October 19, 2011

WPAD Auto Discovery of Proxy (Squid) not working with DHCP. RHEL/CentOS

Hi Friends,
I have tried to use DHCP server to broadcast the wpad.dat file for my network but it’s not working. My configuration is below….

Server OS CentOS 5.4 (Kernel 2.6.18-164.el5)
Client OS Windows XP (IE 6, Crome & Firefox 4/5 ) and RHEL 5.3 firefox
IPTables = Stopped
SELinux = Disabled

/var/www/html/wpad.dat (or proxy.pac)
function FindProxyForURL(url,host)
return "PROXY";

Apache confige
AddType application/x-ns-proxy-autoconfig .dat
AddType application/x-ns-proxy-autoconfig .pac

DHCP Config
# DHCP Server Configuration file.
# see /usr/share/doc/dhcp*/dhcpd.conf.sample
ddns-update-style interim;
#ignore client-updates;
option wpad code 252 = text;
#option wpad "";
subnet netmask {

# --- default gateway
option routers;
option subnet-mask;

# option nis-domain "domain.com";
option domain-name "mynet.org";
option domain-name-servers;

option time-offset -18000; # Eastern Standard Time
# option ntp-servers;
# option netbios-name-servers;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
# option netbios-node-type 2;

range dynamic-bootp;
default-lease-time 21600;
max-lease-time 43200;

I have tried wpad.dat and proxy.pac both in DHCP config file.
If I am setting the url ( in browser it’s working and using my squid proxy server but when I checked “Automatically detect proxy setting for this network” it’s not supplying the proxy setting to the client. I have tried it with IE, Firefox and Crome but result is same.

Pls help and Thanks in advance….

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