To hard code IP and needed URL 

/etc/hosts
123.134.123.123 mysite.test.com

To modify the DNS server IP

/etc/resolve.conf
nameserver 8.8.8.8
Pay attention, at reboot this maybe overwritten

To setup your static network config

/etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#auto eth0
#iface eth0 inet dhcp

auto eth0
iface eth0 inet static
address 10.32.69.60
netmask 255.255.255.0
gateway 10.32.69.1
dns-nameservers 10.32.3.10

To configure a proxy

/etc/environnement
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
https_proxy="https://10.32.69.50:8888"
HTTPS_PROXY="https://10.32.69.50:8888"
http_proxy="http://10.32.69.50:8888"
HTTP_PROXY="http://10.32.69.50:8888"
Tips: proxy server could be a tiny proxy, quite easy to setup