Palo-Cisco VPN Logs

[welly_59]

Im setting up a s2s vpn between a Palo and a Cisco ASR. The GUI is showing it all as up - green lights and ike tunnels. But the logs are showing the below:

IKEv2 child SA negotiation is failed message lacks KE payload

I am not sending traffic down the vpn yet so i am unable to ascertain if this is important message or not (would rather know it works before i tell my boss it is working!)

[BPry]

@welly_59,

Cisco won't really bring up the tunnel on its end until you have interested traffic attempting to navigate the tunnel. 

[welly_59]

So if I get on a device within my subnet specified in the proxy-I’d and generate some traffic the message logs should change?

[BPry]

@welly_59,

Exactly. With interesting traffic the Cisco device will actually attempt to fully bring up the tunnel. 

[welly_59]

I’ve looked a bit deeper into this. Run a pcap while restarting the vpn, and then looking at active sa’s on the cli. The child sa’s matching the proxy ids are up and seem to be fine.

This weird message regarding no ke message is for a third child sa initiated by the Cisco device. Might be a issue with the crypto map their side

[welly_59 · Accepted solution]

Got to the bottom of this. The Cisco was actually using a route-based VPN. I had been expecting a policy-based VPN so had configured Proxy-ID's on the Palo Alto.

I have removed the Proxy-ID's from the config and the tunnel; has stayed up but the log errors have stopped