DHCP server not found: autoconfiguration IP addr.

From: Dave (anonymous_at_discussions.microsoft.com)
Date: 02/11/04 

Date: Tue, 10 Feb 2004 18:56:50 -0800

This is hard, I challenge you!! I keep having this
repeated problem on several machines and several different
configurations at different times. Basically, when I
change something major, like add a new network interface
card, I cannot talk to anything: the new interface cannot
find the DHCP server, and Windows (demonstrated on XP and
2000) uses a autoconfiguration IP address (169.something).
I have searched everywhere and cannot find a reasonable
explanation for what is happening. Here are my different
circumstances:

(1) laptop (Win 2000) connected directly to cable modem,
all is good: internet connection works fine. I moved the
cable from the laptop to my desktop (XP): the desktop does
not obtain an IP address resulting in no communication
with anything. IP address is 169 address and upon
ipconfig /renew, the error DHCP server not found results.
See below for ipconfig output. The fix for this case was
to power cycle the cable modem.

(2) I installed a wireless router, and everything was fine
using the wired connection with the same NIC. I installed
a wireless NIC. The wireless link came up no problems.
Same results as in #1: no IP address, autoconfiguration IP
assigned, DHCP server not found. Fix for this case:
research problem for 2 days, come back to computer to try
a few things and boom, IP address is fine 192.168.0.x
through router and all is good.

(3) Totally separate network at work: new computer wired
into ethernet drop in my office ... everything fine (DHCP
assigned address, all comm good). Moved this computer to a
lab where I connect same NIC to 8 port switch that
ultimately gets to a router on the same company network.
Same result as #1 and #2: no IP address, autoconfiguration
IP assigned, DHCP server not found. Fix for this case:
assigned a static IP and I can talk to router (this didn't
work for other cases).

There MUST be a common thing happening here, but I haven't
found a good explanation for it. It was explained to me
that in case #1 that the modem associated the MAC address
of the original laptop with itself (or something like
that) and it needed to be powered cycled. What is this
association (ARP cache on the modem?)? Is a similar thing
happening in the other cases?

I would appreciate any and all help!!! This one keeps
coming back to me and yet there is nothing I can do about
it each time it happens!! THANK YOU!

Here is the similar output for each case of ipconfig /all,
ipconfig /renew, and arp -a:

C:\>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : viper
Primary DNS Suffix . . . . . . . : xxx.xxx.com
Node Type . . . . . . . . . . . . : Broadcast
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : xxx.xxx.com
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network
Connection
Physical Address. . . . . . . . . : AA-BB-CC-DD-EE-FF
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Autoconfiguration IP Address. . . : 169.254.235.62
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . :

C:\>ipconfig /renew

Windows 2000 IP Configuration

The following error occurred when renewing adapter Local
Area
Connection:
DHCP Server unreachable

C:\>arp -a
No ARP Entries Found

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