proxy - How to avoid 127.0.0.1 on myIpAddress() in .pac files

Question

Any idea how to avoid myIpAddress() always returning 127.0.0.1, instead of actual the host IP address?

Environment is Ubuntu 11.04 with Firefox 4.0.1.

The standard answer on Wikipedia of removing entries from the /etc/hosts file didn't help.

Answer 1

What has finally worked, was to update the entry in /etc/hosts correctly with the IP address.

In Ubuntu, executable files in the /etc/network/if-up.d directory are being executed after the network manager configures a network interface.

This script does update the ip address accordingly:

#!/bin/sh

set -e

if [ "$IFACE" = lo ]; then
    exit 0
fi

myHostName=T410

# Remove current line with hostname at the end of line
sed -i '/'$myHostName'$/ d' /etc/hosts

# Add new entry to hosts file
ipaddr=$(ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}')
echo "$ipaddr $myHostName" >>/etc/hosts