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How to protect an IRC network from spam

Dealing with spam is something every IRC network had to do in the past, present or even maybe in the future.

If it is somebody that is trying to give your network a bad name, a trojan horse that tries to infect your users or just someone that tries to annoy you and your users doesn’t quite matter, spam probably has been an issue as long as IRC has existed.

Luckily, there are quite a few methods and ways to counter-act on it.

First thing should be educating your users to not click on anything that has been sent to them unsolicited – or performing any commands that promise them to “get free ops” and what else is going to be tempting to some – or they also might unwillingly and unknowingly join the spammers.

There are many (semi-) automated means to combat spam, mostly depending on what software you use – or are willing to use – on your network.

Some IRCd’s, such as Unreal or InspIRCd, already have built-in functionality to filter spam in any part that is visible to other IRCers – those however require that someone notices the spam and adds a regular expression to block and act upon it.

Completely automated ways to combat drones and malicious users include setting up a proxy scanner using DNS blacklists, or DNSBLs for short. There are extensive lists of various blacklists available on the internet but only some of them are meant to be used exclusively for IRC so choose wisely.

But what if the IRCd of your choice doesn’t support spamfilters and you don’t want to use DNS-based blacklists? IRCDefender is a software that could provide you with such functionality by adding a “pseudo-server” to your network which sole purpose would be checking for spam and everything else you configure it to do.

Neostats is another service that can help you combat malicious activity – it might even already be installed so you only would need to add the SecureServ module to it to have an additional layer of protection available.

So, since preventing spam also somewhat pertains to security, the same rules apply to it: you rather have a few layers to prevent something bad from happening than depend on a single line of defense.

Please share your tips what you do about spam on your network as well as stuff i might have missed :)

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