Proxmox multiple GWs alternative?

[Johan Groundstroem]

Hi!
We are migrating from VMware to Proxmox 6.4.x
We have a default Network setup on our Proxmox that works but need a secondary Nic, we call DMZ.

The setup in VMware works with the same connected network cables so I'm missing something config wise on the secondary Nic. I want it to use an alternative GW like the setup in VMWare without changing in the current FW/Route setup. I'm a newbe to this, sorry.

Proxmox ---> LAN ---> 192.168.100.x GW 192.168.100.2
        ---> DMZ ---> 192.168.200.x GW 192.168.200.2

From /etc/network/interfaces

auto eno2
iface eno2 inet manual

#LAN
auto vmbr0
iface vmbr0 inet static
        address 192.168.100.17/24
        gateway 192.168.100.2
        bridge-ports eno1
        bridge-stp off
        bridge-fd 0

#DMZ
auto vmbr1
iface vmbr1 inet static
        address 192.168.200.70/24
        bridge-ports eno2
        bridge-stp off
        bridge-fd 0

 

[spirit]

It's not possible to have 2 default gw. Can you share your vmware setup ?

(Note that you don't need ip addr on vmbr, to have your vms working with their own ip/gateway. ips on vmbr are only used to managed your proxmox server)

 

[VictorSTS]

Tha second gateway will be used for Proxmox itself or that DMZ network will be used by VMs only? If it's the latter, you dont need to setup IP/mask/GW in Proxmox, just connect the VMs to that vmbr1 interface and configure the VMs to use the DMZ network and gateway.

 

[Johan Groundstroem]

Ok, so can I have a more hands on example on this because all traffic from Proxmox is passed through the default GW if I understand correctly. Is the solution to not have a default GW? The system is already in production so can't play around with it to much, hehe.

So for example if I put a Linux machine in the 192.168.100.x network it also reaches the 192.168.200.x network.
But if I put a Linux machine in the 192.168.200.x network it will not through the network settings find it's way to the 192.168.100.x network.

The linux system is then configured to use the 192.168.200.1 GW and DNS.

 

[Johan Groundstroem]

Tha second gateway will be used for Proxmox itself or that DMZ network will be used by VMs only? If it's the latter, you dont need to setup IP/mask/GW in Proxmox, just connect the VMs to that vmbr1 interface and configure the VMs to use the DMZ network and gateway.

DMZ is for hosts only. Proxmox though have IPs in both as shown in the config above.

 

[Johan Groundstroem]

It's not possible to have 2 default gw. Can you share your vmware setup ?

(Note that you don't need ip addr on vmbr, to have your vms working with their own ip/gateway. ips on vmbr are only used to managed your proxmox server)

Thanks!
Then I can remove the one on vmbr1 the proxmox server is managed on the vmbr0 interface.

// J