VLAN question. How do you do it?

[Frazzle]

Currently have 2 VLANS, one for phones and one for data. All switches on site are layer 2. Both VLANS are connected to the ISP router on different ports which does layer 3 routing. The plan is to get a dedicated line in for the phones controlled by the phone supplier. The phone supplier is giving us a router for their line. Is it just a matter of pointing the phone VLAN default gateway to the new router? Removing the cable from the ISP router for the phone VLAN? I know I may need to change the DHCP scope for the phone VLAN subnet but is it that simple?

[mavhc]

Pretty much, assuming you want 0 interaction between vlans. I like to have my computers be able to setup calls between people with a single click, make your phone call a parent straight from MIS etc

[DavetheITguy]

Disable the VLAN routing between those VLANS and set the DHCP helper for the phone VLAN to the new ISP router, that way the phones will get their DHCP leases from the new ISP router provided while the other VLAN will still get their DHCP leases from the other router. What vendor are you using for equipment?

[mavhc]

Make sure the vendor has secured their equipment, last people I checked they'd not changed the admin password from admin, and not disabled the pc switch on the phone, so easy to hack.

[Frazzle]

Disable the VLAN routing between those VLANS and set the DHCP helper for the phone VLAN to the new ISP router, that way the phones will get their DHCP leases from the new ISP router provided while the other VLAN will still get their DHCP leases from the other router. What vendor are you using for equipment?

I don't have access to the Router (Cisco) as it belongs to the Broadband provider. I wont have access to the Phone suppliers Router either when it is installed.

At the moment the phone VLAN has its own DHCP server (legacy as it was part of the old Admin Network, years ago). Where would the DHCP helper details go if we only have Layer 2 switches and no access to the Routers?

[mavhc]

DHCP helper is if the DHCP server isn't in the broadcast domain, ie same subnet, 192.168.0.x for example

 

If it's not then it's the IP of the DHCP server, you'd need support for it on your switch or the router you're sent, probably already set up if it's managed

[Frazzle]

DHCP helper is if the DHCP server isn't in the broadcast domain, ie same subnet, 192.168.0.x for example

Well the DHCP server for the phone VLAN is in the same subnet as the phones.

There is a separate DHCP server for the Data VLAN.

[mavhc]

Don't need a dhcp helper then