don't worry 40-50 mbps is nothing as long they dont open massive number of connections per second.
as I already write here: gofuckyourself / showthread.php?t=1006103
how much connections/sec they open? what kind of attack?
proably you can handle this scriptkiddy ddos attack with server hardening only... give them a try, google for: inetbase ddos script
If your forum is for small set of countries only, move to a DNS Service with Geo split service.
Install GeoIP on your server and do the same there, you can put this rules inside .htaccess.
Such small attack is not hard to fight server based as long the connections/sec are not too high.
A real hard fighting begins above 20 gbps and above 1 mio new connections per second :-)
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regarding Geo DNS / local GeoIP Routing -> sent all requests that you don't need back to 127.0.0.1
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WTB: Video Dating Profiles ICQ: 8.21 / 000 (digits only)
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