The port number is unchanged, so the
RTP packets go to the NAT box, on the right port to be properly
forwarded to the EP.

The only problem with this scheme is that ProxyForNAT is a global
setting.  It would be nice if it could be enabled on a per-endpoint
basis, so that proxy would still be available if a few endpoints
really need it.

--Stewart





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