1720 DHCP Problem

[spyke01]

I have a 1720 router that should pull a dhcp ip from the modem connected at e0, however the address it pulls is a 10.20 ip, the modem is 192.168.100.1

This causes the router not to be able to ping out to the net, ive tried using the pcs nic mac address on that port to try and get it to pick up a proper ip, the one the pc usually gets is in the 75.whatever range, currently its 75.109.220.150


What can i do to get this router to pull a proper ip?

 

[burtsbees]

What is the config of the interface pointing at the modem?
Let's assume that the fa0 interface is pointing toward the LAN, and the e0 interface is pointing toward the modem. the config goes like this...
router>en
router#conf t
router(config)#int e0
router(config-if)#ip add dhcp
router(config-if)#no shut
router(config-if)^z
router#
This is assuming the modem is giving out addresses via dhcp. What sort of modem is this (dsl, cable)? Can you post a running-config? Also, try power cycling both router and modem, modem first. If nothing else, try giving it a static ip on the same subnet as the modem.
I am not understanding about what you are saying about the public IP your computer pulls---how are you doing this? Thanks.

Burt

 

[vipergg]

Save yourself the trouble and hardcode the address on the interface .

 

[spyke01]

i tried hardcoding it and it cant ping the router, i even setup a static route and for some reason its still not working. I know the ports not dead since i had it working off the network just not from the modem

the e0 ip was 192.168.100.2 and the modem is .1 i was told that the version of my ios has problems with dhcp, however i dont have access to a newer version, any other ideas?

 

[burtsbees]

ftp://160.75.2.23/cisco

Happy Birthday

Burt

 

[spyke01]

thanks for all the files mate, this will definately help, ill post back with the results soon

 

[spyke01]

worked perfectly after i uploaded the new ios, started picking up a 75.0.0.0 style ip address and my ttraffic worked, thanks for the files burtsbees, youre a lifesaver. you wouldnt happen to have a 1600 ios would you ? ^^

 

[burtsbees]

How much flash and DRAM do you have? Post a sh ver.

Burt

 

[burtsbees]

Better yet, hit me at
burt_bees@yahoo.com

Burt