ISC DHCP jsut broke

[tekkie123]

ISC DHCP v3.0.3 running on a MacMini under OS X Tiger.
Ran fine for years.
Suddenly, most of my PCs can't get a valid Address.
When I go to the PC with a problem, this is the routine:

>ipconfig/all
IP: 10.0.1.130
SN: 255.255.255.0
GW: 10.0.1.1
>ipconfig/release
success
>ipconfig/renew
IP: 10.0.1.130
SN: 255.255.255.0
GW: 10.0.1.1
>ipconfig/release
success
>ipconfig/renew
The following error occurred when renewing adapter Local Area Connection 2: unexpected network failure or insufficient access
>ipconfig/renew
IP: 10.10.17.223
SN: 255.255.0.0
GW: 10.10.1.1

and then all is good. here's the dhcpd.config

default-lease-time 259200;
max-lease-time 259300;
ddns-update-style none;
authoratative;
option subnet-mask 255.255.0.0;
option domain-name-servers 10.10.1.3;
option domain-name "mydomain.org";

subnet 10.10.0.0 netmask 255.255.0.0 {
option broadcast-address 10.10.255.255;
option routers 10.10.1.1;
range 10.10.13.1 10.10.13.254;
range 10.10.14.1 10.10.14.254;
range 10.10.15.1 10.10.15.254;
range 10.10.16.1 10.10.16.254;
range 10.10.17.1 10.10.17.254;
range 10.10.18.1 10.10.18.254;
}

 

[GunnarD]

When you do "ipconfig /all" then you can see the adress of the dhcp-server who is given out that adress, is that the adress of your dhcp-server?

 

[tekkie123]

I didn't check. Let me find out. But my understanding is that the 10.0.x.x address is some default the machine uses when it cannot get an address from the DHCP server.

 

[tekkie123]

>ipconfig/all

usual blah blah
Phys addr: usual stuff
DHCP enabled: Yes
Autoconfig enabled: Yes
IP: 10.0.1.125
SN: 255.255.255.0
DG: 10.0.1.1
DHCP SVR: 10.0.1.1
DN SVRS: 10.0.1.1
Lease obtained: Tue June 10, 08 6:30:11 AM
Lease expires: Tues June 10, 08 10:30:11 AM

this only appears to happen once per machine. that is, the ones that I fixed yesterday appear fine today.

 

[GunnarD]

Default for a windows machin that does not get a DHCP adress is 169.*.*.*.

What i can see is that you have another DHCP server in your network (at address 10.0.1.1), try to find that machine.

On the client type "arp -a" the you should se what mac-adress 10.0.1.1 has and try to trace it in you switches.

 

[tekkie123]

Thank you GunnarD. It was an Apple 802.11n Airport which, out of the box, we couldn't connect to with the utility sw to config it. Apparently, it begins handing out IPs out of the box, or maybe it's just munged. We're good now.