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For my system with a Sun Cassini Quad-NIC the command

ip link set dev eth0.100 up

doesn't work, it always says "Network unreachable". I think this has to be

ip link set dev eth0 up

as you have to up the interface, not the VLAN. Tomtom (talk) 20:10, 9 May 2014 (UTC)

Sounds OK to up a VLAN device, but it should probably be created first.
I would try
ip link add link eth0 name eth0.100 type vlan id 100
before the "up".
ip link set dev eth0.100 up
Seems to work with similar commands on my config.
RegisC (talk) 21:24, 11 May 2014 (UTC)

Interface Naming

I think it'd be helpful to replace the interface names (e.g. eth0) with new systemd device names (e.g. wwp0s20u4c2i12). The new names are definitely more verbose, but more accurately reflect the current state of networking on Arch systems. Zeal J. (talk) 16:54, 2 April 2015 (UTC)

I'm neutral on the matter; your argument is sound, but eth0/wlan0 is easy to keep consistent across articles. In either case, pseudo-variables should be added. -- Alad (talk) 18:41, 2 April 2015 (UTC)