We are having problems with a site to site IPSEC VPN between a PA-500 and a Cisco ASA. The PA is always the initiator and the tunnel comes up and passes traffic just fine. The problem comes when the tunnel needs to rekey, basically it seems that the PA does not bother to renegotiate until between 30 and 120 seconds of the lifetime remains. Now this is fine if the lifetime is 10 minutes or less but in reality it works out that with a sensible lifetime in place the Cisco has dropped the Phase 2 tunnel (at 95% of the lifetime) long before the PA tries to rekey.
When the lifetime is set to a short time (12 minutes) the PA log shows either side initiating the negotiation depending on whether the PA has done it by 95% of lifetime or not. When the lifetime is longer the PA does not log any attempt by the ASA to initiate the negotiation - it seems almost as if it ignores any attempt to rekey if it falls outside of its window.
Can anyone confirm what the Palo Alto policy is regarding IPSEC phase 2 tunnel rekey? Is anyone else having this problem?
The best advice I can give is make sure your timeout values are identical on both devices. If you have say 8 hours on the PAN make sure its 8 hours on the Cisco. I think Cisco uses seconds so there may be some math involved. But make sure the phase 1 and 2 setting sare identical on both sides. I have VPNs from my PAN's tothe following other types of VPNs and they are all functional:
McAfee Next Gen Firewall
All phases have to match otherwise you may not even establish in the first place. So if you change one side, you have to change the other.
Hope this helps.
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