[tor-relays] DoS attacks on multiple relays

[Aneesh Dogra]

Interesting to see. I have similar stats. 10 connections from
188.214.30.0/24, second up 8 connections from 178.16.208.0/24. Thanks!

On Tue, Dec 5, 2017 at 4:27 PM, x9p <tor at x9p.org> wrote:

>
> 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.
> > _______________________________________________
> > tor-relays mailing list
> > tor-relays at lists.torproject.org
> > https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays
> >
>
>
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>



-- 
Regardless, I hope you're well and happy -
Aneesh
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