Thanks to all, I will look into and use some or all options presented here. Amazing, this happened so fast, I didn't even have the machine in full use, just in testing on/off since 9/20 and I'm only a SOHO. Still have 2 things to figure out before the switch. Thanks again! On 10/05/2010 03:09 PM, Kristian Kielhofner wrote:
It may have started here:
http://blog.krisk.org/2008/07/sip-dosddos-mitigation.html
If other people have made improvements I'd love to hear about them and maintain the script somewhere :).
On Tue, Oct 5, 2010 at 5:25 PM, David Ponzone <david.ponzone@ipeva.fr> wrote:
Mario, personnally, following a DoS REGISTER attack I had recently, I configured some rate-limiting on REGISTER attempts. Here is the result, in "iptables-save" format: -A INPUT -d YOUR_FS_IP -p udp -m udp --dport YOUR_FS_PORT -m string --string "REGISTER" --algo kmp --from 20 --to 60 -j dos-filter-register-external -A dos-filter-register-external -m hashlimit --hashlimit 5/sec --hashlimit-burst 8 --hashlimit-mode srcip --hashlimit-name REGISTER --hashlimit-htable-size 24593 --hashlimit-htable-expire 90000 -j RETURN -A dos-filter-register-external -j REJECT --reject-with icmp-admin-prohibited This will ratelimit REGISTER packets coming to YOUR_FS_IP:YOUR_FS_PORT to 5 per second for each source IP. PS: thanks to the experienced people on #freeswitch for the help provided to setup this filter. David Ponzone Direction Technique email: david.ponzone@ipeva.fr tel: 01 74 03 18 97 gsm: 06 66 98 76 34 Service Client IPeva tel: 0811 46 26 26 www.ipeva.fr - www.ipeva-studio.com Ce message et toutes les pièces jointes sont confidentiels et établis à l'intention exclusive de ses destinataires. Toute utilisation ou diffusion non autorisée est interdite. Tout message électronique est susceptible d'altération. IPeva décline toute responsabilité au titre de ce message s'il a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire de ce message, merci de le détruire immédiatement et d'avertir l'expéditeur.
-- *Mario*