Hello squiddies. 

I've configured squid/2.6.STABLE21, primary to disallow Internet access when my 
users haven't done their timesheets. Since each machine is named after the user 
it was pretty easy for me to get the list of machines from DHCP, export and 
import into squid.conf - eg - 

acl     username        srcdomain       username.internal.domain.com

then

http_access     allow   username

I comment out the users http_access entry when they haven't done their 
timesheet, put it back in again when complete. I've got 150 acls each with 
srcdomain entries. Due to the hit I'm assuming I'd get with rDNS I've 
configured BIND on the server. 

My problem is that occasionally I'm seeing IP addresses popping up in my 
access.log file and that user is denied - however when I do an nslookup on that 
IP address I get the correct name back. 

The median DNS lookup time is 

DNS Lookups - 0.01535  0.03223 

Which I guess is fast. 

Does anyone have an idea on what my issue is? Too much srcdomain stuff going 
on? If so, can anyone think of a more efficient way to block users (without 
having to reserve all users in DHCP and block by IP address)?

Thanks loads in advance,
Mark

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