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How do I configure two IP addresses on a specific vlan

rated 0 times [ 4] [ 0] / answers: 1 / hits: 10142 / 3 Years ago, fri, november 26, 2021, 8:26:03

I'm not sure about the syntax here: what comes first in /etc/network/interfaces interface names, VLAN or alias? What I want is to setup two different subnets on the same VLAN (temporarily).

It will look something like below, where there's a 10.20.100.100/24 and 10.20.200.200/24 on the same VLAN (id 33):

iface eth0:1.33 inet static

  address 10.20.100.100

  netmask 255.255.255.0



iface eth0:2.33 inet static

  address 10.20.200.200

  netmask 255.255.255.0

I expected the Debian Wiki to answer this but it did not: https://wiki.debian.org/NetworkConfiguration#Multiple_IP_addresses_on_One_Interface

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oraoming

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3 Years ago

answered 3 Years ago antoccasiona · Accepted Answer

I don't know when and what changed, but you can now define virtual interfaces on vlans:

auto eth0.10

iface eth0.10 inet static

    address 192.168.1.61

    netmask 255.255.255.0

    gateway 192.168.1.11



auto eth0.10:1

iface eth0.10:1 inet static

    address 10.20.100.100

    netmask 255.255.255.0



auto eth0.10:2

iface eth0.10:2 inet static

    address 10.20.100.200

    netmask 255.255.255.0

Think of vlan interfaces as physical interfaces. You add virtual interfaces to the "physical" interface.