vpn dropping

miller806 · 11-02-2023 07:17 PM

I have created a vpn tunnel, and it works, but after some time, the tunnels go down.

Even after I reset the tunnel on the remote side, the tunnels do not come back online.

Any suggestions would be greatly appreciated.

From the GCP side, settings are very limited.

moe54

Hello,

Without relevant logs, it is difficult to troubleshoot. However there could be a timing issue renegotiating the Child SA for Phase 2. According to our public documents (which are present at [1] under references), the Phase 2 lifetime should be 3 hours.

On-premises device must be configured according to our documents [1].

For VPNs using strongSwan, the option is rekeymargin.

For Cisco IOS 11.3+, use the below command:

set crypto ipsec security-association lifetime <seconds>

For JunOS, use the below command:

set security ike proposal lifetime-seconds <seconds>

References:

[1] https://cloud.google.com/network-connectivity/docs/vpn/concepts/supported-ike-ciphers