[SOLVED] Whether vmbr1 using the linux bridge is in the broadcast of the vm

[able]

Hi, I had a problem I couldn't understand:

auto lo
iface lo inet loopback

iface eno1 inet manual

iface eno2 inet manual

iface eno3 inet manual

iface eno4 inet manual

auto vmbr0
iface vmbr0 inet static
    address 192.168.1.29/24
    gateway 192.168.1.1
    bridge-ports eno1
    bridge-stp off
    bridge-fd 0

auto vmbr1
iface vmbr1 inet static
    address 192.168.2.29/24
    bridge-ports eno2
    bridge-stp off
    bridge-fd 0
    bridge-vlan-aware yes
    bridge-vids 2-4094

I created a vm with vmbr1 as the network device and its ip is 192.168.1.207, then I execute the ping 192.168.1.29 in the vm shell, but display Destination Host Unreachable
Hence I execute tcpdump -i vmbr1 -w 207_2_29.pcap in promox server, which I parsed "207_2_29.pcap" with wireshark.

Then I created another vm with vmbr1 as the network device and its ip is 192.168.1.209, "207" ping "209" is ok.
I may have overlooked some network configurations...

 

[Chris]

I created a vm with vmbr1 as the network device and its ip is 192.168.1.207, then I execute the ping 192.168.1.29 in the vm shell, but display

Well, according to your network configuration vmbr1 is a dedicated layer 2 bridge, so only network devices connected to the same bridge will be reachable without routing of IP packets. Of course if you attach another VM within the same subnet to the same bridge, they can reach each other.

If you want to communicate between different subnets, you will have to setup routing and/or ip forwarding (please only do this if you fully understand your network and setup your firewall to block unwanted traffic).

Please have a look at the documentation for a few network configuration examples https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_default_configuration_using_a_bridge

 

[able]

Well, according to your network configuration vmbr1 is a dedicated layer 2 bridge, so only network devices connected to the same bridge will be reachable without routing of IP packets. Of course if you attach another VM within the same subnet to the same bridge, they can reach each other.

If you want to communicate between different subnets, you will have to setup routing and/or ip forwarding (please only do this if you fully understand your network and setup your firewall to block unwanted traffic).

Please have a look at the documentation for a few network configuration examples https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_default_configuration_using_a_bridge

Thanks a lot.