DHCP 242 option - setup ?

[dango510]

How do you setup a data scope if that IP Range falls at two locations. Each location has their own IPO unit and each have their own voice VLAN. We obviously want the users to be registered to their respective locations.

Can you add two 242 options to 1 scope? How do you pull the phones to go to their respective VLANS.

Thank you!

 

[amriddle01]

Seperate sites need seperate DHCP servers

 

[tlpeter]

Not really necessary Andy.
It can be possible with one but that would not be very fail save.


BAZINGA!

I'm not insane, my mother had me tested!

 

[amriddle01]

How would the DHCP requests from the remote location reach the server and how would the server tell the difference? I didn't think this as possible

 

[tlpeter]

DHCP relay is the answer.
Even the IPO can have 8 scopes of ranges.
As long as the routers can do the relay then you can do it but i would not do it but for very small sites you can handle this with one server and one scope.


BAZINGA!

I'm not insane, my mother had me tested!

 

[amriddle01]

Ah, I was thinking DHCP relay was for a multiple VLAN envoironment only as oppose to geographically sepereated networks, guess not

 

[tlpeter]

I have seen VPN'd networks in the same range so it should be possible
I would never do it by the way.

BAZINGA!

I'm not insane, my mother had me tested!

 

[dango510]

TlPeter, that brings up a good point.

One of the buildings has several hundred users. They have 192.168.10.0 [VLAN 10]and 192.168.11.0 [VLAN 11] dedicated for voice in the same building. If I want to use 200 IP's from each voice subnet for Avaya IP Phones and the control unit is on 192.168.10.0 and has both voice scopes built in the avaya dhcp server. What vlan needs to be in the dhcp data scope 242, 10 or 11? My thought is what will happen when the phone gets a 11.0 IP address. How will it know the IP office control unit is on VLAN 10? Do I need to create a DHCP scope 242 on VLAN 11 to say "MCIPADD=192.168.10.X"

Make sense?

 

[tlpeter]

The DHCP server should take care of what IP address it will give.
I do not have that knowledge to be honest
The routing should be configured that vlans 10 and 11 can reach each other.

BAZINGA!

I'm not insane, my mother had me tested!