NTP and VPN's

Unanswered Question
Apr 7th, 2008

I have a pix 525 ver 7.0(4) with about 30 VPN's currently running on it at any particular time.

Currently the Pix is not synchronized to the ntp server (it's about 45 minutes out).

This is due to an incorrect route on the pix.

when I resolve the incorrect route issue

and the ntp synchronizes - will it affect any VPN's that are currently connected.

I have this problem too.
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Richard Burts Tue, 04/08/2008 - 09:16

Ian

I can not think of a reason why the sync of NTP would impact the VPNs that are currently connected.

HTH

Rick

sundar.palaniappan Tue, 04/08/2008 - 15:05

Rick,

I assume he might be using digital certificates for VPN authentication and that probably could be his concern about the NTP time change.

Ian,

The existing VPN connections shouldn't be affected by NTP clock synchronization. Even the new connections mightn't be affected much as the time difference was only 45 minutes earlier anyway.

HTH

Sundar

IanCatchpole Wed, 04/09/2008 - 01:07

Sundar,

Thanks for your response .

We're using shared secret passwords for the tunnels.

So the ntp changing the clock won't affect the timers on the VPN ??

sundar.palaniappan Wed, 04/09/2008 - 09:38

In that case NTP should have nothing to do with your VPN connection. You should be OK.

HTH

Sundar

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