In the first place, the above list is simply wrong because the first two (boulder.co.us and vail.co.us) are unnecessary. Any domain name that matches one of the first two will also match the last one (co.us). Ok, but why does this happen?
The problem stems from the data structure used to index domain names in an access control list. Squid uses Splay trees for lists of domain names. As other tree-based data structures, the searching algorithm requires a comparison function that returns -1, 0, or +1 for any pair of keys (domain names). This is similar to the way that strcmp() works. The problem is that it is wrong to say that co.us is greater-than, equal-to, or less-than boulder.co.us. For example, if you said that co.us is LESS than fff.co.us, then the Splay tree searching algorithm might never discover co.us as a match for kkk.co.us. similarly, if you said that co.us is GREATER than fff.co.us, then the Splay tree searching algorithm might never discover co.us as a match for bbb.co.us. The bottom line is that you can’t have one entry that is a subdomain of another. Squid-2.2 will warn you if it detects this condition.
Related Questions
- In the first place, the above list is simply wrong because the first two (boulder.co.us and vail.co.us) are unnecessary. Any domain name that matches one of the first two will also match the last one (co.us). Ok, but why does this happen?
- I uploaded my index.html file, and I can see it in my FTP list, but the web shows the same page that was already there. Whats wrong?
- Can I list my domain name under multiple categories?
