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Subnets

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by geno

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I have a domain and lan setup for our site. We are part of a much larger wan. I have a remote site with a T1 connecting the 2 sites. Say our domain is XXX.xxx.XX3.0 with a gateway of XXX.XXX.XX3.1 and a mask of 255.255.255.0 I was told that the routers at the couldn't be in the same ip group so the one at the remote site was setup as XXX.XXX.XX2.129 and the workstations were set to XXX.XXX.XX2.130 thru 145 Although this works it keeps giving me little problems that I believe would go away if the subnet could be part of our block of IPs so my question is: do both routers have to be part of different subnets?

6 replies

by tommymcbrayer

Since the two networks are talking then I think you should address what the little problems actually are then start troublshooting. Some of your example is a bit confusing but if I understand correctly. Yes they should be separte networks. Same subnet makes for bridging across routers so
main router 172.16.3.1 255.255.255.0
routing to
site router 172.16.2.1 255.255.255.224
is ok

let me know if you need additonal assistance.
TL McBrayer CNE-5, CNE-6, CCNP, CXE

by wroming

Here is the reasoning behind different networks.

Will it work if they are in the same subnetwork-yes they will

Would it be good management- No

Here are the reasons why:

1. It would be easier to manage if you had a class B address subnetted down to a "C" just for the reason sake that say 172.20.1.x is one building and 172.20.2.x is another building connected via router IE T-1.

Also for even more management you could give your Serial INT or WAN connections a class C subneeted out for example 192.168.1.0 can be subnetted out to 255.255.255.248 that away you have a smaller broadcast domain between the routers and just NAT the internal IE Class B to the class C and if you have mulitple router locations just increment the 3rd bit so the next set of routers would be 192.168.2.0 and so forth so on. If you need any more assistance just let me know. wroming@ci.killeen.tx.us

by geno

Thanks all, I guess it's back to fixing the little problems one at a time.

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