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COMCAST Workplace Setup with Linksys BEFVP41 VPN End Points

Medium Priority
Last Modified: 2008-02-20

I have been doing successful VPN processing for years on Linksys routers such as BEFVP41 with tunnels connected to clients running SSH Sentinel software.  Now COMCAST has started using SMC8013WG modem/routers for Business Workplace customers.  I am trying to connect my Linksys BEFVP41 VPN router, which worked for years with the traditional COMCAST Motorola cable modem, to this new setup.  I was also successfully using DynDns.org to publish the WAN IP.

To try to adapt to this new situation, I wired the 2 routers together and changed the internal IP of the SMC8013 to be instead of  The DHCP for the SMC8013 has a range of to  I gave the Linksys an address of and turned off DHCP on it.  The local network of 3 stations and a Win2003 Small Business Server are working fine for all LAN functions and they can all access the Internet.  The only problem are the VPN's which this company has come to rely on.  It does not appear that COMCAST supports VPN end points on their SMC8013.  The easiest thing would be to get my BEFVP41 to see the external address.  When I view the BEFVP41's Status screen, it sees no WAN addresses.  Can I set up a route to it from the SMC8013?  I have tried "experimenting" with NAT, Port Forwarding, and Advanced Routing features with no success.

Any help would be greatly appreciated.
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Top Expert 2004
If you disconnect everything from the cable modem, and then put a PC/Laptop only on the modem - is the modem itself giving out DHCP and doing NAT?  If so, you can probably put in the modem's IP and get into it to manage it and then change it to "bridge mode" so that it doesn't "host" the public IP but instead passes this straight to the router's WAN port instead.


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