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DHCP Woes

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Trauts   05-04-2005 at 04:17:55 AM

I need to do port forwarding to my laptop, and thus I have set up a static IP address for it, based on the MAC address of the wired ethernet card.

However, when it is wireless, I get a different IP address, as the wireless card's IP is different.

Is there a way I can get this IP to be the same?

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Riser   05-04-2005 at 02:53:24 PM
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Create a reservation for the IP address in DHCP, hard code each network connection to the IP address. It shouldn't conflict because only one will work at a time.

Riser

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Trauts   05-07-2005 at 02:05:31 AM
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I don't quite understand.

Here's what I tried doing:

I manually configured the wired connection on my laptop to 192.168.0.100, and had the router assign by DHCP the same IP. If I take the laptop from the docking station, the router doesn't seem to realize i have removed the computer. Then, when the router wants to assign that IP to the wireless adapter, it thinks it is already connected :S

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Riser   05-09-2005 at 03:12:07 PM
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Shorten your DHCP length time then..
In DHCP you can create a reservation.. right click or go under reserverations and you should be able to figure out how to make one.

You'll probably be better off using an IP address not in your DHCP range. Like 192.168.0.99 and configure both use that IP as static.

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palmerg   05-09-2005 at 11:08:06 PM
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One way to do this is to get a device (router) that supports Static DHCP. That allows the same IP address to be issued to some number of MAC addresses (which if you don't do it carefully will cause all sorts of problems). Some D-Links (like the DL-624) have this capability. Natively the current Linksys batch doesn't but some routers (like the WRT54G & GS)can be flashed with a very robust router product from Sveasoft (alchemy I think) that gets you Unix IPTables capability. That costs about $20.00 a year though.

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kwebb   05-10-2005 at 02:59:52 PM
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Spoof the MAC on the wireless card to match the wired MAC address and assign it the same static IP as the wired client. Now if both these network interfaces are active you'll get ugly pop ups about IP conflicts. You could always just disable the interface not in use.

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umheint0   06-23-2005 at 06:45:27 PM
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There are a lot of suggestions here, but the easiest would be to manually set both adapters to the same IP address, and have the gatway forward to that specific IP. Then, only connect one device at a time. Your router should be able to support static addressing for the wireless connection. Just make sure you get rid of any previous lease to the wireless adapter to make sure it works properly.

The other way would be to do the reverse. Set the lease length to infinite. Have the gateway assign an IP to your wireless adapter. Then forward the ports to your wireless adapter. Then statically set your wired adapter to that IP in the tcp/ip settings.

umheint0's phat setup --> <A HREF="http://home.cc.umanitoba.ca/~umheint0/system.html" target="_new">http://home.cc.umanitoba.ca/~umheint0/system.html</A><--<P ID="edit"><FONT SIZE=-1><EM>Edited by umheint0 on 06/23/05 12:48 PM.</EM></FONT></P>

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