ZyXEL Communications ADSL2+ 4-port Security Gateway Support Notes page 70

P-662H-D Series Support Notes
The P-662H-D supports three virtual LAN interfaces via its single physical
Ethernet interface. The first network can be configured in Web Configurator,
Advanced Setup, Network -> LAN -> DHCP Setup. The second and third
networks that we call 'IP Alias 1' and 'IP Alias 2' can be configured in
Network -> LAN -> IP Alias.
There are three internal virtual LAN interfaces for the P-662H-D to route the
packets from/to the three networks correctly. They are enif0 for the major
network, enif0:0 for the IP alias 1 and enif0:1 for the IP alias 2. Therefore,
three routes are created in the P-662H-D as shown below when the three
networks are configured. If the P-662H-D's DHCP is also enabled, the IP pool
for the clients can be any of the three networks.
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