Perfect - that's great, thank you!
SNMP should be enabled unless they disabled it. The "squid -v" output
can confirm if there is anything customised in your squid. At the very
least if Squid allowed you to configure a snmp_port then its available.
The absence of mib.txt is a bit annoying, but it just means you will
have to work with raw numbers. Everything should still work normally
without it.
You can download a copy of the 3.1 MIB.txt at
http://bazaar.launchpad.net/~squid/squid/3.1/view/head:/src/mib.txt
The Squid OID numbers are all listed in a human readable format at
http://wiki.squid-cache.org/Features/Snmp#Squid_OIDs for reference
along with the details of how to work snmpwalk with Squid (there are
some tricky gotchas walking the IP address indexed tables).
Amos
