Two Ethernet Adapters/Interfaces on Debian 12

[rand0user]

Debian 12

I have a gigabyte AMD motherboard with onboard lan. I added a 10Gb SFP+ PCI-E Network Card to the computer. I have two networks, LAN w/ VPN and naked LAN.

When both ports are unplugged and I plug in ONE cat5 cable, I get the right IP address (whichever cable I plug in). But when I plug in the 2nd cable, an IP address doesn't pull up on the interface. It shows the cable plugged in broadcasting but doesn't get an address. I installed broadcom-sta-dkms for the nic card driver. Both eth work, both cables work and both networks are online.

How do I get both interfaces working at the same time?

Thanks

[arzgi]

If you use network manager, it does not enable two network interfaces at the same time. Network manager is not mandatory, I have never used that. So your scenario is possible, but your network interfaces can not be in the same network, which you seem to try.

[rand0user]

Is there a way to override and enable them? is there another service that can do this?

thanks

[Aki]

Hello @rand0user,

Please describe:

• what is the network connection you want to configure using the two network cards

• what are the existing networks you want to connect and their topology

• how the current network hardware is recognized by debian; you can use the command (the inxi program must be installed):

  Code: Select all

  $ inxi -n
  

Hope this helps.

[rand0user]

I have a NIC with two SFP+ slots. the motherboard also has onboard lan. I have an network router operating a lan with vpn. But before that there is a cable router. I want to be able to go from the cable modem (that has a lan without vpn) into the tower operating as a server and host my nextcloud, searx and some other stuff so I can access it remotely with DDNS and DMZ.

I need to bring up two interfaces, one for outgoing traffic and one for hosting traffic. are there other network managers that can bring up two interfaces? it looks like ifupdown is one of the solutions according to grok. we'll see

thanks in advanced.

[Aki]

Hello,

I have an network router operating a lan with vpn. But before that there is a cable router. I want to be able to go from the cable modem (that has a lan without vpn) into the tower operating as a server and host my nextcloud, searx and some other stuff so I can access it remotely with DDNS and DMZ

I am assuming that the multiple topics quoted above are not part of the current discussion.

[..] can bring up two interfaces? it looks like ifupdown is one of the solutions [..]

The ifupdown package should be able to do it [1].

You need to know the network configuration parameters (interface IP address, netmask, gateway IP address, dns-nameservers IP address) for the two network interfaces to set up manually the configuration file named /etc/network/interfaces . The networks connected to the two network interfaces must be independent, of course.

--
[1] https://wiki.debian.org/NetworkConfiguration

[CwF]

How do I get both interfaces working at the same time?

If both connect to the same external dhcp server then the simple answer is to segregate the task/interface/OS with virtual machines. That would be far simpler and more reliable than trying to segregate process per interface within a single OS.