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DHCP and IP advertising router

By amalig ·
DHCP does not work on one of our subnets (vlan87)
also, when using our Fluke tester to auto-discover the network on the above subnet/vlan87, it says "no ip advertising router found" - What does this mean? what advertising? what packets? what parameters on the router is it referring to?

we think this might have something to do with our dhcp problem.
Can you also talk about DHCP? what type of packets, broadcasts? or whatever details about it that might give us a clue to what's causing dhcp not to work

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DHCP and IP advertising router

by cul8rm8e In reply to DHCP and IP advertising r ...

Set up a DHCP relay agent on your subnet and let us know if this sorts out your problem!

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DHCP and IP advertising router

by amalig In reply to DHCP and IP advertising r ...

we use helper-addresses. and we don't use unnumbered interfaces.

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DHCP and IP advertising router

by Dragon Emperor In reply to DHCP and IP advertising r ...

Have you tried pinging the router or DHCP server from subnet in question? What sort of devices do you have between them and the subnet? Have you tested connectivity between these devices and the router?

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DHCP and IP advertising router

by mshavrov In reply to DHCP and IP advertising r ...

What router do you have? Since you mention "vlan87" I can assume you have something like Cisco Catalyst with Layer3 module.

1. Check if you have routing form that network at all. Configure ine PC with static IP address and try to ping devices in the network.

2. Check if you have "ip helper-address" command in THIS interface configuration. This command forwards all broadcast traffic to specific destination. Look what you have in another interfaces configuration and copy to this interface. Usually it's something like "ip helper-address 10.1.2.3" where 10.1.2.3 is your DHCP server.

3. Check your DHCP server if it has required scope created and everything is correctly configured.

If you have not Cisco Switch/Router, you should lookfor manufacturer's documentation how to configure broadcast forwarding, or just compare configuration of "working" interface with configuration of "not-working" interface.

If you have more questions, contact me by e-mail.

Good luck.

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