• a full-featured Web proxy cache
• designed to run on Unix systems
• free, open-source software
• the result of many contributions by unpaid (and paid) volunteers

• proxying and caching of HTTP, FTP, and other URL's
• proxying for SSL
• cache hierarchies
• ICP, HTCP, CARP, Cache Digests
• transparent caching
• WCCP (Squid v2.3 and above)
• extensive access controls
• HTTP server acceleration
• SNMP
• caching of DNS lookups

• cache_peer
• Each cache should be listed as a sibling

cache_peer 10.10.123.456 sibling 3128 3120 proxy-only
cache_peer 10.10.432.890 sibling 3128 3120 proxy-only

• miss_access
• You might want to deny other nodes from fetching MISSes through your cache

acl localclients src 192.168.0.0/16
miss_access allow localclients
miss_access deny !localclients

• The configuration options suggested above may or may not be legal depending on the contract held between yourself and your Internet Service Provider. It is up to you to check to make sure you are legally able to do this before allowing cache access to anyone.