Hello everyone,
After a fresh installation of Proxmox Mail Gateway, I ran into an issue where the configured static IP address from /etc/network/interfaces was not working properly and the gateway was not reachable.
The network configuration itself (static IP, gateway, etc.) was correct, but the system still failed to establish proper network connectivity.
The root cause turned out to be the MTU setting.
I am running Proxmox Mail Gateway as a VM on Proxmox VE, where I use VXLAN. Because of this, a reduced MTU is required. In my setup, I use an MTU of 1450.
After adding
to the corresponding interface in /etc/network/interfaces, the network started working immediately and the configured IP behaved as expected.
So my question is:
Would it make sense to allow configuring the MTU directly during the Proxmox Mail Gateway installation process?
In environments using VXLAN, VLAN tagging, or other overlay technologies, a reduced MTU is not uncommon.
Maybe I am missing something — how are others handling this in similar setups?
After a fresh installation of Proxmox Mail Gateway, I ran into an issue where the configured static IP address from /etc/network/interfaces was not working properly and the gateway was not reachable.
The network configuration itself (static IP, gateway, etc.) was correct, but the system still failed to establish proper network connectivity.
The root cause turned out to be the MTU setting.
I am running Proxmox Mail Gateway as a VM on Proxmox VE, where I use VXLAN. Because of this, a reduced MTU is required. In my setup, I use an MTU of 1450.
After adding
Code:
mtu 1450to the corresponding interface in /etc/network/interfaces, the network started working immediately and the configured IP behaved as expected.
So my question is:
Would it make sense to allow configuring the MTU directly during the Proxmox Mail Gateway installation process?
In environments using VXLAN, VLAN tagging, or other overlay technologies, a reduced MTU is not uncommon.
Maybe I am missing something — how are others handling this in similar setups?