VLAN and LAN on Interface
It is useful to have LAN(default) and VLAN on the same Interface, so you can have one uplink from your switch, at this time you need 2 cables to connect your switch.
Marcus Hock commented
Hi, isn't this what is the common us of a native VLAN? In respect of 802.1q, every VLAN-Trunk should be able to deal with one native (untagged) VLAN. I am really curious why sophos does not implement the correct standard?!
In my optionion, the thinking of this is to different between extern and internal traffic. Over this way, users are coerced to difference beween internal and external traffic.