[tor-relays] DoS attack on Tor exit relay

[gerard at bulger.co.uk]

Thanks.  I just could not see how Fail2ban would work on an ORport.  What log would it look at?  What criteria for the jail?   The fai2ban on my non-tor VPS does not yet work with IPv6,  which is partly the nature of IPV6 rather than a programming issue.  I did not realise IPV6 was ignored until a weak email account was found.  So I firewalled off most IPv6 ports instead.

-----Original Message-----
From: tor-relays <tor-relays-bounces at lists.torproject.org> On Behalf Of potlatch
Sent: 05 August 2019 00:04
To: tor-relays at lists.torproject.org
Subject: Re: [tor-relays] DoS attack on Tor exit relay

Gerry,
At this point I have no working scripts for Tor/fail2ban.  Be happy to share if they ever materialize.  Fail2ban is sorely lacking documentation--or at least I can't find detailed docs.  I downloaded fail2ban on current debian and ubuntu VPS and got different version numbers--none were the current release.  Stay tuned or give a hand.
-potlatch


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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, August 1, 2019 4:16 AM, <gerard at bulger.co.uk> wrote:

> Can we have your fail2ban scripts for the OR port? The jail and rules?
>
> Gerry
>
> -----Original Message-----
> From: tor-relays tor-relays-bounces at lists.torproject.org On Behalf Of teor
> Sent: 01 August 2019 00:28
> To: tor-relays at lists.torproject.org
> Subject: Re: [tor-relays] DoS attack on Tor exit relay
>
> Hi,
>
> > On 1 Aug 2019, at 02:27, Larry Brandt lbrandt at cni.net wrote:
> > Yes, I have fail2ban installed but the attack is focused on my ORPort
>
> 9001.  Similarly, I have an external firewall but it permits 9001 port
>     passage.
>
>     If you're trying to prevent too many connections, you can adjust the DoS
>     torrc options:
>     DoSConnectionEnabled 1
>     DoSConnectionMaxConcurrentCount 1
>     DoSConnectionDefenseType 2
>
>     If that works, try adjusting DoSConnectionMaxConcurrentCount a bit
>     higher: 10 or 25 are good values.
>
>     T
>
>     --
>     teor
>
>
> tor-relays mailing list
> tor-relays at lists.torproject.org
> https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays


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