Checking my set up for DHCP conflicts 5

[eaglepromopro]

If I use the LAN 1 to a POE for my 9611gs and then set LAN 1 to a IP address on the customers network lets say customers network is 192.158.1.1 my Route is 192.168.1.1 and the IPO is 192.168.1.51 and the IPO is set for DHCP will this cause a DHCP conflict or interfere with the clients other network devices using DHCP like their PCs and Printers?

 

[derfloh]

If there is another DHCP Server in this network this will produce conflicts that can bring your network or at least parts of the network down.

 

[gkittelson]

As Derfloh said, not a good idea. You should only, ever, have one DHCP server on any single network.

If your other DHCP server isn't capable of sending out the 176 and 242 DHCP options, the Avaya DHCP will make your phones work properly and give your other devices addresses just like your other DHCP server.

Sometimes it's easier to just let the Avaya DHCP handle things if your router and DHCP server aren't very sophisticated.

 

[eaglepromopro]

Thank you. Yes there is their original router that is providing the DHCP. This then would explain why their network did go down.

I do need to provide voice mail to email so would it be best to set up the 9611s on LAN 2 using IPOs DHCP at 192.168.43.1 and then set up the LAN 1 as 192.168.1.XX on their router and set the IPO ROUTE as LAN 1 192.168.1.1?

Or do you recommend a better way to keep both networks separate but providing voice mail to email?

Thanks!

 

[raoul008]

It depends on how their cabling is i would use lan1 to the phone network and lan2 as a wan interface to the main network but if they have some phones that use the same wiring and is use as pass trough to their pc just use a fix address on their network for the ipo and let their dhcp on there is multiple scenarios here since we don’t know the whole setup

 

[gkittelson]

Raoul's reply speaks to why I didn't go into more detail, since there are a hundred things we don't know about your network and how it works. If you can turn off DHCP on your router that is currently providing DHCP and the IP Office can provide DHCP for those devices, everything should be fine with just the IP Office providing DHCP. You'll want to be sure that the scope for the IP Office isn't trying to hand out addresses that might be set statically or conflict with existing leases. Then everything will work for you.

The other alternative is to setup your existing router with the 176 and 242 options as I mentioned before. If your existing router can't do that, then best to use the IP Office. However, if your router needs to hand out addresses for VPNs and other things you might have problems.

The way we setup for all of our clients is we have the router or a server handing out addresses on the main vlan and the router or IP Office handing out addresses on their VLAN, but we only ever use the one NIC on the IP Office. You would need to have switches that have the VLANs setup on them and move the phones and IP Office to another IP subnet with the proper routing, etc.

I thought, from your post, that this was new to you. From your second post that is confirmed, so I am trying to present the simplest possible way to accomplish your goals without your having to become a networking expert.

Easiest is just use the IP Office for DHCP and turn off DHCP on your router if possible. Particularly if this is a small (under 100 device) network.

 

[derfloh]

If you can have phones in a separate network, I usually have LAN1 connected to the customer network with DHCP disabled and LAN2 connected to the phone Network with DHCP enabled. Default route is over LAN1.

I don’t like to provide IPs to client computers from IPO as it can lead into discussions if the customer wants to change things. Let them do the the network.