IP address and LAN problems

[Tallan]

I have an ISP and hardwired LAN to a singlt computer, This has worked for
years until the broadband network failed for a week over Xmas. When the ISP
got it back on-line, I could not get a connection. Eventually they advised
using the netsh int ip reset c:\resetlog.txt command. Whilst this fixes the
problem with the network access, it destroys the LAN connection. When I
re-build the LAN connection, I lose the network connection (error 720) if I
restart the host computer. The command gets it back again, but I lose the
LAN and therefore have to start again. I have tried reseting Winsock, but
this makes no difference. I have tried using another host computer, and that
one works OK, even though the network properties are the same on both. One
thing I have noticed is that the IP address assigned by the ISP does not have
the 192.168.0.xxx format on the computer which does not network properly, but
does on the one with no problem. Can someone please suggest a fix. Thanks

 

[Lem]

I have an ISP and hardwired LAN to a singlt computer, This has worked for
years until the broadband network failed for a week over Xmas. When the ISP
got it back on-line, I could not get a connection. Eventually they advised
using the netsh int ip reset c:\resetlog.txt command. Whilst this fixes the
problem with the network access, it destroys the LAN connection. When I
re-build the LAN connection, I lose the network connection (error 720) if I
restart the host computer. The command gets it back again, but I lose the
LAN and therefore have to start again. I have tried reseting Winsock, but
this makes no difference. I have tried using another host computer, and that
one works OK, even though the network properties are the same on both. One
thing I have noticed is that the IP address assigned by the ISP does not have
the 192.168.0.xxx format on the computer which does not network properly, but
does on the one with no problem. Can someone please suggest a fix. Thanks

It's difficult to figure out from your post how you have configured your
systems. It sounds as if you are using Windows Internet Connection
Sharing. Is this correct? Also, how exactly is the "host" computer
connected to the Internet? Please supply make and model of the device
that's between the computer and the wall and how it's connected to the
"host" computer.

How do you "rebuild the LAN connection"?

Please explain more clearly what you mean by the following:

I have tried using another host computer, and that
one works OK, even though the network properties are the same on both. One
thing I have noticed is that the IP address assigned by the ISP does not have
the 192.168.0.xxx format on the computer which does not network properly, but
does on the one with no problem.

What network properties are the same? What IP address are you referring
to, and what is its value?

--
Lem -- MS-MVP

To the moon and back with 2K words of RAM and 36K words of ROM.
http://en.wikipedia.org/wiki/Apollo_Guidance_Computer
http://history.nasa.gov/afj/compessay.htm

 

[Jack \(MVP-Networking\).]

Hi
There are two basic way to share Internet connection between few computers.
1. No-Router - One computer is connected directly to a Modem and the other
computer get their connection from it (aka Host computer).
Here how,
http://www.microsoft.com/windowsxp/using/networking/setup/adhoc.mspx
2. With a Router. System looks like this,
http://www.ezlan.net/network/router.jpg
Here how,
http://www.microsoft.com/windowsxp/using/networking/setup/wired.mspx
If you have Router the Router's manual would be more specific about your
own hardware.
Jack (MS, MVP-Networking)

 

[Tallan]

Lem

Thanks for taking the trouble to respond. Forget the IP address issue - now
realise that that is not the problem as I am working on the computer which is
OK and the IP address assigned by the ISP is not of the 192.168.0.xxx format,
and both internet and LAN connections are working fine. This is the problem
- I can't see any difference in the setup of the computer which does work and
the one that doesn't.

Let me give you a more detailed description of the setup. I have a Dell
Dimension with a Sagem modem connected directly to the phoneline. I also
have another computer (an AppleMac at present, but this can vary) connected
via a patch cable to the Dell. My terminology may be wrong, but I am calling
the Dell the host computer, and the AppleMac the client. When I connect to
Tiscali Broadband from the Dell, I always get the Error 720 message. I run
the netsh int ip reset c:\resetlog.txt command and restart the Dell. I am
then able to connect to Tiscali, but the LAN connection is broken. If I
leave the LAN broken and restart the Dell, I am still able to connect to
broadband. However, if I remake the LAN connection using the wizard (or
typing in the 192.168.0.1 IP address in TCP/IP properties and 255.255.255.0
sub-mask) I can only retain the broadband connection so long as I don't
restart the Dell. As soon as I restart, the broadband connection fails and I
have to start the process all over again. As you can imagine, this is quite
frustrating, and Tiscali appear to have no answer.

