GRE through DPC3939B - Protocol 47?
I have been trying to connect a GRE tunnel between my Cisco routers and am having on luck. I have tried to research what i need to do, but all I can find are the following references:
1. forward port 1701 and 1723 from my DPC3939B directly to the router IP inside (currently 10.1.10.100)
2. forward "protocol 47" from my DPC3939B directly to the router IP inside (currently 10.1.10.100)
I have added the static port mappings for 1701 and 1723 to the internal IP Address, but I see no "protocol" options in the DPC3939B. Will I be able to set up the GRE (VPN) network through the Comcast Business gateway?
I am connecting a remote Cisco 3825 to an internal Cisco 1841 that sits behing the Comcast gateway.
Cisco 1841 -> Comcast Cisco DPC3939B -> Internet <- Comcast router <- Cisco 3825
Any suggestions would be apprecaited. I need to get this working ASAP.