Submit Hint Search The Forums LinksStatsPollsHeadlinesRSS
14,000 hints and counting!


Click here to return to the 'What actually makes this work?' hint
The following comments are owned by whoever posted them. This site is not responsible for what they say.
What actually makes this work?
Authored by: crispyking on Aug 26, '04 07:20:22PM

Right, I'm running my own DHCP server on my LAN, but if you're not running a DHCP server, you should be able to set the IP address manually in the Network System Preferences.

There are two tricks that make this work. The first isn't much of a trick: you just configure the wireless AP to be a simple LAN bridge. It simply bridges ethernet traffic between the LAN and the wireless network, so it basically operates transparently like a hub or switch. I would think you could do this with any wireless AP.

The second trick is to configure the wireless interface to have the same IP address as the wired one. This is the real trick since you're really not supposed to configure more than one interface on a given subnet. It's a bit of a hack since all the other machines on the LAN see the MAC address changing for that IP address and complain in the log file in case it's a spoofing attempt. But they change their ARP caches anyways and everything continues to work. It's the fact that Mac OS X allows you to set the same IP address for multiple interfaces that makes this work.



[ Reply to This | # ]
It's not as complicated as you think...
Authored by: jtrott on Aug 27, '04 04:17:27AM

I don't think you actually need to do any configuration on the DHCP server at all. I've been using the same setup (moving from lan to wireless without dropping connections) for a while now. The secret is to set your DHCP Client ID to the same on both interfaces. As an aside, if you set it to the same as in your Sharing control panel and make it a single word with just letters and numbers (no spaces), the DHCP server will record your client name and correctly configure dyndns (if you have it setup).
In short, make your DHCP Client ID the same on both interfaces and make the Sharing Computer Name the same again to make sure that the DHCP client name is recorded correctly on the DHCP server. There is no need to mess with the DHCP server configuration.
HTH,
JT



[ Reply to This | # ]
It's not as complicated as you think...
Authored by: crispyking on Aug 27, '04 12:08:21PM

It depends on the situation. I tend to prefer making changes on my DHCP server so I don't have to mess around with each client machine's settings :-)



[ Reply to This | # ]
It's not as complicated as you think...
Authored by: jtrott on Aug 30, '04 07:40:24AM

Well, I prefer to change my iBook setup, rather than all the DHCP servers I come in contact with in a normal work day :)
To each their own I guess ;)
JT



[ Reply to This | # ]