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Cisco1803 - cant ping etc locally, can when VPN (NOOB warning)

Hi All

We have a Cisco 1803 and its been working without issue for years.

Recently it has started having some issues, which a reboot fixes.

It will be working fine, and suddenly drop off the face of the LAN.

I cant ping/connect to etc.

If i connect from externally via VPN i get a connection etc, and i can ping the local IP of the Cisco box.

But i can not ping/connect to any of the other resources on the network.

Im a little Confused!

The Cisco is a 2nd gateway on our LAN, part of the same subnet, with rules to pass traffic thru as needed etc.

it seems to have started happening when we noticed it was having issues connecting to websites via the SDL connection on the Cisco box.

Changed some DNS Ip's, no joy, put back to normal from a prev backup config.