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Tunnels
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The two ETUN'ed ports will behave as if they were two ports on a single link layer 2 hub or switch, apart from
the extra latency introduced by the carrier network traversal. It is important to note that *all* ethernet packets
are transported. This includes ethernet broadcast packets, ARP packets and also any non-IP traffic (eg IPX,
old NetBIOS/NetBEUI etc) so care should be taken to ensure that such traffic does not overload the carrier
network. In addition the extra latency may cause problems with devices expecting LAN-speed responses - for
example switches running LACP.
Configuring an ETUN connection is very simple. Select "Add: New: Ether tunnel (RFC3378)" on the tunnel
configuration page, and enter the IP of the remote Firebrick and the local port to be used for ETUN. The local
IP can be optionally set, and the usual log, profile and table options are also available. The local ETUN port is
specified by selecting a port group. The selected group must have only one physical port, and must not be used
for any other purpose, so must not be used in any other configuration entries.
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