Host machine stops responding via SSH

iivan

New Member
Dec 7, 2020
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I have a dedicated Hetzner server with Proxmox 6.3.2 installed on Debian 10 after following this guide:

https://community.hetzner.com/tutorials/install-and-configure-proxmox_ve

I also have two additional IPs.


The problem is that after some time (happens randomly between 15 minutes to 6 hours) Host machine becomes unresponsive via SSH (maybe loses Internet?). But VM's are running and available through SSH.


Both VMs have separate MAC addresses and using vmbr0 bridge. Syslog and /var/log/messages don't provide any output at the moment machine becomes unresponsive.


These are the configs from /etc/network/interfaces

Host machine (enp3s0 is provided by Hetzner in a default installation, vmbr0 config is from Hetzner guide above)

Code:
source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback
iface lo inet6 loopback

auto enp3s0
iface enp3s0 inet static
  address <Main IP>
  netmask 255.255.255.224
  gateway <Main gateway>
  pointopoint <Main gateway>
  up route add -net 5.9.8.64 netmask 255.255.255.224 gw <Main gateway> dev enp3s0

iface enp3s0 inet6 static
  address 2a01:4f8:160:73a3::2
  netmask 64
  gateway fe80::1

auto vmbr0
iface vmbr0 inet static
  address <Main IP>
  netmask 255.255.255.224
  pointopoint <Main gateway>
  gateway <Main gateway>
  bridge_ports enp3s0
  bridge_stp off
  bridge_fd 1
  bridge_hello 2
  bridge_maxage 12



VM config (also taken from Hetzner guide above)

Code:
auto lo
iface lo inet loopback

auto ens18
iface ens18 inet static
  address <additional IP>
  netmask 255.255.255.255
  pointopoint <Gateway of the additional IP>
  gateway <Gateway of the additional IP>


Thank you for any help
 
I have a dedicated Hetzner server with Proxmox 6.3.2 installed on Debian 10 after following this guide:

https://community.hetzner.com/tutorials/install-and-configure-proxmox_ve

I also have two additional IPs.


The problem is that after some time (happens randomly between 15 minutes to 6 hours) Host machine becomes unresponsive via SSH (maybe loses Internet?). But VM's are running and available through SSH.


Both VMs have separate MAC addresses and using vmbr0 bridge. Syslog and /var/log/messages don't provide any output at the moment machine becomes unresponsive.


These are the configs from /etc/network/interfaces

Host machine (enp3s0 is provided by Hetzner in a default installation, vmbr0 config is from Hetzner guide above)

Code:
source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback
iface lo inet6 loopback

auto enp3s0
iface enp3s0 inet static
  address <Main IP>
  netmask 255.255.255.224
  gateway <Main gateway>
  pointopoint <Main gateway>
  up route add -net 5.9.8.64 netmask 255.255.255.224 gw <Main gateway> dev enp3s0

iface enp3s0 inet6 static
  address 2a01:4f8:160:73a3::2
  netmask 64
  gateway fe80::1

auto vmbr0
iface vmbr0 inet static
  address <Main IP>
  netmask 255.255.255.224
  pointopoint <Main gateway>
  gateway <Main gateway>
  bridge_ports enp3s0
  bridge_stp off
  bridge_fd 1
  bridge_hello 2
  bridge_maxage 12



VM config (also taken from Hetzner guide above)

Code:
auto lo
iface lo inet loopback

auto ens18
iface ens18 inet static
  address <additional IP>
  netmask 255.255.255.255
  pointopoint <Gateway of the additional IP>
  gateway <Gateway of the additional IP>


Thank you for any help
You're talking about connection via WAN (internet) I suppose. First of all check whether the packets arrive as expected at the WAN NIC by running
Code:
tcpdump -eni enp3s0
- If the packets arrive properly (but are not answered) check the guest's IP configuration respectively track the packets in virtual Proxmox network
- If the packets do not arrive properly ask your provider what may block the packets