[SOLVED] Issue with accessing other subnet IP range

JorisDijk

New Member
Oct 28, 2024
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Hello Proxmox Community,

I'm a bit lost and I hope someone can help me with this.
I'm hosting at hetzner and had initially one IP address (on /27 range). Now this is fine as I'm still setting up the initial IP was: 176.9.**.*** where the proxmos is also running on. The IP is reachable i had set restrictions for IP access to the webpanel and ssh to ensure security. I decided to buy a /29 range where the gateway would be equal to my initial IP and the IP range is as following 78.46.**.***

Code:
My interface is:
auto vmbr0
iface vmbr0 inet static
      address      176.9.**.***/27
      gateway      176.9.**.*** (other ip then my address but same start)
      bridge-ports enp34s0
      bridge-stp   off
      bridge-fd    0
      up           sysctl -p
      post-up iptables -t nat -A POSTROUTING -s '192.168.192.0/18' -o vmbr0 -j MASQUERADE
auto vmbr1
iface vmbr1 inet manual
    bridge-ports none
    bridge-stp off
    bridge-fd 0
auto vmbr2
iface vmbr2 inet static
      address      192.168.192.5/18
      bridge-ports none
      bridge-stp   off
      bridge-fd    0
      post-up      iptables -t nat -A POSTROUTING -s '192.168.192.0/18' -o vmbr0 -j MASQUERADE
      post-down    iptables -t nat -D POSTROUTING -s '192.168.192.0/18' -o vmbr0 -j MASQUERADE
      post-up      iptables -t raw -I PREROUTING -i fwbr+ -j CT --zone 1
      post-down    iptables -t raw -D PREROUTING -i fwbr+ -j CT --zone 1

Cloud-Init IP Config (net0):
IPv4/CIDR: 78.46.**.***/29 is just a ip address within the range not the first and not the last one due to subnet and broadcast IPs. and gateway as defined by hetzner 176.9.**.*** (same as my Proxmox ip).

When trying to run console arp -a on the VPS it returns:
ubuntu@vps109-cus2:~$ arp -a
? (176.9.**.***) (Proxmox IP) at <incomplete> on eth0

doing arp -a on the proxmox I don't see it neither. the VPS is connected to vmbr1 when i connect the vps to vmbr2 and give it a dynamic IP the VPS can ping and do everything fine wihout any issues but of course has the Proxmox IP while I want to give everyone their own IP

For the tests I completely disabled Firewall also the ones from Proxmox and restarted several times.

I reinstalled everything and followed the tutorial from Medium in combination with the one from hetzner and it works fine now! No support needed anymore <3
 
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