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DHCP Relay on Cisco Routers

Posted on 2003-02-21
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Last Modified: 2010-04-17
Hi All.

I've already have an answer to my first question at:

http://www.experts-exchange.com/Hardware/Routers/Q_20521578.html

But since I closed it before testing, I have to put an additional doubt. It may seem loose, but taking a look at the link above will make it clear.

--------
What if my DHCP server's default gateway is not directed to E0 on A-Side Router? I'm telling this because, on A-Side, I've 2 routers: 1 pointing to the remote site (e0=128.2.1.254) and other pointing to the Internet (e0=128.2.1.150), and the default gateway for DHCP is 128.2.1.150

On the Internet router I do have the following config:

ip route 0.0.0.0 0.0.0.0 Serial0
ip route 128.1.1.0 255.255.255.0 128.2.1.254
!
access-list 1 permit 128.1.1.0 0.0.0.255
access-list 101 permit ip any any

In this case, do I need to add any additional config to the A-Side router? I believe the ip routes set have nothing to do with BOOTP requests, right?

Many thanks,
Ricardo

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Question by:RicardoBSF
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Expert Comment

by:lrmoore
ID: 7996617
Try making your default gateway 128.2.1.254 on the server,
and on that router, make sure you have another default route:
ip route 0.0.0.0 0.0.0.0 128.2.1.250
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Accepted Solution

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lrmoore earned 600 total points
ID: 7997279
Or, on your server, you can add a specific route:

C:\>route add -p 128.1.1.0 mask 255.255.255.0 128.2.1.254

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Expert Comment

by:lrmoore
ID: 8036005
Ricardo,
Do you need more information? Did this help you solve it?
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Author Comment

by:RicardoBSF
ID: 8044244
Hi Lrmoore.

I'm sorry I could not reply to you before, but I was outside town. I did the tests just today, and they worked quite fine. I am able to obtain DHCP addresses between networks.

One thing I was not able to do was to make a Windows 2000 workstation on side A to join the domain hosted on a server on side B... WINS and DNS are running on the server, I am able to make a machine on the B side join the domain (i.e., it is working on the same LAN, but not across networks).. Maybe a protocolo/port forward missing?

As I am new to this forum, I'm not sure about the correct procedures.. I was thinking about raising the points to this question (since it is evolving), but perhaps I should post it on other area..

Let me hear your comments.

Thanks,
Ricardo
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LVL 79

Expert Comment

by:lrmoore
ID: 8044659
Are you using DNS? Does the DNS server from the subnet at site B have a route back to the subnet at side A? Assuming, of course that you're using DNS properly with SVR records to find the domain controller...

You can increase the points here, or close this Q out and open a new question with the new issues, either way.

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Author Comment

by:RicardoBSF
ID: 8119679
Hi lrmoore.

Thanks for your comments. I've found some minor problems on my DNS server, which were preventing workstations from correctly receiving the due information. Everything is working fine now.

Cheers,
Ricardo
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LVL 79

Expert Comment

by:lrmoore
ID: 8119711
Glad you're working!

Cheers!
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