Network proxy with Squid

This applies to squid3 on ubuntu

Install ==

 sudo apt-get install squid3

Configuration

 - uncomment "localnet" entries
   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
 - uncomment http_access allow localnet

SNMP

 acl snmppublic snmp_community public
 snmp_port 3401
 snmp_access allow snmppublic localhost
 snmp_access deny all

 snmpwalk -m /usr/share/squid3/mib.txt -v1 -c fotologro localhost:3401 .1.3.6.1.4.1.3495

If you want to access it from port 161 where you are running net-snmp:

 com2sec readonly  default         public
 proxy -v1 -c public 127.0.0.1:3401 .1.3.6.1.4.1.3495

Reporting

Cacti

http://cacti.net

Troubleshooting

Client

 squidclient 'http://www.nytimes.com'|less

Look for "cache" and "miss". Dynamic websites usually tell browsers not to cache their content and squid respects this (?). Forcing squid to cache those objects might cause problems on the clients, unless the remote server has ways around that built-in.

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