Hi SK,

just upgrade to the latest strongSwan 5.3.0 stable release which
introduces make-before-break reauthentication for the charon daemon.

Best regards

Andreas

On 13.04.2015 23:48, SM K wrote:
Hi All,

I am seeing a problem with a cisco891 connected to strongswan 5.1.3
using IKEv1. It seems like a cisco problem, but i did not see this
problem with strongswan 4.x matbe because the older strongswan handled
it a different way.

I notice the problem when the cisco attempts reauthentication of phase1.
It seems that the existing phase1 is first down-ed before the new one is
created. In most other firewalls, i see that a new phase1 is created
before the old one is killed.

The problem with how the cisco891 does this is that when phase1 that is
being reauthenticated is deleted, the phase2s are also killed on
strongswan. But these phase2 still exist on the cisco and it is actively
sending data on this. When the new phase1 is created, strongswan
ofcourse does have any phase2s to adopt. So we have the cisco
out-of-sync with strongswan. Is there anyway to workaround this in
strongswan?

I also noticed that when the child SAs are killed when a phase1 goes
down, it does not send a delete message to the other side. Shouldn't the
full delete process for the child SA be followed so that the other side
also deletes its phases2s?

thanx in advance,
SK




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Andreas Steffen                         [email protected]
strongSwan - the Open Source VPN Solution!          www.strongswan.org
Institute for Internet Technologies and Applications
University of Applied Sciences Rapperswil
CH-8640 Rapperswil (Switzerland)
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