 Re: DHCP Server Leasing Addresses to MAC Addresses of 00-00-00-00-00-00
"Noozer" <dont.spam@me.here> wrote in
news:jdmdh.424332$1T2.119713@pd7urf2no:
>
> "nomorespameventhoughthejapanesespamgivesmeachuckl e"
> <nousenetspam@gmail.com> wrote in message
> news:1165353026.732081.173170@j44g2000cwa.googlegr oups.com...
>> I'm using a Draytek DSL Modem/Router which is acting as a DHCP
>> server.
>>>From this connections are made to a Linksys WRT54G and a separate
>>
>> connection to Server 2003 with a dual-NIC setup for hosting XP
>> clients. I also have Server 2003 as a DHCP server for a specific
>> subnet of XP clients that are internal to the business. I also
>> have separate connections from the modem/router that go to a Linux
>> box and still more connections to external client computers. Now
>> when I connect the client computers I'd like the DHCP server to
>> lease them an address but as you can see in the following log, the
>> server gives out every available lease after a short amount of
>> time. In order to clear the active DHCP sessions I have to reboot
>> the server; then I can lease an address to a client computer (as
>> you can see by the second leased address with the Host ID. After a
>> few hours though the list looks like below.
>>
>> Any ideas on what's going on?
>>
>> Any ideas on maybe a better group to post this to?
>>
>> DHCP server: Running
>> Index IP Address MAC Address Leased Time
>> HOST ID 1 192.168.1.1 00-50-75-1E-63-60 ROUTER IP
>> 2 192.168.1.210 00-15-F3-9B-FA-34 0:13:57.340
>> Client-Desktop
>> 3 192.168.1.211 00-00-00-00-00-00 0:20:40.390
>> 4 192.168.1.212 00-00-00-00-00-00 0:20:40.440
>> 5 192.168.1.213 00-00-00-00-00-00 0:20:42.380
>> 6 192.168.1.214 00-00-00-00-00-00 0:20:42.430
>> 7 192.168.1.215 00-00-00-00-00-00 1:20:44.520
>> 8 192.168.1.216 00-00-00-00-00-00 1:20:44.570
>> 9 192.168.1.217 00-00-00-00-00-00 1:20:46.500
>> 10 192.168.1.218 00-00-00-00-00-00 1:20:46.550
>> 11 192.168.1.219 00-00-00-00-00-00 2:20:48.390
>> 12 192.168.1.220 00-00-00-00-00-00 2:20:48.440
>> 13 192.168.1.221 00-00-00-00-00-00 2:20:50.390
>> 14 192.168.1.222 00-00-00-00-00-00 2:20:50.440
>> 15 192.168.1.223 00-00-00-00-00-00 3:20:52.380
>> 16 192.168.1.224 00-00-00-00-00-00 3:20:52.430
>> 17 192.168.1.225 00-00-00-00-00-00 3:20:54.380
>> 18 192.168.1.226 00-00-00-00-00-00 3:20:54.430
>> 19 192.168.1.227 00-00-00-00-00-00 4:20:56.400
>> 20 192.168.1.228 00-00-00-00-00-00 4:20:56.450
>> 21 192.168.1.229 00-00-00-00-00-00 4:20:58.410
>
> You have a defective NIC on your network someplace, or a damaged
> driver. (Drivers let you specify your own MAC in their
> configuration).
>
> If that's not the case, then you have some rogue software on a PC
> someplace making all these requests. At least the requests happen on
> a schedule and you can disconnect PC's from the network one at a
> time to find the offender.
Is 00-00-00-00-00-00 even a legal MAC address? If not then I would
question the router for giving out a lease to that MAC address.
Another question I have is, how does DHCP work with regard to multiple
IP addresses for the same MAC? Should the DHCP server be releasing the
old IP when the same NIC requests a new IP or is there a different
mechanism for requesting multiple IPs vs. renewing the IP? I ask this
because, though I can give my NICs multiple static IPs, I don't see how
to get multiple dynamic IPs (but maybe this is just another Windows
shortcoming).
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