Can you bridge the WAN and LAN

[jondiamond]

We are using the 504 to publish an ISA server which we want to use as an L2TP endpoint. To do this we cannot have the router run in NAT mode we need to effectively bridge the LAN and WAN interfaces.

I have managed to do this on some routers by giving the LAN and WAN the same IP address, other routers I have given both public IP's from my available blockt and on the SAR715 I used ZIPB, however I can't find a way of doing this on the 504.

Has anyone managed this or know how to achieve it?

Cheers

Jon

[adriandaz]

so basically, you want public IPs on both the LAN/WAN?

[Not Routed]

The way I have configured non NAT so the LAN and the WAN Interface uses a public IP is to do the following:-

- Delete the WAN Interface First (Had access problems if not)
- Configure the LAN Interface with the public router IP and subnet
- Apply the settings and change your network card settings to the new LAN address range
- Access the router web interface and Save settings to Flash
- Create WAN Interface with NAT Disabled.
- Enter the public IP address of the router but set the subnet to 255.255.255.255 (Router Resonds with Error if subnet is the same as the LAN SEE BELOW)
- Apply settings
- Restart Router

The router reponds with an error if both the LAN and the WAN have the same subnet eg 255.255.255.248.

Also be aware that with out the firewall up the routers web interface is exposed on the WAN side

Im not sure this is the correct way to do it? Any comments please as setting the subnet mask to 255.255.255.255 on the WAN interface seems to be a "Fudge" in my eyes!!

[adriandaz]

if only I had public IPs to experiment with :(

[jondiamond]

adriandaz, yes sounds simple doesn't it.