Spammer to my guestbook

[haveacigar]

Someone has decided to start spamming my guestbook on my website. I tried to implement a ip as a detterent (and i could ban his ip), but they have somehow managed to bypass it. any tips on how to get rid of him?

http://www.alanmonger.co.uk/guestbook.php

[Spookster]

Well blocking the IP or range of IP's is worthless as they can either use a proxy or they might have dynamic IPs. Without requiring a login which defeats the purpose of a guestbook it makes stopping them difficult.

Are there any patterns or similarities in the spam they are posting? If so you could set up a filter of some sort to try and detect the spam posts and ignore them.

[haveacigar]

Well blocking the IP or range of IP's is worthless as they can either use a proxy or they might have dynamic IPs. Without requiring a login which defeats the purpose of a guestbook it makes stopping them difficult.

Are there any patterns or similarities in the spam they are posting? If so you could set up a filter of some sort to try and detect the spam posts and ignore them.

yeah, they seem to link up to pages like blogger, that are filled with adsence advertisments.

I was thinking of putting in a checkbot that says "are you sure you want to post?" and then making it invisible so that if the bot reads it it will check the box and the script wont continue... would that work?

[Spookster]

Yes adding in extra steps could prevent spam assuming it is a bot. If it's a person manually doing this then it won't help. You could also integrate CAPTCHA into the posting process

In case you don't know what it is
http://en.wikipedia.org/wiki/Captcha