Unable to SSH into my proxmox hypervisor from a VM

Rémy Bauduin

1/29/23, 12:49 PM

to start, here is my infra in summary :

I have a Proxmox server with an IP public, I created a vmbr1 bridge from Proxmox (192.168.0.1) and I use IP 192.168.0.108 for my VM.

Here is the route : 192.168.0.0/24 dev vmbr1 proto kernel scope link src 192.168.0.1

I deleted all iptables rules, I have this one left for NAT:

Chain POSTROUTING (policy ACCEPT 786 packets, 36868 bytes)

pkts bytes target prot opt in out source destination

707 40652 MASQUERADE all -- * vmbr0 192.168.0.0/24 0.0.0.0/0

When I try to connect in SSH from the VM 192.168.0.108 on the hypervisor it does not work. I can see packets passing through with a tcpdump.

Do you have any idea? I've been stuck on this for several days.

Thanks to you !

EDIT :

Here is /etc/network/interfaces :

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual
    network X.X.X.0

iface eth1 inet manual

auto vmbr0
iface vmbr0 inet static
    address X.X.X.X/24
    gateway X.X.X.1
    bridge-ports eth0
    bridge-stp off
    bridge-fd 0

iface vmbr0 inet6 static
    address X/64
    gateway X

auto vmbr1
iface vmbr1 inet static
  address 192.168.0.1
  netmask 255.255.255.0
  bridge_ports none
  bridge_stp off
  bridge_fd 0

Here is iptables -L -t nat :

Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
MASQUERADE  all  --  192.168.0.0/24       anywhere

528

0 + 0

ssh

nat

proxmox

djdomi

1/29/23, 7:41 PM

I think you setup a mixed routing and bridged setup, [take a look on this post from my self](https://serverfault.com/questions/975406) because you mixed a lot. I am basically unsure for what reason you mask the netmask, it's a Public known address

Michael Hampton

1/29/23, 8:57 PM

What does it mean "does not work" when you ssh? Please show us the error you get when you ssh tto 192.168.0.1.

Rémy Bauduin

2/1/23, 7:43 PM

Solved by restarting the server, thanks for the answers ...

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Unable to SSH into my proxmox hypervisor from a VM

TH: ไม่สามารถ SSH เข้าสู่ไฮเปอร์ไวเซอร์ proxmox ของฉันจาก VM

RO: Imposibil de SSH în hypervisorul meu proxmox de la o VM

RU: Не удалось подключиться по SSH к моему гипервизору proxmox с виртуальной машины

VI: Không thể SSH vào trình ảo hóa proxmox của tôi từ máy ảo

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