[strongSwan] ike_sa_init on port 4500

[tsaitgaist]

Hi,

I try to configure an IPsec client using strongswan.
I don't know the IPsec server, but I know the connection details.
But the server only listens to port 4500
Normally strongswan sends the ike_sa_init on port 500 and then switches
to port 4500.
Is it possible to make strongswan send message 1 ike_sa_init on port
4500 instead of 500 ?
I couldn't make it work using /rightprotoport, /nat_traversal, mobike or
keyexchange
It does not even need to add the additional zeros as described in
http://tools.ietf.org/html/draft-eronen-ipsec-ikev2-clarifications-02#section-6.7

thanks,
tsaitgaist
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