[SOLVED] Can't Access GUI From Different Subnet

[lowenbrau]

Hi,

I recently moved the Proxmox Management to a new subnet (we will call it subnet B) by using IP address 10.1.200.20. The proxmox GUI can be accessed from the new subnet. I can also ssh into the server from the new subnet. If however I attempt to access the GUI or ssh into the server from a different subnet (i.e., subnet A), I am unable to do so. I checked the firewall between the two subnets and I do see traffic leaving subnet A and attempting to access the proxmox server on subnet B. I am not sure why I am having these issues. Do you have any ideas?

Please note that VLANs are being used.

Here is the hosts file:

127.0.0.1 localhost.localdomain localhost
10.1.200.20 proxmox1.thelowes.network proxmox1

# The following lines are desirable for IPv6 capable hosts

::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

and here is the interfaces file:

auto lo
iface lo inet loopback

iface enp5s0 inet manual
#Proxmox Management

iface enp1s0f0 inet manual

iface enp1s0f1 inet manual
#Trunk

iface enp1s0f2 inet manual

iface enp1s0f3 inet manual

auto vmbr0
iface vmbr0 inet static
address 10.1.200.20/24
gateway 10.1.200.1
bridge-ports enp5s0
bridge-stp off
bridge-fd 0
#Proxmox Management

auto vmbr3
iface vmbr3 inet static
address 10.0.30.0/24
bridge-ports enp1s0f2
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094

auto vmbr1
iface vmbr1 inet manual
bridge-ports enp1s0f0
bridge-stp off
bridge-fd 0

auto vmbr2
iface vmbr2 inet manual
bridge-ports enp1s0f1
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094
#Trunk

auto vmbr4
iface vmbr4 inet static
address 10.1.100.0/24
bridge-ports enp1s0f3
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094

auto vmbr5
iface vmbr5 inet static
address 10.0.50.0/24
bridge-ports none
bridge-stp off
bridge-fd 0

Any help that can be provided would be greatly appreciated.

Thank you in advance

 

[Moayad]

Hi,

maybe the issue might to the routing `ip route` on the subnet B?

I would to stop the Firewall in order to narrow down the issue if it's related to the firewall.

 

[lowenbrau]

Hi,

maybe the issue might to the routing `ip route` on the subnet B?

I would to stop the Firewall in order to narrow down the issue if it's related to the firewall.

Hi Moayad,

I ran the 'ip route get <ip address>' command for an IP on the 10.1.100.0/24 subnet and noticed that it was routing the request to vmbr4, which is not connected. After removing that Linux Bridge (it was no longer needed), I had connectivity.

Thank you for pointing me in the right direction!! It's greatly appreciated.

 

[Moayad]

Glad to read that you fix the issue yourself! I will go ahead and set your thread as [SOLVED] to help other people who have the same issue.

Have a good day