02-26-2002
In a broab sense, an IP address is like a postal address...
When you send a postcard, you can't just say "Send this to evil_d00d", you have to tell the post office how to find you. Same with the internet - when you (for example) want to look at unix.com, behind the scenes, your web browser will ask a domain name server "what is the address of Unix.com?". The name servers replies "64.23.37.23".
But which is easier for you to remember, "unix.com", or "64.23.37.23"?
Search google for more specific (and technically accurate) information. For example, here is the results of a search on "TCP/IP tutorial":
http://www.google.com/search?hl=en&q=TCP%2FIP+tutorial
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LEARN ABOUT DEBIAN
pactester
pactester(1) pactester(1)
NAME
pactester - Tool to test proxy auto-config (pac) files.
SYNOPSIS
pactester <-p pacfile> <-u url> [-h host] [-c client_ip] [-e]
pactester <-p pacfile> <-f urlslist> [-c client_ip] [-e]
DESCRIPTION
pactester is a tool to test proxy auto-config (pac) files. It returns the proxy config string for the given URL and the pac file. pactester
uses pacparser C library for most of its functionality.
OPTIONS
-p pacfile
PAC file to test. Specify "-" to read from the standard input.
-u url URL to test the PAC file for.
-h host
Host part of the URL. If not specified, it's determined from the URL.
-c client_ip
Client's IP address (as returned by the function myIpAddress() in PAC files). If not specified, it defaults to the IP address of
the machine on which this tool is running.
-e Enable Microsoft PAC extensions (dnsResolveEx, myIpAddressEx, isResolvableEx).
-f urlslist
A file containing the list of URLs to be tested. This is good for testing a PAC file against a set of URLs.
EXAMPLES
To find out the proxy config string for the pac file "wpad.dat" and the URL "http://www.google.com":
$ pactester -p wpad.dat -u http://www.google.com
For a client with IP address 10.0.12.123:
$ pactester -p wpad.dat -c 10.0.12.123 -u http://www.google.com
For a pac file hosted at http://wpad/wpad.dat:
$ curl -s http://wpad/wpad.dat | pactester -p - -u http://google.com
BUGS
If you have come across a bug in pactester, please submit a bug report at http://code.google.com/p/pacparser/issues/list.
AUTHOR
Written by Manu Garg (http://www.manugarg.com).
RESOURCES
Homepage: http://code.google.com/p/pacparser.
pactester(1)