[SOLVED] No connection to internet after fresh install

[efgiese]

Hi,
i have installed Proxmox 8.3.1 with defaults. The DNS works, it finds the correct IP-Address for the hosts. I can ping the other hosts in my network. I cannot ping the gateway or any host in the internet. I think that is wired, but i cannot solve this.
The /etc/network/interfaces looks like this:

root@pve:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

iface enp3s0 inet manual

auto vmbr0
iface vmbr0 inet static
    address 192.168.178.128/24
    gateway 192.168.178.1
    bridge-ports enp3s0
    bridge-stp off
    bridge-fd 0


source /etc/network/interfaces.d/*

The ip-address:

root@pve:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP group default qlen 1000
    link/ether 10:ff:e0:40:7f:4a brd ff:ff:ff:ff:ff:ff
3: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 10:ff:e0:40:7f:4a brd ff:ff:ff:ff:ff:ff
    inet 192.168.178.128/24 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 fe80::12ff:e0ff:fe40:7f4a/64 scope link
       valid_lft forever preferred_lft forever

The route:

root@pve:~# ip r
default via 192.168.178.1 dev vmbr0 proto kernel onlink
192.168.178.0/24 dev vmbr0 proto kernel scope link src 192.168.178.128

Ping some host:

root@pve:~# ping 192.168.178.10
PING 192.168.178.10 (192.168.178.10) 56(84) bytes of data.
64 bytes from 192.168.178.10: icmp_seq=1 ttl=64 time=0.170 ms
64 bytes from 192.168.178.10: icmp_seq=2 ttl=64 time=0.703 ms
64 bytes from 192.168.178.10: icmp_seq=3 ttl=64 time=0.209 ms
^C
--- 192.168.178.10 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2048ms
rtt min/avg/max/mdev = 0.170/0.360/0.703/0.242 ms

Ping the gateway:

root@pve:~# ping 192.168.178.1
PING 192.168.178.1 (192.168.178.1) 56(84) bytes of data.
From 192.168.178.128 icmp_seq=1 Destination Host Unreachable
From 192.168.178.128 icmp_seq=2 Destination Host Unreachable
From 192.168.178.128 icmp_seq=3 Destination Host Unreachable
^C
--- 192.168.178.1 ping statistics ---
4 packets transmitted, 0 received, +3 errors, 100% packet loss, time 3092ms
pipe 4

The 192.168.178.10 is DNS/DHCP Server and 192.168.178.1 is the gateway.

 

[efgiese]

The node got the same ip-address as a VPN-Device. I set another ip-address to the node. That fixed it..