On 01/07/2018 09:48 AM, Tom Eastep wrote:

>>
>> Libreswan is supposed to automatically handle DNAT-T and clearly it does
>> as it works when not changing ports.  And changing ports in this way
>> should not be visible to it unless there's some damage in the
>> decapsulation process.
>>
> 
> There is no encapsulation going on at this point, but I have also
> confirmed that it doesn't work. I can only assure you that this isn't a
> Shorewall issue, as there are no options to the iptables DNAT target
> that are remotely relevant to this problem.
> 

I don't know about Libreswan, but Strongswan has options to change the
IKE and NAT-T ports (charon.port and charon.port_nat_5 respectively).

-Tom
-- 
Tom Eastep        \   Q: What do you get when you cross a mobster with
Shoreline,         \     an international standard?
Washington, USA     \ A: Someone who makes you an offer you can't
http://shorewall.org \   understand
                      \_______________________________________________

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