My alternative at present is to use a Dell Inspiron 1300 in place of the
Dell Dimension - this works perfectly, even though the IP address and TCP/IP
properties are identical to the Dell Dimension, which doesn't work properly.
As I have said, I hav tried resetting Winsock2 on the Dimension, but this
makes no difference and the Winsock properties (as shown on the system file)
seem to be OK. Completely at a lost for what to do. Did think of using
system restore to get back to a point before this problem arose, but none of
the restore points work!

 

[Lem]

Lem

Thanks for taking the trouble to respond. Forget the IP address issue - now
realise that that is not the problem as I am working on the computer which is
OK and the IP address assigned by the ISP is not of the 192.168.0.xxx format,
and both internet and LAN connections are working fine. This is the problem
- I can't see any difference in the setup of the computer which does work and
the one that doesn't.

Let me give you a more detailed description of the setup. I have a Dell
Dimension with a Sagem modem connected directly to the phoneline. I also
have another computer (an AppleMac at present, but this can vary) connected
via a patch cable to the Dell. My terminology may be wrong, but I am calling
the Dell the host computer, and the AppleMac the client. When I connect to
Tiscali Broadband from the Dell, I always get the Error 720 message. I run
the netsh int ip reset c:\resetlog.txt command and restart the Dell. I am
then able to connect to Tiscali, but the LAN connection is broken. If I
leave the LAN broken and restart the Dell, I am still able to connect to
broadband. However, if I remake the LAN connection using the wizard (or
typing in the 192.168.0.1 IP address in TCP/IP properties and 255.255.255.0
sub-mask) I can only retain the broadband connection so long as I don't
restart the Dell. As soon as I restart, the broadband connection fails and I
have to start the process all over again. As you can imagine, this is quite
frustrating, and Tiscali appear to have no answer.

My alternative at present is to use a Dell Inspiron 1300 in place of the
Dell Dimension - this works perfectly, even though the IP address and TCP/IP
properties are identical to the Dell Dimension, which doesn't work properly.
As I have said, I hav tried resetting Winsock2 on the Dimension, but this
makes no difference and the Winsock properties (as shown on the system file)
seem to be OK. Completely at a lost for what to do. Did think of using
system restore to get back to a point before this problem arose, but none of
the restore points work!

You didn't say how your computer(s) connect to your modem, but because
it's a Sagem modem and because you use Tiscali, I suspect that it's a
USB connection. This is unfortunate, because the home routers of which
I'm aware require an Ethernet connection to the modem. Using a router
would be preferable to the arrangement you're forced to use.

You should not have to keep resetting TCP/IP. Just so that things are
clear, after you reset TCP/IP, you can connect to the Internet and if
you reboot you can still connect. Correct? The problem only recurs
after you run the Windows Network Setup Wizard and then reboot, correct?

Have you tried setting up ICS manually per
http://www.microsoft.com/windowsxp/using/networking/expert/crawford_02july01.mspx
Does this

Have you tried completely uninstalling and then reinstalling the drivers
for your modem? You mentioned that you reset winsock; did you follow
this guidance: http://support.microsoft.com/kb/811259

--
Lem -- MS-MVP

To the moon and back with 2K words of RAM and 36K words of ROM.
http://en.wikipedia.org/wiki/Apollo_Guidance_Computer
http://history.nasa.gov/afj/compessay.htm

 

[Tallan]

Lem

Seems my reply got lost in the ether - here's another try!

I used both the netsh winsock reset and netsh winsock reset catalog commands
as suggested in kb811259, but to no avail.

I have set up the internet proerties according to the other weblink you
suggested, deselecting all connections accept TCP/IP and QoS (which I can't
turn off as it is grayed out) - this has also not worked. I'm beginning to
suspect that there is a fundamental system corruption as my restore points
don't work either, even in Safe Mode. Is there a way of reloading the
network settings software without having to reload all XP?

Trevor

 

[Lem]

Lem

Seems my reply got lost in the ether - here's another try!

I used both the netsh winsock reset and netsh winsock reset catalog commands
as suggested in kb811259, but to no avail.

