Intermittent DHCP Issue

May 2, 2011 at 11:23:43
Specs: Windows (several versions), N/A
Our home wireless network utilizes a US Robotics router connected directly to the DSL modem. On the wireless side we have two desktop computers (XP & Vista), two XP laptops, two Netbooks (XP and Win7), a Wii, Roku box and a Canon printer, all sharing the network... not always at the same time, of course, but at least two or three wireless connections at any one time. These each use their own built-in wireless adapters, except for the older desktops that have USB wireless adapters.

Surprisingly, most of the time everything is just fine, but every other day or so, one device does not get a DHCP assignment when it boots up. The computer shows good signal and proper SSID, but only 'local' or 'limited' connectivity. Doing a Windows 'Repair' or rebooting the computer does not help at all, it takes a trip to the attic to reboot the router, which always brings things back into operation.

This is an unprotected (no encryption) network, and the DHCP lease time is the default 6 hours. Other router setup parameters are the default values as well, including a generous range of IPs that the router can assign to wireless clients.

A friend with a different rounter has this problem occasionally also; any help is much appreciated.


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#1
May 2, 2011 at 11:27:16
6 hrs is a pretty short period of time for dhcp renewal
I would suggest you set it to a least 24 hrs.
Review the dhcp scope and that it contains enough ip addresses for all of your devices on at the same time.

You could just do static assignments to all of your devices and disable dhcp on the router.
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#2
May 2, 2011 at 11:50:39
Thanks, Wanderer,

I went in and changed the lease time to 24 hours; we'll see if that helps. The assignment range is from 192.168.2.2 to 192.168.2.100, which ought to be enough. The assignments are always at the bottom of the range. The manual assignments might be an idea, but would thwart friends (and not!) who want to camp onto the network. Also, not sure how to make those assignments with 'consumer' gear like the Wii and Roku.


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#3
May 2, 2011 at 12:35:19
wii has a network setup screen. Most likely the same for Roku

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#4
August 12, 2011 at 14:13:23
This problem was solved by replacing the wireless router with another one. Haven't had a similar problem with the new router in months. Thanks to all for the help, however.

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#5
August 12, 2011 at 15:24:44
Thank you for the update. Always nice to know how it worked out.

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