From: Tim (ccie2be@nyc.rr.com)
Date: Sun Nov 12 2006 - 11:07:41 ART
Hey Richard,
How ya doing?
Thanks for our quick response.
Actually, the lifetimes can be different on the 2 peers - at least with
Cisco's implementation. The smaller lifetime wins.
But, that's a different issue than what I was wondering about.
My concern was with respect to the phase 1 versus phase 2 lifetimes on a
given peer.
So, let's say we're configuring Peer 1 and we configure this:
Peer 1
Phase 1 (ISAKMP)
SA lifetime....X
Phase 2 (IPSec)
SA lifetime....Y
Should X be equal to, bigger than or smaller than Y?
Does it matter? Why or why not?
Is there a "Best Practice" when it comes to this?
Thanks again,
Tim
-----Original Message-----
From: Richard Dumoulin [mailto:Richard.Dumoulin@vanco.fr]
Sent: Sunday, November 12, 2006 8:56 AM
To: Tim; security@groupstudy.com; ccielab@groupstudy.com
Subject: RE : vpn -- SA lifetime
Phase 2 sa lifetimes need to be equal I believe at oth sides.
However Phase 1 sa lifetime of the initiator needs to be smaller than the
one of the server.
-- Richard
-----Message d'origine-----
De : nobody@groupstudy.com [mailto:nobody@groupstudy.com] De la part de Tim
Envoyi : Sunday, November 12, 2006 1:57 PM
@ : security@groupstudy.com; ccielab@groupstudy.com
Objet : vpn -- SA lifetime
Hi guys,
Lifetimes, for both the mgmt SA (ISAKMP) and the data SA's (IPSec), can be
configured independently.
That being the case, does it matter what the values are relative to one
another?
IOW, should the lifetime for the mgmt SA be equal to, smaller than or larger
than the data lifetime?
Is there a "Best Practice" when it comes to selecting these values?
I know the lifetime parameter can be left at its default value but I'd like
to know if one value is changed, should the other value also be changed and
how to think about this issue.
Thanks very much for any feedback on this.
Tim
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