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How do you allow a private IP address to pass through a firewall?

I linked two pc computers using XP Pro together with private IP addresses along a RJ-45 connection using no hub with a cross-over cable. I do get a connection and I've also set up the same the workgroup for each computer. The network works when Norton security and windows firewall is turned off, but not when they're turned on. Is there any way to allow the private address to pass without turning off the firewall protection?
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barnesco
Asked:
barnesco
1 Solution
 
Yan_westCommented:
can the computers ping each other??
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Yan_westCommented:
while the firewall is on I mean :)
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barnescoAuthor Commented:
They can only when the Norton Security is disabled, otherwise, they can't.
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Yan_westCommented:
I have always deeply detested norton firewall products.. what happens if you disable it completly and activate only the windows firewall adding up "file and print" sharing as an exeption for your internal network?
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barnescoAuthor Commented:
I'll try it when I get home for lunch, otherwise, I agree--Norton's a pain. Neverthess, I'm nervous about allowing just the windows firewall to protect the network. Kind of like letting the cat protect the mice. Hackers could exploit another windows vunerability. Are you thinking this should be one of the final solutions or a step along the way. Thanks for your help.
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Yan_westCommented:
Hmm, well.. doing this would be ok i guess for a single computer on the internet..

If I would be you, I would buy a Cheap Linksys broadband router/firewall.. (the one that does statefull packet inspection) and put all your computer behind this.. it would cost you about 40$/50$ USD max..

I think the only good thing that comes from norton for home products are their Anti-virus, and then again, they cause some problem. Yesterday, One of my clients stop being able to receive and send email properly.. Just because their provider upgraded their POP/Smtp servers to force users using SSL to get and send emails. Norton does not even support that, so I had to disable Email virus scanning, Norton Spam Protection, and confidentiality shield from norton Security. Symantec even tells people that they do not support this feature.

The least additional stuff you can put on your computer, the better.
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Yan_westCommented:
This is the router i was telling you about:

http://www.linksys.com/products/product.asp?grid=34&scid=29&prid=561
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srikrishnakCommented:
There is always good n bad with any thing on this planet..Depends on our needs we use it and reduce the scope of Pros or Cons..;)
If you are trying to access Norton Firewall then probably you can allow your firewall to accept the connection from your other host..Windows Firewall is relatively easy, you just needed to enable the firewall for File and Print sharing...
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BembiCEOCommented:
No read everything, but if you connect two computers together and a internet firewall is activated on one or both of the machines, this firewall will usually filter NETBIOS requests. These requests are necessary for a lot of services, esp. browser service, windows logon, file and print sharing etc. For these services, you must open the ports
 
netbios-ns      137/udp    NETBIOS Name Service    
netbios-dgm   138/udp    NETBIOS Datagram Service
netbios-ssn     139/udp    NETBIOS Session Service

and maybe port 135 for remote procedure call.

These ports are usually closed by default as they are a security risk to leave them open over the internet.

An alternative is either to use VPN, or search for an option to exclude an address rage from the firewall, which may be also by default within the IP rages:
10.x.x.x
172.16.x.x - 172.32.x.x
192.168.x.x

A firewall usually uses a LAT (local address table) to exclude addresses from the firewall, and mostly theses IP addresses are included by default as they are private addresses and not routet over the internet.
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