Proxy by dhcpd that don't work ?

[Alex Sharaz]

I'm having problems with this as well. Up till Friday I had

option wpad-curl "http://wpad.hull.ac.uk/wpad.dat\n";

Which seemed  to work for 99.9% of IE clients and never worked for
firefox/Mozilla clients.

On Friday I changed the string termination to be \000 to see if we'd
sort out the last .1% of users. Seems to have been a mistake cos our
helpdesk had quite a few calls from users saying that their internet
access had stopped.

Going back to the \n version seems to have fixed things.

In terms of accessing wpad.hull.ac.uk, What i've got is a foundry
networks serveriron hardware load balancer platform with 3 real servers
sitting behind them. Wpad.hull... is set up as a virtual host on the
real servers and the serveriron load balances requests to the 3 real
servers. As a catch all, there is a default web server running on each
of the 3 real servers in case someone tries to get the wpad.dat by
calling http://150.237.47.203/wpad.dat

What i've found is that all the Mozilla/firefox traffic seems to go to
the default server and not the wpad.hull .. virtual host.

There's also a lot of other things out there that seem to go for the
ipaddress/wpad.dat url as well.

In general once you've applied all the service packs to a windoze
machine this "just work" but  we do have some systems that just refuse
point blank to work with auto detect proxy settings.

Alex


-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On
Behalf Of Glenn Satchell
Sent: 05 February 2008 10:22
To: dhcp-users at isc.org
Subject: Re: Proxy by dhcpd that don't work ?

If you load the proxy url in your browser do you get the file?

http://wpad.networka.int/proxy.dat

Some versions of operating systems have a bug where they drop the last
char of the url. So it tries to get http://wpad.networka.int/proxy.da
and gets an error which should be in your web server error logs if it
is a problem.

In a post the other day I showed a null on the end of the wpad-url, eg

option wpad-url "http://wpad.networka.int/proxy.dat\000";

which has worked well for me and gets around the truncation.

Does the proxy.dat file work if you specify that url as a manual proxy 
configuration in the browser config? If there is a syntax error, then
the
browser may refuse to load it.

regards,
-glenn

>Date: Tue, 05 Feb 2008 10:26:12 +0100
>From: Phibee Network Operation Center <noc at phibee.net>
>To: dhcp-users at isc.org
>Subject: Proxy by dhcpd that don't work ?
>
>Hi
>
>i have put:
>
>authoritative;
>ddns-update-style none;
>default-lease-time 3600;
>max-lease-time 86400;
>option wpad-url code 252 = text;
>
>subnet 10.1.1.0 netmask 255.255.255.0 {
>       option domain-name "networka.int";
>       option domain-name-servers 10.1.1.254;
>       option subnet-mask 255.255.255.0;
>       option broadcast-address 10.1.1.255;
>       option routers 10.1.1.254;
>       option ntp-servers 10.1.1.254;
>       option wpad-url "http://wpad.networka.int/proxy.dat";
>
>       pool {
>               range 10.1.1.1 10.1.1.200;
>       }
>}
>
>
>and in proxy.dat:
>
>function FindProxyForURL(url, host)
>{
>   if( shExpMatch(url, "!https:*") || isPlainHostName(host) || \
>       dnsDomainIs(host, ".network1.int") || dnsDomainIs(host, 
>".networka.int") )
>   {
>       return "DIRECT";
>   } else {
>       return "PROXY 10.1.1.254:8080; DIRECT";
>   }
>}
>
>
>and i don't understand, that's don't work  ! the computer get the IP
but
>the proxy don't change and  i don't see into logs a http access to
wpad.neXX
>
>where is my error ?
>
>Thanks bye
>
>
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