June 2003
Intermediate to advanced
184 pages
5h 8m
English
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Bridging
A big disadvantage to running NAT on your wireless hosts is that they become less accessible to your wired hosts. While the wireless users can make connections to any machine on the wire, connecting back through a NAT is difficult (the AirPort provides some basic support for this by allowing for static port mappings, but this is far from convenient). For example, if you are running a Windows client on the wireless, the Network Neighborhood will show other wireless clients only and not any machines on the wire, since NAT effectively hides broadcast traffic (which the Windows SMB protocol relies on). If you already have a DHCP server on your wired network, and are running private addresses, the NAT and DHCP functions of the AirPort are redundant, and can simply get in the way.
Rather than duplicate effort and make life difficult, you can disable NAT and DHCP and enable bridging to the wire. Turn off DHCP under DHCP Functions (as we saw previously), and check the Act as transparent bridge (no NAT) under the Bridging Functions tab. When the AirPort is operating in this mode, all traffic destined for your wireless clients that happens on the wire gets broadcast over wireless, and vice versa. This includes broadcast traffic (such as DHCP requests and SMB announcement traffic). Apart from wireless authentication, this makes your AirPort seem completely invisible to the rest of your network.
Once bridging is enabled, you may find it difficult to get the unit back into NAT mode. If ...
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