Cisco 2600 - make packets appear as from original host
Posted on 2004-08-26
I am not sure what this is called or if it is even possible - but here is my situation - I have a Win2K network - Cisco 3500 switch and a 2600 router - primary WAN connectivity is a point to point T1 off the 2600 back to the home office. There is also a Watchguard Firbox connected to an internet T1 that is VPN back to the home office. This is not usually in use and is to serve as a backup solution. The internal IP of the Cisco is 192.168.10.1 and the internal of the Watchguard is .2 - the gateway for all the PC's and servers is .1 The Cisco has 2 defualt routes - primary is for the WAN, secondary is to the Watchguard at .2 with a metric of 100. When the WAN goes down, the Cisco functions properly...it begins to route packets to the .2 interface of the Watchguard - trouble is, the Watchguard does not like this...all of the traffic is coming from the .1 interface of the Cisco, not directly from the PC's. If I assign the gateway manually to the PC's of .2 it works. I have experimented with alternate gateways at the Windows level, and I don't like how it works. So, my question is this...is there a way to make the Cisco 2600 allow the packets to pass right through it to the Watchguard and not appened any type of header or whatever is actually occuring? Is there a way to make the Watchguard not see the Cisco per say and have it think the incoming packets came directly from the PC's when the Cisco starts routing the packets to it beacuse the WAN is down? I hope that made sense.