Squid statistics
 

Using ipchains I'v redirect all my net station's traffic to 3127 port of squid proxy...
How to make squid accounting of that traffic?

The squid log will do some accounting for you. If you need more in depth accounting get squidguard or one of the other (many) attachments for Squid. A lot of logging can be set up in the squid.conf file as well. What kind of accounting are you looking for.

access_log is not filling by new records...

Have you doublechecked logging settings in the squid.conf file? Post the conf file and we'll have a look. Sometimes the settings can be tricky if not configured just so.

look, when i connect to my proxy from other comp, all loging is working, but when redirecting traffic, this is not included into my log... - all except redirected traffic!