SDN testing , changing MTU on specified interface not changing TAP MTU

S

Szymons

Active Member
Feb 11, 2021
70
8
28
Poland
Hello,

proxmox 6.3-6 with latest updates
Linux 5.4.106-1-pve #1 SMP PVE 5.4.106-1 (Fri, 19 Mar 2021 11:08:47 +0100) x86_64 GNU/Linux
libpve-network-perl is already the newest version (0.4-6).

I want to change mtu on vlan.
My steps :
I am editing /etc/network/interfaces to insert new MTU.
When I am using "ifreload -a" to do this it is changing MTU setting for vlan but not for TAP's on this vlan.
 
Hello,

Thanks for reply.
"This is not yet available in the gui.(should be available soon)"
Now I am using console with ip link set "tap..." mtu XX .
My point was that also console command ifreload not touching this if we change mtu in /etc/network/interfaces .
 
Szymons said:
Hello,

Thanks for reply.
"This is not yet available in the gui.(should be available soon)"
Now I am using console with ip link set "tap..." mtu XX .
My point was that also console command ifreload not touching this if we change mtu in /etc/network/interfaces .
Click to expand...
yes, this is expected, tap interfaces are not manage by ifupdown or in /etc/network/interfaces.

proxmox create and plug them at vm startup (and set mtu at vm startup).
so you can't juste "update" mtu on /etc/network/interfaces , you also need to stop/start vms (or live migrate them)
 
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