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

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Le 05/10/2010 à 20:55, Mario a écrit :

After working 4 hours I found that FS was hosed due to someone from
208.109.87.234 sending tons of traffic to FS. I blocked the IP address.
Not only did it overload the connection but stopped FS from working,
meaning no phones. This had not happened with the SPA9000. I listed on
on a FS conference call discussing this issue. Is there someplace that
has a list of things to do to prevent/reduce this? I did have ports,
etc. blocked in the firewall. Thanks. Mario

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