Allied Telesis AT-WL2411 - Manual (Page 92)

AT-WL2411 Installation and User’s Guide
92
IP Addressing
for End Devices
IP end devices must be assigned IP addresses that are on the home IP
subnet. There are no address restrictions for non-IP end devices.
Using Non-IP
Protocols
Servers that use a routable network protocol such as IP or IPX may be
located on any subnet; however, triangular routing can be minimized if
servers are located on the home IP subnet. (Note that this is also true for
standard mobile IP.) You should be able to use default flooding and
bridging settings if you are using routable protocols, even if servers are
located on remote IP subnets.
The NNL protocol is a simple Non-routable Network Layer protocol that
is used to carry high-layer data in a local area network environment. An
NNL gateway forwards NNL traffic to non-NNL hosts such as TCP/IP
hosts. You can use the default flooding and bridging settings, and
minimize triangular routing, if NNL gateways are located on the home
subnet. If NNL gateways are located or remote subnets, you must enable
outbound multicast flooding and secondary bridging.
Frame
Forwarding
Any data packet sent through an IP tunnel is addressed to the unicast IP
address of the access point at the other end of the tunnel. An access
point at the remote end of the tunnel learns the unicast IP address of the
root access point by listening to IP hello packets. The root access point
learns the unicast IP address of a remote access point when the access
point attaches to the network.
Usually, ARP requests (which are multicast packets) that originate on the
home IP subnet are forwarded outbound to all devices on the network,
including through IP tunnels to remote IP subnets. If you configure the
access point as an ARP server, ARP packets are only sent through the IP
tunnel to the destination end device.
Unicast frames are only forwarded outbound through an IP tunnel if the
destination address identifies an end device that has roamed to a
remote IP subnet. Usually, wireless traffic is not bridged to remote IP
subnets and traffic from a remote IP subnet is never forwarded inbound
through an IP tunnel.
MAC frames originating on the home IP subnet are encapsulated in the
root access point, forwarded through the IP network, unencapsulated by
the access point at the remote end of the IP tunnel, and forwarded to the
appropriate access point (if necessary) for delivery to the destination
end device. For inbound frames, the same process is used in reverse
between the access point at the remote end of an IP tunnel and the root
access point.