Chapter 28. Reusing the same IP address on different interfaces

Procedure

1. Create and configure the first VRF device:

   1. Create a connection for the VRF device and assign it to a routing table. For example, to create a VRF device named vrf0 that is assigned to the 1001 routing table:

      # nmcli connection add type vrf ifname vrf0 con-name vrf0 table 1001 ipv4.method disabled ipv6.method disabled

      Copy to Clipboard Toggle word wrap

   2. Enable the vrf0 device:

      # nmcli connection up vrf0

      Copy to Clipboard Toggle word wrap

   3. Assign a network device to the VRF just created. For example, to add the enp1s0 Ethernet device to the vrf0 VRF device and assign an IP address and the subnet mask to enp1s0, enter:

      # nmcli connection add type ethernet con-name vrf.enp1s0 ifname enp1s0 controller vrf0 ipv4.method manual ipv4.address 192.0.2.1/24

      Copy to Clipboard Toggle word wrap

   4. Activate the vrf.enp1s0 connection:

      # nmcli connection up vrf.enp1s0

      Copy to Clipboard Toggle word wrap

2. Create and configure the next VRF device:

   1. Create the VRF device and assign it to a routing table. For example, to create a VRF device named vrf1 that is assigned to the 1002 routing table, enter:

      # nmcli connection add type vrf ifname vrf1 con-name vrf1 table 1002 ipv4.method disabled ipv6.method disabled

      Copy to Clipboard Toggle word wrap

   2. Activate the vrf1 device:

      # nmcli connection up vrf1

      Copy to Clipboard Toggle word wrap

   3. Assign a network device to the VRF just created. For example, to add the enp7s0 Ethernet device to the vrf1 VRF device and assign an IP address and the subnet mask to enp7s0, enter:

      # nmcli connection add type ethernet con-name vrf.enp7s0 ifname enp7s0 controller vrf1 ipv4.method manual ipv4.address 192.0.2.1/24

      Copy to Clipboard Toggle word wrap

   4. Activate the vrf.enp7s0 device:

      # nmcli connection up vrf.enp7s0

      Copy to Clipboard Toggle word wrap

Procedure

1. Create and configure the first VRF device:

   1. Create the VRF device and assign it to a routing table. For example, to create a VRF device named blue that is assigned to the 1001 routing table:

      # ip link add dev blue type vrf table 1001

      Copy to Clipboard Toggle word wrap

   2. Enable the blue device:

      # ip link set dev blue up

      Copy to Clipboard Toggle word wrap

   3. Assign a network device to the VRF device. For example, to add the enp1s0 Ethernet device to the blue VRF device:

      # ip link set dev enp1s0 master blue

      Copy to Clipboard Toggle word wrap

   4. Enable the enp1s0 device:

      # ip link set dev enp1s0 up

      Copy to Clipboard Toggle word wrap

   5. Assign an IP address and subnet mask to the enp1s0 device. For example, to set it to 192.0.2.1/24:

      # ip addr add dev enp1s0 192.0.2.1/24

      Copy to Clipboard Toggle word wrap

2. Create and configure the next VRF device:

   1. Create the VRF device and assign it to a routing table. For example, to create a VRF device named red that is assigned to the 1002 routing table:

      # ip link add dev red type vrf table 1002

      Copy to Clipboard Toggle word wrap

   2. Enable the red device:

      # ip link set dev red up

      Copy to Clipboard Toggle word wrap

   3. Assign a network device to the VRF device. For example, to add the enp7s0 Ethernet device to the red VRF device:

      # ip link set dev enp7s0 master red

      Copy to Clipboard Toggle word wrap

   4. Enable the enp7s0 device:

      # ip link set dev enp7s0 up

      Copy to Clipboard Toggle word wrap

   5. Assign the same IP address and subnet mask to the enp7s0 device as you used for enp1s0 in the blue VRF domain:

      # ip addr add dev enp7s0 192.0.2.1/24

      Copy to Clipboard Toggle word wrap
3. Optional: Create further VRF devices as described above.