SQUID ON CENTOS

How to install and configure squid on Centos?
How to install and configure squid on Fedora?

1. Open terminal to install squid
Ctrl + Alt + T

2. install as root
yum install squid

3. Edit squid.conf
nano /etc/squid/squid.conf

#

# Recommended minimum configuration:

#

acl manager proto cache_object

acl localhost src 127.0.0.1/32 ::1

acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1

# Example rule allowing access from your local networks.

# Adapt to list your (internal) IP networks from where browsing

# should be allowed

acl localnet src 10.0.0.0/8 # RFC1918 possible internal network

acl localnet src 172.16.0.0/12  # RFC1918 possible internal network

acl localnet src 192.168.0.0/16 # RFC1918 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

acl CONNECT method CONNECT

##

# Recommended minimum Access Permission configuration:

##

# Only allow cachemgr access from localhost

http_access allow manager localhost

http_access deny manager

# Deny requests to certain unsafe ports

http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports

#http_access deny CONNECT !SSL_ports

# We strongly recommend the following be uncommented to protect innocent

# web applications running on the proxy server who think the only

# one who can access services on "localhost" is a local user

#http_access deny to_localhost

#################################################

#INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS

##

#################################################

#Time Based ACL

##

#acl officehours time MTWHFA 9:15-13:30

#acl officehours time MTWHFA 14:00-17:00

#acl blsites url_regex -i "/etc/squid/officetime.acl"

#http_access deny blsites officehours

#################################################

#disable caching

##

#acl nocache src all

#no_cache deny nocache

# Example rule allowing access from your local networks.

# Adapt localnet in the ACL section to list your (internal) IP networks

# from where browsing should be allowed

http_access allow localnet

http_access allow localhost

# And finally deny all other access to this proxy

http_access deny all

# Squid normally listens to port 3128

http_port 192.168.100.1:3128 transparent

#ssl-bump cert=/etc/squid/myCA.pem

#acl broken_sites dstdomain .facebook.com

#ssl_bump deny broken_sites

#always_direct allow all

#ssl_bump allow all

# the following two options are unsafe and not always necessary:

#sslproxy_cert_error allow all

#sslproxy_flags DONT_VERIFY_PEER

# We recommend you to use at least the following line.

hierarchy_stoplist cgi-bin ?

## Uncomment and adjust the following to add a disk cache directory.

#lru    : Squid's original list based LRU policy

#heap GDSF : Greedy-Dual Size Frequency

#heap LFUDA: Least Frequently Used with Dynamic Aging

#heap LRU  : LRU policy implemented using a heap

##

#cache_mem 18432 MB

#cache_dir diskd /cache/squid 18432 16 256

#cache_replacement_policy heap LFUDA

#memory_replacement_policy heap LFUDA

# Leave coredumps in the first cache dir

coredump_dir /cache/squid

#Log

access_log /var/log/squid/access.log

# Add any of your own refresh_pattern entries above these.

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

4. Enable ipv4 forwarding

echo 1 >/proc/sys/net/ipv4/ip_forward

5. IPTABLES RULES TO ROUTE PORT 80 TRAFFIC TO 3128 AND SEND OUTWARD

iptables -t nat -A PREROUTING -i eth2 -p tcp --syn --dport 80 -j REDIRECT --to-port 3128

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

6. Save iptables

service iptables save

7. Client side default gateway settings

Go to LAN settings at client side and set default gateway to proxy's ip 192.168.100.1