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Unfortunately the performance of DansGuardian/Squid when first .. for rebuilding DansGuardian, see question Usage#11c in the Wiki FAQ. DansGuardian is an award winning Open Source web content filter which currently runs on Linux, FreeBSD, OpenBSD, NetBSD, Mac OS X. DansGuardian is an award winning Open Source web content filter which DansGuardian is excellent at filtering pages from the Internet as it . Content is available under GNU Free Documentation License or later.

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If you have a mixed environment and so can’t use NTLM authentication, use Ident authentication instead. More importantly, they suggest that the whole regular expression is of poor quality, so you should closely examine the whole thing. With only local blacklists —but no OpenDNS— you’re relying very heavily on DansGuardian’s content filter mechanism to forbid the use of proxies. The remaining steps on this page will simplify all that for you.

The choice of which way s to minimize authentication is highly dependent on the particulars of the environment, so no general recommendation can be made.

In Squid, identification of particular hosts should usually be done with dstdomain. Modify the source code and rebuild the dansguardain program. This is not a solution however; the alternative of completely skipping authentication of users from some source computers has several drawbacks, including:. Not Until It Works. And even better than that is if the Squid cache partition is the only thing on a disk which is not otherwise used at all. For our children’s computers, we must also prevent access to materials that are “harmful to minors”.

Even after skipping is prevented, an end user may still be able to connect right dansguardia DansGuardian to an external proxy site and hop onward to a restricted site, or to avoid web ports completely with some dansguarrian tools.


Use comments to note the date and reason for each exception, supporting periodic cleanups of the cruft. Using more than one blacklist simultaneously can provide several benefits: One of its side effects will be to prevent documentattion around, so there still won’t be any problem.

Please expand these instructions with details for a dicumentation that build on the IPtables configuration built into their distribution and b those that craft individual IPtables commands. The details of why the page was blocked can be brief or detailed depending on the settings. DansGuardian Documentation Wiki You are here: No corresponding category in shalla.

Rather, the algorithms figure that if a certain threshold of dirty words is reached on a page, odds are there are also pornographic visual materials on the page and the page is therefore blocked. Note though some have questioned the thoroughness and timeliness of OpenDNS updates, suggesting using OpenDNS exclusively while also neglecting constant improvement of content scannng recipes may leave a system vulnerable to circumvention by public proxies.

The parameter maxchildren should generally be about the same as your peak number of simultaneous users. In most cases using a regular expression to identify a particular host not only isn’t necessary but also can significantly degrade performance. And, as always, save and close your file.

Ubuntu Hardy and DansGuardian, Page 6 – Configuring DansGuardian

If this happens dansgardian may need to reconfigure your kernel or even rebuild it. If possible attend to them all. You can make it very easy for any administrator to find the appropriate configuration file by making these tags for blacklist files simply list the parent directory name pets, phishing, porn, proxy, etc.

This problem may also affect several of the recommended solutions below. You’ll notice that none of these factors actually deals with images per se.


The main limit on the complexity of a multiple filter groups configuration is your imagination; in fact it’s pretty easy danzguardian unintentionally create a spaghetti mess. License and Copyright – link to DansGuardian site. A few important yet highly non-technical users for documentayion a CEO. Kernel In a few cases with extremely large systems typically over a thousand simultaneous usersyou will hit a kernel limit with either the number of file descriptors or the size of a directory.

The override bypass ddocumentation is shown if the user is authenticated, the reporting level is set to report details and the bypass link is enabled in the filtergroup.

Dansguardian Internet Content Filtering

We’ll go through the essential DansGuardian configuration files one by one now, but I encourage you to look at all of them when you can. Here’s an example with a value filled in for the group name. Grey lists only stop the URL filtering and allow the normal filtering to work.

So long as the helper says it’s okay, Squid will accept it, and DansGuardian will accept it too. On the other hand it’s significantly less secure than NTLM and should only be used with caution if you’re worried about internal crackers. Please contribute if you’d like more formats supported.

You can then save and close the file. The second reason is that each child process will be responsible for handling so many different users that users will begin to interfere with each other.