Charles Steinkuehler wrote:

>
> This could be caused by routing issues, firewall issues (make sure you're
> allowing protocols 50/51 as well as UDP port 500, which sets up the SA),
> configuration issues (it can be tricky to understand how IPSec interacts
> with standard routing on linux).
>

And NAT traversal also typically uses UDP port 4500. The UDP 500 and
protocol 50/51 packets are encapsulated inside UDP packets with
destination port 4500.

-Tom
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Tom Eastep    \ Nothing is foolproof to a sufficiently talented fool
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