IC lost after changing to a 100Meg Network ~ Switcher problem?

[JVC Dude]

~I have a shared internet connection, coming in by Wifi to a W-NIC on 1 PC
(setup as 192.168.0.99) served by a broadband router (192.168.0.1).

A second card (192.168.1.1) in the machine connects to my other networked
machines ~(all basic XP) all with addresses 192.168.1.x. I am usng a proxy
server program to feed the internet to all machines.. The original
network card was a10Meg connected to a 10 Meg switcher running the network.
All ran ok using the WIFI link as a gateway.
I changed the switcher to 100Meg. All seemed ok...
I fitted an SIS 900 100Meg NIC , to speed up my network.

The internet is now no longer available to any machine. Network traffic can
be seen 'searching' MY network when it should be searching the WIFI network.

Default gateways etc are all set to look to 192.168.0.1, but the SIS card
seems to make all traffic go through it.
You can ping the router ( & all other machines)
Disabling the card (my network) restores the internet to the main machine.
Same 2 NICs fitted into another XP machine give the same result- so I've
narrowed it down to the switcher/SIS900 card, or possibly some mismatch with
the switcher, but there's nothing I can see to alter..

Could a switcher be trying to act as some sort of gateway?
What am I missing?
cheers AW

 

[Doug Sherman [MVP]]

Some proxy servers use the MAC address or other identifier rather than the
IP address to determine the interface on which they will respond. Since you
have changed this interface, try reconfiguring or reinstalling the proxy
server.

Also: "Default gateways etc are all set to look to 192.168.0.1"

The only default gateway which should be set to 192.168.0.1 is the one for
the 192.168.0.99 NIC. The 192.168.1.1 NIC should have no default gateway;
and the other machines should all have 192.168.1.1 as a default gateway.

Doug Sherman
MCSE, MCSA, MCP+I, MVP

 

[JVC Dude]

Thanks for the reply..
I'll check/remove the 1.1's default gateway setting....
As for the proxy server... I was originally using Wingate... and have
uninstalled/re installed it a couple of times... and out of desperation
tried CCproxy as an alternative with the same effect.

Interestingly, with no proxy server set up the problem is still there when
the card is enabled... I think I may have to try another card...

Thanks Andrew

 

[Doug Sherman [MVP]]

If you are not going to use a proxy server, then routing must be enabled on
the 2 NIC machine. And you must configure a static route on the broadband
router:

route add 192.168.1.0 mask 255.255.255.0 192.168.0.99

You will have to consult your manual in order to determine how to do this on
your router. You want a route to the 192.168.1.x network which points to
192.168.0.99.

Doug Sherman
MCSE, MCSA, MCP+I, MVP

 

[JVC Dude]

Thanks to your suggestion.... of removing the extra default gateway....IT
WORKS !
I'm ok with using the proxy server.. indeed it is a little difficult to
access the router since it's not mine.... we share the broadband connection
from the computer shop across the road..... although I do have the logon
details and can try to setup a route... Thanks for that also...I wasn't
aware that I could get my network to the router like that.
Isn't it 'safer' for my network being behind the proxy server (or Wingate
with its basic firewall) than directly connected to 'their' network?
Cheers
Andrew

 

[Doug Sherman [MVP]]

My last post describes the procedure you would typically use if you owned
and operated the router. That router probably has a firewall built into it,
and typically you would simply connect all your computers directly or
through a switch to the router. However, under the circiumstances you
describe where you do not own or manage the router, your proxy server
solution is a pretty good idea. I don't know that the proxy server provides
you more protection - it might, because proxy servers often provide more
security features than low end routers. More importantly, you get to manage
and control it.

Doug Sherman
MCSE, MCSA, MCP+I, MVP