IP redirect Cisco 1811
Posted on 2010-01-07
I need a little knowledge about ip redirect.
First of all, are Cisco 1811 capable of ip redirect?
I have a relatively large network with 10 subnets.
These subnets each have their Cisco 1811 router and this ofcourse slows down my network very much.
I have singlemode fiber connections between all these routers, through gigabit converters.
I have the idea that I could put a Catalyst 3750 in the middle, configure layer 3 routing on it and then configure ip redirect on the 9 Cisco 1811 routers.
The 1811 routers all have their own internet connection and this is also what I want in the future, so I´ll let the 1811 continue to route to the adsl interface, unless traffic is meant for any of my other subnets, in that case, it should redirect to the same port with the local ip on the layer 3 switch port instead. I think its called router on a stick.
I think this will work and bypass my 1811 routers if traffic is meant for my other subnets, but I´m unsure of what happens when a client tries to speak to another subnet.
I have WinXP and some Windows 7 clients and some 2008 servers on each subnet.
Will these OS´s have icmp redirect enabled from default or do I need to make changes to them first?
I think what happens is that the client connects to it´s default gateway the first time it tries to send something to the other subnets. The router looks in it´s routing table and discover that there is another route to the subnet in it´s routing table. It then forwards the packet to the ip of the layer 3 switch AND sends the client information that in the future it should go directly that way. The client then stores this information in it´s local routing table and voila, I have gigabit instead of the slow speed of the 1811´s:)
Is it really that simple?
To list my qestions in a simple manner, here goes...
1. Does XP, windows 7 and server 200x understand ip redirect from a cisco router and automatically update it´s local routing table accordingly?
2. Does the Cisco 1811 routers support icmp redirect?
3. Do I need to do anything else than configure the new ip route and the line "ip redirect" on the 1811´s?(After I configured the 3750, that is.)
4. Will this work?:)