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 Home » Freeware Downloads » Network Monitoring and Hacks » NxFilter Debian Linux   
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NxFilter Debian Linux
NxFilter is a freeware web-filter designed for enterprise environment. It started as a dns-filter. Now it provides web-proxy based filtering as well. NxFilter can do everything you can expect from a dns-filter or a web-filter.

Faster and lighter

Traditionally we made a web-filter based on HTTP proxy server. There are many commercial products based on Squid proxy. But with this approach you might have a serious latency problem on your network. This is because your web traffic needs to go through one point in your network that is your web-filter and it becomes a bottle neck in your network. This latency problem gets bigger when you have bigger number of users. But thereís another approach. Thatís DNS filtering and NxFilter is a dns-filter. Itís basically a forwarding DNS server with filtering ability. Since it uses light weight DNS protocol thereís no need to have your traffic going through anywhere. You get no latency problem with NxFilter.

Boosting up your Internet speed

Some users reported that after they installed NxFilter on their network their Internet speed improved greatly. This is because NxFilter keeps local cache for DNS lookup. Suppose in your network everybody uses Google public DNS server or your ISP DNS server. Their DNS queries need to be sent to these DNS servers on the Internet and your users need to wait for the response back from these servers. But if you have NxFilter in your network it keeps cache for the DNS response from its upstream DNS servers and reduces the network traffic greatly and your users donít need to wait for the response from these DNS servers on the Internet.


Even though itís faster and lighter compared to the traditional web-proxy based filtering, DNS filtering had its own limit in the past. It did not support user authentication. This is natural because DNS protocol doesnít have authentication scheme. It was the biggest obstacle for a dns-filter to be employed in real-world enterprise environment.

However being a dns-filter, NxFilter provides 4 types of authentication methods for user identification.

IP based authentication
Password based authentication
LDAP authentication
Single sign-on with Active Directory

With NxFilter you can differentiate users and apply different filtering policies.

Application control

NxFilter supports application control through its agents, NxLogon and NxClient. With this feature you can block UltraSurf, Tor, uTorrent, Skype, Minecraft and other applications you want to block.

* NxLogon is the Active Directory single sign-on agent of NxFilter and NxClient is the remote user filtering agent for NxFilter.

Web-proxy filtering

There are many benefits only from a dns-filter but we had to give up several things if we want to go with a dns-filter so far. You canít enforce safe-search and you canít have keyword filtering against URL as itís working on DNS level. But now NxFilter provides web-proxy filtering through its agents, NxLogon and NxClient. NxLogon and NxClient themselves are local web-proxy and they can do whatever a web-filter can do. Currently It supports safe-search enforcing and URL keyword filtering, IP host blocking.

One might think providing these web-proxy agents, NxFilter is not a light-weight filtering solution anymore. But it still is. These web-proxy agents are working as local web-proxy only for one user so it doesnít cause any network performance issue.

Easy deployment

When you deploy a web-filter in your network. The most tricky part would be forcing filtering on your users without too much hassle. If you go with a web-proxy based filtering product you need to setup all the browsers pointing your web-filter as their proxy server. To make things easier you can use so called Ďtransparent proxyí setup so that you donít need to setup all the browsers one by one. But with the transparent proxy setup you have a problem for HTTPS filtering as it is breaking the browser restriction for Ďman in the middle attackí. Your browser will not send HTTPS request to your proxy if you try to redirect the traffic transparently. And plus this transparent proxy setup is quite challenging even for a seasoned systems engineer.

If you go with a dns-filter you are free from all these hassles. You just need to setup your DHCP server using NxFilter as the DNS server for its clients. Then your users will use NxFilter as their DNS server and they will be under filtering. Forcing filtering to users is also possible. You can block outgoing 53 port on UDP and TCP except from NxFilter. Now NxFilter becomes the only DNS server your users can use. Itís already transparent and doesnít cause Ďman in the middle attackí problem with HTTPS.

Itís not just for HTTP traffic

If itís a web-proxy based filtering product you only can filter HTTP and HTTPS but with DNS filtering you can filter almost every protocols including HTTP, HTTPS, FTP, P2P as long as they use DNS.

Malware/botnet detection

NxFilter is also capable of detecting malware and botnet based on DNS packet inspection. It is possible because NxFilter is working on DNS level.

2018/07/23, v4.3.1.1
- classifier.DomainQueue.size returns domainList.size.
- HtmlPatternDetector has been disabled.
- JahasUpdate().copyRulesetToSlaveLocalDb() added.
- NxClassifier ruleset updated to 438.
- Jahaslist has been updated to 2319531.

Downloads Views Developer Last Update Version Size Type Rank
1,667 5,542 Jahastech <img src=""border="0"> Aug 08, 2018 - 10:24 23.82MB DEB 5/5, out of 4 Votes.
File Tags
NxFilter  Debian  Linux  

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