Re: NAT-PMP not honoring requested external port
Re: NAT-PMP not honoring requested external port
- Subject: Re: NAT-PMP not honoring requested external port
- From: james woodyatt <email@hidden>
- Date: Mon, 9 Jun 2008 18:00:00 -0700
On Jun 9, 2008, at 17:43, Jens Alfke wrote:
What I expected to happen is that peer sees an incoming connection
from [ABS public address], port PUB. I.e. the ABS does the same PRIV-
>PUB port mapping for the outgoing connection.
Instead, the peer sees a random port number. Is that the expected
behavior? (The NAT-PMP spec doesn't seem to address this.)
It sounds like you're trying to establish a hairpinned connection
through the NAT-PMP mapped port. Some routers support this operating
mode with redirected public ports. AirPort does. The source port and
private address are floated in the hairpin. Older AirPort models will
float the source address to the public IP address of the AirPort.
Newer models float the source address to the private IP address of the
AirPort.
--
james woodyatt <email@hidden>
member of technical staff, communications engineering
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