IP Configuration

[rdgsystems]

Please help me with a solution for this problem:

We have a Cisco 2600 Series Router which is connected over a Serial link to the ISP, previously we had 256 kbps link which has recently been upgraded to 512 kbps over the same line. Now the ISP has given us a new pool of IP address, please let me know how to configure the new pool of Public IP address so that we can use them.

The present configurations on the router are as follows:

ip address of ethernet port0/0 203.197.107.97/255.255.255.240

ip address of Serial port0/0

203.197.108.237 255.255.255.252

ip default-network 0.0.0.0

ip route 0.0.0.0 0.0.0.0 Serial0/0

The new pool of ip given starts from 203.197.117.80 255.255.255.240, please give me a solution as to how to use theses ips by properly configuring the router. There is only one physical leased which has been upgraded to 512 kbps from 256 kbps, one modem and one router connected to the modem on our side of the network. We need the old public ips also as our DNS and Journals are registered with the old ips. We need to use both the pool of ips(old as well as new). SOS

[mhussein · Accepted solution]

Depending on what devices are connected to ethernet 0/0 interface, configuring the new subnet as secondary may do the job:

interface ethernet 0/0

ip address x.x.117.81 255.255.255.240 secondary

So the interface configuration should look like:

interface ethernet 0/0

ip address x.x.107.97 255.255.255.240

ip address x.x.117.81 255.255.255.240 secondary

...

The range x.x.117.82 - x.x.117.94 would be available for public hosts, with default gateway x.x.117.81

HTH,

Mustafa

p.s. please remember to remove/mask public ip addresses and any sensitive configurations.

[rdgsystems]

Thanks The problem has been solved, thanks very much once again