I have supermicro board x9dai with 2 NICs.

one is automatically used  by unRaid .

the second one I never connected.  

 

I would like to be able to connect my laptop to this second NIC same as if I were to connect to the router.  

for this I presume I need to have a bridge between them. 

 

how can I do that please?

 

Edited September 11, 20187 yr by dadarara

Configure the interface eth0 as bridge and add interface eth1 as member.

This allow your Unraid server to act as switch (passthrough) to your router.

cant seem to understand what I am doing wrong.  but its not working.

the eth0 is already a bridge

but when I connect to second port I dont get IP from the DHCP

For eth0:

- Enable bonding = No

- Enable bridging = Yes

- Bridge members = eth0, eth1

 

For eth1 (will get automatically added to the eth0 bridge)

- Enable bonding = No

- Enable bridging = No

 

worked after a few reboots.

 

another Q if I may.   what would be the best MTU value speed wise ?   is it something I need to experiment and its my network specific ?

also,

what does the bellow mean ?

 

Tower kernel: br0: port 1(eth0) received tcn bpdu
Sep 9 10:32:24 Tower kernel: br0: topology change detected, propagating
Sep 9 10:32:47 Tower kernel: br0: port 1(eth0) received tcn bpdu
Sep 9 10:32:47 Tower kernel: br0: topology change detected, propagating

38 minutes ago, dadarara said:

worked after a few reboots.

 

another Q if I may.   what would be the best MTU value speed wise ?   is it something I need to experiment and its my network specific ?

If your network is gigabit speed, it is best to leave MTU on its default size of 1500 bytes. No real advantages when making MTU bigger.

For 10 Gbps links it can give improvement to set the largest MTU size supported by all devices, usually 9000 bytes. To make this work properly your systems, router and switch all need to be configured to support so called jumbo frames. Pay attention because not every device does support jumbo frames or uses a different max size. If unsure leave MTU at default of 1500 bytes.

28 minutes ago, dadarara said:

what does the bellow mean ?

Because you have two links in the bridge on your system, it has automatically the "spanning tree" protocol enabled. This protocol discovers your network topology and prevents layer 2 loops from occuring (when such a loop should occur, it does overload your network and brings it to stand still).

The messages you see are expected.