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How to unblock IP address 192.168.*.*

Posted on 2008-10-30
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Last Modified: 2012-05-05
I have a Windows XP machine with two (2) network cards installed. One of the networks is for company LAN the other is for a local subnet used to control some machinery. Both cards have been set with completely independent static IP addresses. I can ping the machine (192.168.103.1) but I can not access it's setup/control page via Internet Explorer (A communication error occurred: "Connection refused"). If I disconnect the network cable from the company LAN then I can connect to the machine just fine. This tells me that the company LAN firewall ( or whatever) is blocking my access to 192.168.*.* addresses. How can I isolate the two network cards so that communication to the 192.168.*.* addresses does not use the company network card?
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Question by:pwken
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Assisted Solution

by:leebaskin
leebaskin earned 200 total points
ID: 22844566
do you have a gateway address on both NICs?

can you attach a basic network diagram showing what you are tring to do?
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Author Comment

by:pwken
ID: 22844959
No gateway address for either NIC.

However IE is setup to use a proxy server to access the company network. I'm thinking this is directing the address to this proxy and the proxy can not resolve the 192.168.*.* so I get the error message. I'm thinking an easy solution might just be to install Firefox with no proxy settings to access the machines and use IE to access the company network.

Basic network:

PC-1 (two (2) network cards) one card connected to company network, second card connected to 4 port hub) Subnet uses 192.168.10.10 with netmask 255.255.0.0. Company network uses entirely different IP addresses.

PC-2 (one (1) network card) uses 192.168.10.* with netmask 255.255.0.0 connected to HUB.

Machine (192.168.103.1) connected to HUB.
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Expert Comment

by:leebaskin
ID: 22845582
Is your windows firewall turned off?

Your subnet mask is wrong! Change your subnet mask to 255.255.255.0 on both nics!!  
You have the same network on both network adaptors&

can you change the address of the machine side? If you can change it to something like
172.16.x.x
255.255.255.0
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LVL 1

Expert Comment

by:leebaskin
ID: 22845656
what is the address on your company network side?

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Accepted Solution

by:
pwken earned 0 total points
ID: 22846422
Thanks for the help but I have resolved the problem myself. I have decided to disable the proxy. This eliminates the ability for the PC to access any WAN but still access the LAN and provide communication to the machine.
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