how do you connect a cisco router to the internet through a cable modem/ router gateway

[breynold76]

I have searched on here but can't find the exact answer i am looking for. I have a cisco 1760 router and a 2950 switch. The router has an ethernet wic card added so i have two ethernet connections available. I would like to connect the cable modem gatway to the router through one of the ethernet connections on the router and then to the switch. I cannot seem to get this setup to work. There are several different ways i have seen posted to accomlish this. dhcp, no dhcp, creating a seperate network, and giving the e0/0 an ip address within the range of the cable gateways network addresses. None of this has worked. Can anybody post the commands that need to be entered on the router to make this possible?

[Bilal Nawaz]

Hello Bernard, thanks for trying this. Did we plug from the Motorola direct to the router fa0/0?

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[breynold76]

yes the Motorola is connected directly to fa0/0 on the router.

[Bilal Nawaz]

What's strange is that you're not picking up an IP address - whats  different about the PC and the router (theyre just hosts)?? It works  when you plug a laptop or PC in...

Dont connect anything in to the network. Just leave the motorola plugged in to the router fa0/0.

Can we try saving the config and reload the router please...

If the logging is enabled we could try 'debug ip packet' and the other dhcp debugs when the router comes back up.

Starting to run out of ideas on how we can get this to work.

It's not even picking up an IP address when its directly connected which is a concern....

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[breynold76]

this came up once before and it went away for a week. now it is back. not sure what this is exactly but i cannot get back into R1.

loadprog: bad file magic number:      0x0

boot: cannot load "flash:"

System Bootstrap, Version 12.2(7r)XM2, RELEASE SOFTWARE (fc1)

TAC Support: http://www.cisco.com/tac

Copyright (c) 2003 by cisco Systems, Inc.

C1700 platform with 98304 Kbytes of main memory

rommon 1 >

[Bilal Nawaz]

Ok... seems like we've landed in rommon mode.

can you please type in:

dir flash:

and show us what is there please?

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[breynold76]

rommon 3 > dir flash:

         File size           Checksum   File name

      1078 bytes (0x436)      0xd31c    config

[Richard Burts]

Perhaps it might help if you power down, reseat the flash, and power up again?

HTH

Rick

[breynold76]

i reseated the memory which did not seem to be fully locked into place, but it did not seem to help still getting rommon

[breynold76]

do i just need new memory or is the router bad? i have two other identical routers minus the Ethernet wic cards.

[Bilal Nawaz]

I dont believe the router is bad - it has no IOS image to boot from, which seems bizarre. Why would the image just disappear like that, unless it was deleted.

We could either leave this router and get one of the other two, and fix this router afterwards? (can be quite a long process)

If we were to take this option, then taking the WIC cards out and putting them in the other one would do...

Sorry about asking for the 'reload'... Just caused even more problems.

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[Richard Burts]

I agree that it makes good sense to set this router aside for now and use one of the other routers to test the connection to the cable modem. Once we get that issue solved you can decide whether to use router on a stick with the second router or to try using the Ethernet card in the router, or to go back to the original router.

As long as you have other identical routers then it should not be too bad to fix the original router. You can copy the IOS image from the identical router to the hard drive of a PC and then use the PC as a source to copy the image to the original router. I believe that the 1760 supports the tftpdnld capability which uses TFTP to load an image to flash when you are in rommon. It may get a little tedious but it should not be too difficult.

HTH

Rick

[breynold76]

that works for me. i can just do something with the other router later. so should i try the router on a stick or the direct connection to fa0/0?

[Bilal Nawaz]

Lets try the direct connection first :-)

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[Richard Burts]

I suggest that we start with it as simple as possible. We can add other things to it later. But I would like to focus on the router Fa0/0 connected directly to the cable modem as a starting point.

HTH

Rick

[breynold76]

are the commands for the fa0/0 just this or is there more?

R1(config)#int fa0/0

R1(config-if)#ip address dhcp

R1(config-if)#no shutdown

if this is correct I entered this and got the same results as before.