Re: Windows loses DNS capability periodically - reboot fixes

you should double check the vendor website to make sure that the
firmware you list against the latest. DHCP reservation - always
given the same IP - is the one you should use (but it still won't be
infinite so set the lease time to the longest one possible).

the other thing is that the router may have stopped proxying DNS
requests. find out the DNS servers used by your ISP (they ay appear
on the router config pages) and enter them in the computer TCP/IP
config as static DNS servers.

On Sun, 21 Oct 2007 15:56:00 -0700, Walter M
<WalterM@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Many thanks for taking an interest in this. I feel that now I've got some
clues I should be researching this off my own bat.. But, since you're
there...(!)

I only have a single device - a desktop PC - attached to the router - a
Thompson Speedtouch - Release 6.1.4.6 . I do see in Router Configuration an
option against IP Address to "Always use the same IP Address". So presumably
I should try this?

[The manual actually seems a bit out of synch with the firmware - it
indicates that you can set a similar flag against the "DHCP" pool to "Always
give same address to DHCP clients", which will set the "lease time" to
infinite, or set specific values for the "lease time" - but these I can't in
fact find any way to do.]

But am I right to suppose that something has, in a sense, broken? I don't
understand why I'd never even been aware of "leases" before, and how this has
become a problem, granted a minor one, only for the last two weeks.. You
mentioned "DHCP OFFER" messages from the router - are these in general
triggered every few seconds/minutes, or only as the lease comes close to
expiry? And is there any logging anywhere that would show them? Or is the
"lease" usually infinite, in fact?

Regards

Walter

"Barb Bowman" wrote:

if your computer was turned off/hibernating etc., the lease may
expire when it is in this state. a better driver for you NIC might
fix this (and/or a firmware upgrade for your router), and you can
also set the lease time on most routers to be a longer period in the
admin pages (which will certainly make this happen less often). If
you don't have a lot of computers on your network, you could set for
the longest time possible. Still if there is an issue with the
computer receiving DHCP OFFER messages from the router or if the
router isn't sending them properly, this could continue.

what router model and hardware revision and what firmware version?
--

Barb Bowman
MS Windows-MVP
http://www.microsoft.com/windowsxp/expertzone/meetexperts/bowman.mspx
http://blogs.digitalmediaphile.com/barb/
.

Relevant Pages

  • Re: DHCP addresses on LAN
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    (comp.sys.mac.comm)
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    ... Unfortunately (or maybe fortunately, since the firmware on my router was updated a few months ago), the MAC address in question is a PC, not the router as it was in his case. ... Everyone but the server uses DHCP ...
    (microsoft.public.windows.server.sbs)
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    ... Fixed IP addresses should be no problem in your case, what I think is that there are some problems with the master browser service on your network. ... Lease time should be irrelevant because ALL of the machines and the router get shut down every night. ... It recognizes the second machine if it's dhcp but not if the second machine is fixed IP. ...
    (microsoft.public.win2000.networking)
  • Re: static IPs for linksys wrt54g wireless router.
    ... DHCP server in the router. ... some routers let you set the DHCP lease time to infinity. ... the mac correspondence is lost. ...
    (alt.internet.wireless)
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