topic Re: Different Subnets on same vswitch? in Operating System - HP-UX

Different Subnets on same vswitch?

Ian Dennison_1 — Mon, 25 May 2009 09:35:54 GMT

Struggle with networking, so here goes...

2 VM Guests, different subnets, and one can't talk out. Do I need,...
a) Different vswitch for different subnets, and tie both switches to the same LAN card?
b) Different vswitch for different subnets, each tied to its own lan card on the same subnet?
c) Something else?

We are using VLANs on the physical network, and connecting hosts to dual network VLANs is verboten! Any pointers?

Share and Enjoy! Ian

Re: Different Subnets on same vswitch?

likid0 — Mon, 25 May 2009 12:18:18 GMT

Hi, Ian

What I have is a different vswitch's for each nic that is on a different vlan.

so for example, I have

physical vlan1(subnet 172.x.x.x) - nics 1 and 2 that form vswitch-por

physical vlan2 (subnet 192.168.x.x) - nics 3 and 4 that form vswitch-gest

so then I map 2 virtual nics to each guest, one on each vlan/subnet

Re: Different Subnets on same vswitch?

Charles G. — Mon, 25 May 2009 15:22:27 GMT

Ian,

We use VM guests in different VLAN on the same vswitch, by setting the vlan tag on the vswitch port for each vm with hpvmnet -S vswitchname -u portid::vlanid: after creating the vm and retrieving the vswitch associated port with hpvmnet -S vswitchname -p all

Re: Different Subnets on same vswitch?

Ian Dennison_1 — Tue, 26 May 2009 10:50:33 GMT

Gents

I have tried this but not had any luck. Does the VLAN ID need to match the actual VLAN ID on the physical network or can it be any number?

Do the VM Guests still have the same Gateway as the physical Servers?

Share and Enjoy! Ian

Re: Different Subnets on same vswitch?

Mel Burslan — Tue, 26 May 2009 14:59:40 GMT

Ian,

The VLAN id on your physical network only matters if you are using trunking. By trunking, I mean, running different subnets on the same physical interface. I am nopt familiar with VMs running on HPUX boxes but considering you mentioned 2 different switches, I am assuming you are using 2 separate physical ports in which case VLAN ID (or tag) should not make a difference. But if you can post a drawing or verbally describe your physical LAN connections and any VLAN configurations on the HPUX side and the switch side, it might help us understand your picture better and offer more meaningful answers.