Proxmox on Debian Buster host with Centos 8 Guest

[jhaertl68]

Im searching for a network configuration for a routed network between a Host with Debian Buster and a guest System on Centos 8.
Anything i have tested was not realy working about this constallation.
On Host i use the debian routed konfiguration, that works fine between a debian host and a debian guest.
But I can not find a configuration about a centos guest that works with the vmbr0 bridge.

Can anyone help?

 

[LnxBil]

The network setup is not really different between different Linux guests. You can actually use the same ip commands for both. What have you tried so far?

 

[jhaertl68]

Hi, first it works but i dont no if that ist the only and the right way.

first I use the Proxmoy Installation with routed and single guest ip´s

# device: eth0
auto eth0
iface eth0 inet static
address x.x.20.33/26
pointopoint xx.x.20.1
gateway xx.x.20.1
up route add -net xx.x.20.0 netmask 255.255.255.192 gw xx.x.20.1


# fuer Einzel-IPs
auto vmbr0
iface vmbr0 inet static
address xx.x.20.33/26
bridge_ports none
bridge_stp off
bridge_fd 0
up ip route add xx.xxx.250.217/29 dev vmbr0 (first usable ip adress of the subnet)

with this configuration no trafic from extern to the ip 217 and outgoing to the web

for a test i configure the gateway on the guest to the ip of the host xx.x.20.33

outgoing trafic was working with timeouts :-(

now i use the configuration for a subnet

# device: eth0
auto eth0
iface eth0 inet static
address x.x.20.33/26
gateway xx.x.20.1
up route add -net xx.x.20.0 netmask 255.255.255.192 gw xx.x.20.1

# fuer ein Subnet
auto vmbr1
iface vmbr1 inet static
address xx.xxx.250.217/29 (first usable ip adress of the subnet)
bridge_ports none
bridge_stp off
bridge_fd 0

I´m not realy sure that ist the right way!?!

 

[LnxBil]

I´m not realy sure that ist the right way!?!

The later is exactly what I have besides the up route add command. You have set net.ipv4.ip_forward=1?