DHCP issues

  • Thread starter Thread starter teamgig
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teamgig

Greetings,

A couple of days ago, I started experiencing intermittent internet
connectivity on all of the computers in my home. Symptoms include
having to try multiple times to get to a web page, or periods of
several minutes with no connectivity at all, and drops of the VPN into
my work network.

I have power-cycled all of the equipment -- cable modem, routers,
computers -- several times. The ISP reports no issues or problems on
their end. In Event Viewer on all the PC's, there are many DHCPNACK
errors of the type shown below. On one computer, for example, I have
67 of these in the last 24 hours. These started occuring right when
the symptoms began (6:15 AM on Saturday), and the previous such event
was logged more than three months prior.

The IP address lease 192.168.1.102 for the Network Card with network
address 001D60720A5F has been denied by the DHCP server 192.168.1.1
(The DHCP Server sent a DHCPNACK message).

I'm not sure why the router would suddenly start sending these. Any
suggestions on how to diagnose or proceed would be appreciated.
 
Open your Ethernet card Properties in Device Manager (devmgmt.msc) The speed
setting is probably 'auto-negotiate' I suggest trying a few manual speed
settings, starting at 10mbps half-duplex and working up, to see if that
kicks the connection into working.
People with this problem often are using an exceptionally fast machine. Long
wires, not using 802.11'n', several other router issues. I have seen it for
quite a few different reasons. (The guy on the other end may have upgraded
to Vista :) )
 
Greetings,

A couple of days ago, I started experiencing intermittent internet
connectivity on all of the computers in my home. Symptoms include
having to try multiple times to get to a web page, or periods of
several minutes with no connectivity at all, and drops of the VPN into
my work network.

I have power-cycled all of the equipment -- cable modem, routers,
computers -- several times. The ISP reports no issues or problems on
their end. In Event Viewer on all the PC's, there are many DHCPNACK
errors of the type shown below. On one computer, for example, I have
67 of these in the last 24 hours. These started occuring right when
the symptoms began (6:15 AM on Saturday), and the previous such event
was logged more than three months prior.

The IP address lease 192.168.1.102 for the Network Card with network
address 001D60720A5F has been denied by the DHCP server 192.168.1.1
(The DHCP Server sent a DHCPNACK message).

I'm not sure why the router would suddenly start sending these. Any
suggestions on how to diagnose or proceed would be appreciated.
Click to expand...

What say the event viewer ?
 
Is the connection between computer and router wired, wireless or USB?


--



Hope this helps.

Gerry
~~~~
FCA
Stourport, England
Enquire, plan and execute
~~~~~~~~~~~~~~~~~~~
 
teamgig said:
Greetings,

A couple of days ago, I started experiencing intermittent internet
connectivity on all of the computers in my home. Symptoms include
having to try multiple times to get to a web page, or periods of
several minutes with no connectivity at all, and drops of the VPN into
my work network.

I have power-cycled all of the equipment -- cable modem, routers,
computers -- several times. The ISP reports no issues or problems on
their end. In Event Viewer on all the PC's, there are many DHCPNACK
errors of the type shown below. On one computer, for example, I have
67 of these in the last 24 hours. These started occuring right when
the symptoms began (6:15 AM on Saturday), and the previous such event
was logged more than three months prior.

The IP address lease 192.168.1.102 for the Network Card with network
address 001D60720A5F has been denied by the DHCP server 192.168.1.1
(The DHCP Server sent a DHCPNACK message).

I'm not sure why the router would suddenly start sending these. Any
suggestions on how to diagnose or proceed would be appreciated.
Click to expand...

Did you update the Router firmware recently?.

Log into the router UI (user interface) ad make sure the router/DHCP
configured to issue an Automatic IP addresses to all machine connected to it
and see if you configured the DHCP to issue a renewal of IP to machine after
such a period of time.
From the error the router/DHCP issuing a release command and for some reason
it is logging the error/warning in the log as the machines didn't respond in
timely fashion.

Does your VPN/DHCP server force you to renew the IP address after a certain
time?.

