[WEB4LIB] Private IP and firewall

[Jeff]

On Tue, 23 Feb 1999, Yi Kong wrote:

> Hi, All, Our libraries have a problem to access vender's database from
> Internet by PC's with private IP addresses.  We can access the
> database from our main library, where PC's are using regular IP.  
> Although we ask this vender put those private IP on their list, access
> was still denied.  Technician there thinks it is our firewall's
> interpretation problems.
> 
> Anyone on the list has experience?

Your database vendor will more than likely never see your private ip
addresses, they will only see the IP address of your proxy or NAT or masq
box (sometimes this is the same as your "firewall"). 

If you are having problems determining the real-world IP address that your
clients appear to be originating from, drop me an email and I can give you
a quick URL to test matters.

On second thought... allow me a moment to perl...

Alrighty, the URL you can visit from one of your internal machines to
determine the ip address that the outside world sees the machine as is:

http://tcnet.org/~jeff/proxy.html

Let me know if you have any difficulty/success. 

> 
> Thank you in advance

Your welcome,

-jeff

Jeff Godin
Network Specialist
Traverse Area District Library
jeff at tcnet.org - 616/932-8546 voice