first measure on a good day how many connection per /24 your exit/relay
have, excluding these with 1 2 or just 3 connections:

# netstat -tupan | grep ESTABLISHED | grep /tor | awk '{print $5}' | awk
-F: '{print $1}' | awk -F. '{print $1"."$2"."$3}' | sort | uniq -c | sort
| egrep -v '      1 |      2 |      3 '

with this information in hand, double the max of it (mine was 10
connections from 188.214.30.0/24):

     10 188.214.30

iptables -A INPUT -i eth0 -p tcp -m connlimit --connlimit-above 20
--connlimit-mask 24 -j REJECT --reject-with tcp-reset

cheers.

x9p

>> connlimit per /24. it does more good than evil.
>
> Any guidance on the specifics? Like how many concurrent connections to
> allow per /24? Not sure what's expected from legitimate user traffic
> through the relay... don't want to make things worse.
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>


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