DHCP over wan problem

[signalpirate]

hey guys

i have a problem with our dhcp server. I am trying to get have it run as a backup dhcp for a remote location. connection speed would not be an issue here.

at the remote location scope is x.x 167.11 to x.x.167.125 /25 I know this works because thats what they have had configured for years.

at our location here.. we set up another scope x.x.167.192 to x.x.167.254/25

scope options are the same for both sites.

i had our network WAN guys turn on ip helper and when i run a packet sniffer on the server here.. i do see discover packets coming in from the remote location. I even know what computer is requesting a ip renew.

it is requesting an ip x.x.167.73 which is what it had before, but obviously it should get a different one since the scope here is different.

the problem i'm getting is that the dhcp server is only getting discover packets and not doing anything else... it's probably something really stupid but i can't figure this thing out..

any ideas?

[Guest]

DHCP traffic can't route over the internet. Man the internet would be one broken place. Just imagine all them home users plugging in their cable modem into the LAN rather than WAN ports on their routers.

I guess its possible with a DHCP Relay.

[signalpirate]

  ]SK[ said:

DHCP traffic can't route over the internet. Man the internet would be one broken place. Just imagine all them home users plugging in their cable modem into the LAN rather than WAN ports on their routers.

I guess its possible with a DHCP Relay.

we have this implemented down east so i know it does work. and sicne the dhcp packets are actually hitting the local dhcp server here it means that the routers are doing their job...

i'm thinking that it might be something on the server??

another thing to note is that we already have a different scope that does exactly the same thing for a different remote location... and it works perfectly

[bobbba]

  ]SK[ said:

DHCP traffic can't route over the internet. Man the internet would be one broken place. Just imagine all them home users plugging in their cable modem into the LAN rather than WAN ports on their routers.

I guess its possible with a DHCP Relay.

Couldn't see any mention of routing DHCP over the internet in his post. If it's routing DHCP over a WAN link, then yes it's perfectly possible but it needs to be configured correctly. DHCP could be routed over the internet if there was a VPN WAN link as well.

What you need to happen is local DHCP server answers requests as it's quickest.

If the local DHCP server is down, then the router or a DHCP relay agent forwards the request to your remote DHCP which sends a lease back for the client.

If that's how you've got it configured but it's not working then there's something wrong with your DHCP forwarding or your scope. If you are trying to test it with local and remote DHCP server's and the scopes both running it's down to timing as to which answers first.

[garethevans1986]

Does it have to be a DHCP IP, why cant it be static and the server down there be the DHCP Server for that site?

GE