[SOLVED] Help: Network problem, not able to set same IP on new NIC

kobemtl

Member
Nov 25, 2020
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0
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Before I start, I want say thank you for the community first. And I did search and tried the solutions from others before. But I still got problem. Here its:

My PVE host has 2 NICs before. The /etc/network/interfaces` config shows below.

Code:
auto lo
iface lo inet loopback

iface eno1 inet manual

iface eno2 inet manual

auto vmbr0
iface vmbr0 inet static
        address 192.168.0.141/24
        gateway 192.168.0.1
        bridge-ports eno1
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address 192.168.0.142/24
        bridge-ports eno2
        bridge-stp off
        bridge-fd 0

I wanna try 10GBE recently and got some used equipment including Brocade ICX 6450-48P and 2 Intel 10GBE NICs. Plan is using 10GB on my PVE and PBS host. So installed both NICs on the hosts. No trouble Debian shows them right after. Then started changing `/etc/network/interfaces` based on what I read. My plan is replacing the old NIC by the new one. Here is what I tried. `enp2s0f0` and `enp2s0f1` is the 2 interfaces from new NIC. For my test only `enp2s0f1` is connected. I will use only this one for my test.

### Try out #1:
First I just tried to replace interface for `vmbr0` by `enp2s0f1`, its not working at all. Either `192.168.0.141` or `192.168.0.142` can not reach the host. The solution comes from this thread
Code:
auto lo
iface lo inet loopback

iface eno1 inet manual

iface eno2 inet manual

iface enp2s0f0 inet manual

iface enp2s0f1 inet manual

auto vmbr0
iface vmbr0 inet static
        address 192.168.0.141/24
        gateway 192.168.0.1
        bridge-ports enp2s0f1
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address 192.168.0.142/24
        bridge-ports eno2
        bridge-stp off
        bridge-fd 0

### Try out #2:
Then I tried to use different IP for `vmbr0`. And it works, I can reach both `192.168.0.151` and `192.168.0.142`.
Code:
...

auto vmbr0
iface vmbr0 inet static
        address 192.168.0.151/24
        gateway 192.168.0.1
        bridge-ports enp2s0f1
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address 192.168.0.142/24
        bridge-ports eno2
        bridge-stp off
        bridge-fd 0

Then I could login WebUI change the `vmbr0` IP back to `192.168.0.141`.
I was happy then I realized non of the VM's network is working. :(

### Try out #3:

Now I am thinking just keeping the old `vmbr0` and `vmbr1` and adding new `vmbr2`. Then somehow set the default interface using by Debian to `vmbr2`. Then later I can change all VMs to use `vmbr2`. This way everything works normally except I really can't find a way to set the default interface to `vmbr1`. I tried `ip route add default`, I tried putting the set the default gateway to `vmbr2`. None of them works. `iperf3` test still see the traffic going through `192.168.0.141`.


### Conclusion:
I don't what to do now. It will be best if anyone can tell me how can completely replace the old gigabit NIC. Otherwise a working solution to set all traffic through new `vmbr2` would be fine as well I guess. Thank you so much for reading the long post first. And I wish some one could help me on this.

PS: I am using `pvesh set /nodes/pve-dellr330/network` every time I change `/etc/network/interfaces`.
 
Last edited:

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