Need help changing Subnets

[jmotsinger]

Hello All,

I am trying to correct the addressing scheme on the company network and I have a question. Currently we are using the public address range 131.131.0.0 - 131.131.255.254 which is our problem that we are trying to fix (We use NAT so that no one on the outside sees our addresses and we know that we should go to private addressing but we are trying to do a quick fix and properly subnet our network for now). Our HQ site uses the 131.131.0.0 255.255.0.0 scheme and by way of ip route lists in our Cisco 2501 routers

ip route 131.131.13.0 255.255.255.192 131.131.13.2
ip route 131.131.13.2 255.255.255.255 Serial0


a remote site is using 131.131.13.0 255.255.255.192. I have tried changing my personal address from 131.131.3.114 to 255.255.248.0 (this allows a subnet 131.131.0.1 - 131.131.7.254) and the address on the e0 port on the router to 131.131.2.248 255.255.248.0 ip unnumbered and I try to ping the address 131.131.13.5 and I get Destination Host Unreachable. If I put 131.131.2.248 as a gatway then I am able to connect. Should I have to make this router a gateway? If so do I have to set the other 5 routers that go to our other 5 branches as gateways? What about network equipment that cannot handle all of those gateways?

Any help would be greatly appreciated. If you have a question about this set up please let me know.

Thanks,
J

 

[pmesjar]

Default gateway address is the ip address of router interface your hosts are directly connected to (of course they have to be on same subnet). So to answer your first question, 131.131.2.248 belongs to subnet 131.131.0.0/21 and this subnet is reserved for your hosts, so this can be the default gateway for your hosts and they should be set up with this IP address. To answer you second question, yes your routers will act as default gateways to your branch offices.

Peter Mesjar
CCNA, A+ certified
pmesjar@centrum.sk