I am using Ubuntu 12.04 amd64 and have just installed the Squid 3.1.19 Ubuntu package.

From the Squid Configuring Page, I find that the default config for Squid 3.1 is :

http_port 3128

refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320

acl manager url_regex -i ^cache_object:// +i ^https?://[^/]+/squid-internal-mgr/

acl localhost src ::1
acl to_localhost dst ::1

acl localnet src     # RFC 1918 possible internal network
acl localnet src  # RFC 1918 possible internal network
acl localnet src # RFC 1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http

http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access allow localnet
http_access deny all

My Ubuntu 12.04 server and a WinXP personal computer are sit behind a home router (using the network which connects to the Internet. I have also setup a remote computer to connect to the Ubuntu 12.04 server through VPN using the network

As a newbie in using Squid, I want to know how to make changes to the Squid 3.1 default config file so that the VPN remote computer (i.e. network) could browse the Internet through the Squid http proxy installed in the Ubuntu 12.04 server. Or has the default Squid configuration handled this for me and I do not have to make any change ? Moreover, in the home router, do I need further setup other than redirecting TCP/UDP port 3128 (the default Squid proxy port) traffic to the Ubuntu server through NAT ?

In the VPN remote computer, I am using Firefox. If my Ubuntu server has a network address of in the VPN network, should I just fill in "HTTP proxy"= and "Port"=3128 in the "Manual proxy configuration" section of the firefox preferences?

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