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Forum Discussion
tspotorno
Aug 17, 2011Aspirant
Multiple Routers / Single Lan Question
We are moving an app server to a new IP address (switching internet providers and we have both active for 1 week). This poses a problem as the app server is in use 24/7 and we cannot be down to switc...
adit
Aug 24, 2011Mentor
Yes, and if the application works off of DNS, set the TTL's to 1 minute, let it run for a day (or whatever your current TTL is) to wipe out the DNS caches, and then disconnect the old Internet line.
mlaing wrote: This will never work. Here is what is going on: Okay, traffic comes in on the second router. It forwards the traffic on through to the server. The server receives the traffic fine. Okay, now the server needs to send traffic back, so it looks at the IP address and looks at its routing table. Its routing table says that if it needs to reach 0.0.0.0/0 to send the traffic to router 1. Router 1 will probably forward the traffic, but will change the source IP address to its WAN address. So the traffic coming back to the client has a different IP address than who it sent traffic to ---- In turn because of this, the traffic is dropped. Your problem here is that your entry point in the network is different from your exit point (This is always a problem for NAT). The only way I can think of to do what you are wanting to do is to assign multiple IP addresses to a single router. That way all traffic enters and exits the network from the same place.
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