[strongSwan] disregarded diffie hellmann group

Tobias Brunner tobias at strongswan.org
Wed Jun 3 15:45:33 CEST 2020

Hi Marco,

> It looks like the other peer (which should be a checkpoint) when acting
> as a responder claim the dhgroup. Instead when acting as initiator is
> going to drop the dh group request.

You didn't clarify if that happens during a CHILD_SA initiation with
IKE_AUTH or with CREATE_CHILD_SA.  During IKE_AUTH, the DH group is
always omitted, so it really shouldn't matter who is initiator (and
removing the DH group from the proposal doesn't make a difference).
However, during CREATE_CHILD_SA DH is optional.  But enforcing a DH
group as responder and not proposing one as initiator of the same
CHILD_SA doesn't really make sense.  So if that's the case, it sounds
like a bug.


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