[SOLVED] The network is not up

Jason.nix · 11-22-2023, 06:00 AM

Hello,
My Debian box has three NICs:

Code:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: Client: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 34:60:f9:cc:2e:8b brd ff:ff:ff:ff:ff:ff
3: Server: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 34:60:f9:d4:92:06 brd ff:ff:ff:ff:ff:ff
4: Control: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 08:62:66:c8:c3:e8 brd ff:ff:ff:ff:ff:ff
    altname enp0s25

I want to manually set the IP address of the NIC named Control. I added the following lines to the interfaces file:

Code:

auto Control
iface Control inet static
address 172.21.50.28
netmask 255.255.255.128
broadcast 172.21.50.127

After it, the network is not up.

Thank you.

michaelk · 11-22-2023, 06:48 AM

debian uses network manager to configure networking. To use the interfaces file you need to stop/disable network manager and start/enable networking service.

You can configure static ip settings with network manager using the utility nmcli or via its desktop applet.