I have set up the internet proerties according to the other weblink you
suggested, deselecting all connections accept TCP/IP and QoS (which I can't
turn off as it is grayed out) - this has also not worked. I'm beginning to
suspect that there is a fundamental system corruption as my restore points
don't work either, even in Safe Mode. Is there a way of reloading the
network settings software without having to reload all XP?

Trevor

To take the last question first, AFAIK, there is no way, other than the
netsh reset operation, to rebuild the TCP/IP stack in Win XP. There are
a bunch of methods to deal with winsock corruption (e.g.,
http://networking.nitecruzr.net/2005/05/problems-with-lsp-winsock-layer-in.html),
but somehow I don't think that's your problem. BTW, however, before you
used netsh winsock reset did you do all the checking for winsock
problems suggested by the KB article?

The only thing that I can suggest, which I did earlier, is for you to
completely uninstall and re-install the driver for your USB modem. If
this doesn't work, you can try starting a new thread with a more
descriptive subject and text, for example

Subject: Setting up ICS breaks Internet connection

"I have a Sagem DSL modem supplied by Tiscali connected to my computer
by USB. I have Win XP [home/pro/service pack level]. I want to use
Internet Connection Sharing to connect another computer. When I run the
Network Setup Wizard to setup ICS, everything works OK until I reboot.
At that point, my Internet connection is gone and I get error 720. The
Internet connection survives a reboot if I don't setup ICS."

"I have run netsh int ip c:\resetlog.txt and netsh winsock reset, but I
still have the original problem."

"In addition, if I use a different computer, which has Win XP
[home/pro/service pack level] to connect to the Sagem modem, I can setup
ICS on that computer and have no problems after rebooting."

Sorry I couldn't solve your problem.

--
Lem -- MS-MVP

To the moon and back with 2K words of RAM and 36K words of ROM.
http://en.wikipedia.org/wiki/Apollo_Guidance_Computer
http://history.nasa.gov/afj/compessay.htm

 

[Tallan]

Lem

Thanks for trying and for the advice. Just one other thing, I did the
Winsock checks after I had reset (Tiscali told me to reset it). For the
most part, I couldn't find anything wrong with it except that I have 17
entries in the Protocol, two RSVPs and 15 MSAFDs; I suspect this is OK though.

Trevor

Lem

Seems my reply got lost in the ether - here's another try!

I used both the netsh winsock reset and netsh winsock reset catalog commands
as suggested in kb811259, but to no avail.

I have set up the internet proerties according to the other weblink you
suggested, deselecting all connections accept TCP/IP and QoS (which I can't
turn off as it is grayed out) - this has also not worked. I'm beginning to
suspect that there is a fundamental system corruption as my restore points
don't work either, even in Safe Mode. Is there a way of reloading the
network settings software without having to reload all XP?

Trevor

To take the last question first, AFAIK, there is no way, other than the
netsh reset operation, to rebuild the TCP/IP stack in Win XP. There are
a bunch of methods to deal with winsock corruption (e.g.,
http://networking.nitecruzr.net/2005/05/problems-with-lsp-winsock-layer-in.html),
but somehow I don't think that's your problem. BTW, however, before you
used netsh winsock reset did you do all the checking for winsock
problems suggested by the KB article?

The only thing that I can suggest, which I did earlier, is for you to
completely uninstall and re-install the driver for your USB modem. If
this doesn't work, you can try starting a new thread with a more
descriptive subject and text, for example

Subject: Setting up ICS breaks Internet connection

"I have a Sagem DSL modem supplied by Tiscali connected to my computer
by USB. I have Win XP [home/pro/service pack level]. I want to use
Internet Connection Sharing to connect another computer. When I run the
Network Setup Wizard to setup ICS, everything works OK until I reboot.
At that point, my Internet connection is gone and I get error 720. The
Internet connection survives a reboot if I don't setup ICS."

"I have run netsh int ip c:\resetlog.txt and netsh winsock reset, but I
still have the original problem."

"In addition, if I use a different computer, which has Win XP
[home/pro/service pack level] to connect to the Sagem modem, I can setup
ICS on that computer and have no problems after rebooting."

Sorry I couldn't solve your problem.

--
Lem -- MS-MVP

To the moon and back with 2K words of RAM and 36K words of ROM.
http://en.wikipedia.org/wiki/Apollo_Guidance_Computer
http://history.nasa.gov/afj/compessay.htm