ICS-shared Connection dies when second PC obtains an IP from DHCP

B

BhaaL

Evening!

I've been experiencing problems with ICS and my connection for quite some
time, but up until now, I was suspecting a certain 3rd party application to
be at fault. Due to various reasons, I had to reinstall the 2nd Windows XP
machine that uses my shared connection, and yet the problem persists.

Setup:

My PC is running Windows XP with SP 2, sharing its DSL Connection with my
local network. I will refer to this one as PC#1 for the rest of this posting.
This local network is bridged together from 3 different NICs; one running
over to the 2nd Windows machine, the other from-time-to-time to connect my
Mac using cross-over cable, and one for a Virtual Machine running linux.

DSL (shared using ICS, remote administration is disabled)
|
[shared for]
|
Network Bridge (has DHCP enabled due to ICS, 192.168.0.1)
|
+ Real 100MBit NIC to PC#2
+ Real 100MBit NIC with Crossover, occasionally used by Mac
+ Virtual 100MBit NIC to Virtual Machine

PC#2 is also running Windows XP with SP 2, and just yet a clean installation
with only Antivirus, Firefox and Winamp installed as of now.

I've observed the following pattern so far:
1) PC#1 is up and running, DSL is connected, PC#2 is off.
2) PC#2 is switched on, and after boot it tries to obtain an IP using DHCP.
3) PC#1 gets disconnected, the DSL Modem flashes a few times due to
reinitialization.
4) PC#1 reconnects again, DSL is up again, PC#2 can also access the
internet. No further problems from here on.

Looking at the Event Log, PC#1 shows RemoteAccess informational Event 20159,
as if I disconnected clean and by hand (for 3).
PC#2 shows Tcpip informational Event 4201 (the NIC was connected to the
network successfully and has obtained an IP using DHCP) a few seconds before
PC#1 loses the connection (for 2).
Other than that, no warnings or errors are recorded.

Using the virtual machine (running Debian Linux 3.1 Sarge) or my Mac
(running MacOSX 10.5.1 Leopard), this does not happen; those systems obtain
their IPs using DHCP, and work right away.

I think this problem is related to the configuation of PC#2, but I can only
take a guess for that.
Does anyone know of this problem, or even knows how to resolve it? It's
pretty annoying losing the current connection just because the 2nd PC was
switched on, especially when a Software Update or similar is in progress.

Thanks in advance.
Greetings, BhaaL
 
J

James Egan

I think this problem is related to the configuation of PC#2, but I can only
take a guess for that.
Does anyone know of this problem, or even knows how to resolve it? It's
pretty annoying losing the current connection just because the 2nd PC was
switched on, especially when a Software Update or similar is in progress.

I have two adsl connections available on my small network.

A few months ago I had a similar problem where switching on one of the
pc's caused both adsl routers to re-sync and neither router was
located near to the offending pc. I also noticed a little "noise" on
the flat screen until it's AC adaptor/transformer warmed up which
aroused my suspicion. Then the routers re-synched and everything
worked okay again.

In my case I got this replacement part on eBay
http://cgi.ebay.com/REAL-Acer-19V-3...9294590QQcmdZViewItem?IMSfp=TL080724111r32259
and all was well again.

I was surprised that such a part could take down the whole network.



Jim.
 

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