Flushdns on all machine then issue the command renew or release and reboot
all machines and monitor their progress.
BTW do you use a small ms business server or any server of that matter!.
Also best if you post your question here:
http://www.microsoft.com/communitie...dd8-fd79-4301-9813-2a2497c20996&lang=en&cr=US

HTH.
nass
 
What say the event viewer ?
Click to expand...

Well, each error simply has the message I entered above [ "The IP
address lease 192.168.1.102 for the Network Card with network address
001D60720A5F has been denied by the DHCP server 192.168.1.1 (The DHCP
Server sent a DHCPNACK message)" ]

I get these as frequently as once per minute, or sometimes as
infrequently as one per hour. I see them in the Event Viewers of all
the PC's connected. It's been that way since 4/12 at 6:15 AM. Prior
to that, I didn't have any symptoms, and Event Viewer doesn't show any
of these errors for the past three months. So obviously something has
gone wrong. Not sure if the router has simply failed, or if there is
some other possible explanation.
 
Did you update the Router firmware recently?.

Log into the router UI (user interface) ad make sure the router/DHCP
configured to issue an Automatic IP addresses to all machine connected to it
and see if you configured the DHCP to issue a renewal of IP to machine after
such a period of time.
From the error the router/DHCP issuing a release command and for some reason
it is logging the error/warning in the log as the machines didn't respond in
timely fashion.

Does your VPN/DHCP server force you to renew the IP address after a certain
time?.

Flushdns on all machine then issue the command renew or release and reboot
all machines and monitor their progress.
BTW do you use a small ms business server or any server of that matter!.
Also best if you post your question here:http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg...

HTH.
nass
---http://www.nasstec.co.uk
Click to expand...

The router firmware is on the latest revision, but I went to that six
months ago. Everything has been running fine until 2 days ago. No
server in the network. The client refresh time in the router is set to
0, which means one day.
 
I have power-cycled all of the equipment -- cable modem, routers,
computers -- several times.
Click to expand...

Routers ? How many routers do you have and how are they connected?
How many of them have DHCP enabled?

-- John
 
Routers ? How many routers do you have and how are they connected?
How many of them have DHCP enabled?

-- John
Click to expand...

Two routers, cascaded together per Linksys' instructions, different IP
addresses for each. Only one has DHCP enabled.

This setup has been working fine for months, but in order to verify
that the second router wasn't causing any problems, I disconnected the
cascaded yesterday. For more than 24 hours I have been running with
only one router and nothing cascaded. No change in symptoms on the
PC's. Seems like my main router is failing. It just seems odd to me
that it would fail intermittently like this and not just go down
completely.
 
m:
Two routers, cascaded together per Linksys' instructions,
different IP addresses for each. Only one has DHCP enabled.

This setup has been working fine for months, but in order to
verify that the second router wasn't causing any problems, I
disconnected the cascaded yesterday. For more than 24 hours I
have been running with only one router and nothing cascaded. No
change in symptoms on the PC's. Seems like my main router is
failing. It just seems odd to me that it would fail
intermittently like this and not just go down completely.
Click to expand...

Yes, it sounds like your main router is failing. Try putting the
biggest number you can in the "Lease Time" configuration of your. This
will allow you to work for a longer period of time before it fails.

You might also try to re-flash the router's firmware (even if you have
the latest). This might fix the programming and allow it to work
again.

HTH,
John
 
m:






Yes, it sounds like your main router is failing. Try putting the
biggest number you can in the "Lease Time" configuration of your. This
will allow you to work for a longer period of time before it fails.

You might also try to re-flash the router's firmware (even if you have
the latest). This might fix the programming and allow it to work
again.

HTH,
John
Click to expand...

More data: I pulled the main router out of the config entirely, and
swapped in the other router (which had previously been cascaded; I
reconfigured it to enable DHCP). With that setup, I have been running
with no errors at all for several hours now. So, it appears that my
main router (newer, ironically) is indeed failing. Thanks for the
idea of re-flashing the failing router. I'll give that a try before I
simply replace it.
 
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