- tor-relays - lists.torproject.org

Tor DDoS Mitigation iptables scripts update. Version 4.0.1
by Chris 30 Nov '22

30 Nov '22

Background: A set of bash scripts used to apply iptables rules to fight the current DDoS attacks. They require no dependencies to install except iptable/nftables which all Linux flavors already have and require no particular expertise. The issue was discussed here: [issue 40093](https://gitlab.torproject.org/tpo/community/support/-/issues/40093) Change log: Some modifications due to a change in the nature of the attacks. - Re ordered rules for more efficiency and reducing the load - Removed the hashlimit rule as it puts more load on the system with not much overall benefit as the attackers have adapted to it and it reduces the size of the block list. - Reduce the number of allowed concurrent connections to 2 if you're not a relay. - Use of remove.sh cron script at regular intervals (optional) will give relays a chance to create up to 4 connections if they need to. ******- Created a new cron file **refresh-authorities.sh** to refresh your allow-list with the most up to date IP addresses for the authorities and snowflake. Should be run daily. - Removed an unnecessary line in the update files. - Modified Readme.MD file to reflect new changes. The new modifications have been tested for two weeks now and the systems are running smoothly with no ill effect. You can read more and download here: [Enkidu-6 tor-ddos on Github](https://github.com/Enkidu-6/tor-ddos) To avoid occasional NTor drops a minimum NumCPUs 16 in torrc is recommended. P.S. The NumCPUs option is unfortunately poorly documented. It really has nothing to do with the number of CPUs you have. It's about the number of worker threads Tor will create to deal with decryption of onionskins. So you can have two CPUs and still set NumCPUs to 16.

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Considering running a relay on AWS Free tier
by Keifer Bly 29 Nov '22

29 Nov '22

Hi, So I don't know if I will do it, but I am considering setting up a tor middle relay on AWS free tier. I have been asking their support tem regarding how much traffic one can push and remain free tier, their response was: If your microservice application is using an RDS or Amazon DynamoDB Accelerator (DAX) database, the Lambda-to-database traffic will be free if it’s in the same region, including if VPC peering is used. Traffic to databases in a different region will incur a regional transfer fee of $0.09 per GB for both the Lambda and database egress traffic. Ingress traffic is free for both.\" I am wondering does anyone else run tor middle relays on AWS free tier, and what is the best torrc configuration to use for keeping the inbound and outbound traffic in free tier in case I do go fourth with this? Thanks. --Keifer

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Next Tor relay operator - November 19th at 19.00 UTC
by gus 23 Nov '22

23 Nov '22

Dear relay operators, The next Tor relay operator meetup will happen on Saturday, November 19th at 19.00 UTC. ## Where BigBlueButton: https://tor.meet.coop/gus-og0-x74-dzn ## Agenda (WIP) - Announcements - State of DoS attack - Q&A - Next Tor Relay Operator Meetup Meeting pad: - https://pad.riseup.net/p/tor-relay-op-meetup-n19-keep - http://kfahv6wfkbezjyg4r6mlhpmieydbebr5vkok5r34ya464gqz6c44bnyd.onion/p/tor… Everyone is free to bring up additional questions or topics at the meeting itself. ## Registration No need for a registration or anything else, just use the room-link above. We will open the room 10 minutes before so you can test your mic setup. Please share with your friends, social media and other mailing lists! cheers, Gus -- The Tor Project Community Team Lead

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Re: [tor-relays] preventing DDoS is more than just network filtering
by Toralf Förster 15 Nov '22

15 Nov '22

On 11/8/22 10:57, Chris wrote: > The main reason is that a simple SYN flood can quickly fill up your > conntrack table and then legitimate packets are quietly dropped and you > won't see any problems thinking everything is perfect with your server > unless you dig into your system logs. Hhm, my system log doesn't show any problems, maybe due to (or regardless of?): CONFIG_SYN_COOKIES=y ? Nevertheless, I updated the Readme to explain my point of view [1] [2]. [1] https://github.com/toralf/torutils#block-ddos-traffic [2] https://github.com/toralf/torutils#rule-set -- Toralf

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Tor Relay on Gandi.net
by protectmyonion 14 Nov '22

14 Nov '22

mailto:tor-relays@lists.torproject.org I was wondering if anyone had experience running a Tor relay on Gandi. According to [good-bad-isps](https://community.torproject.org/relay/community-resources/g…, Gandi supports all relays. However, I contacted support asking them their policy on Tor and if their policy was the same for all Tor relays. Their response was basically 'You can install any software you want, but its use is subject to French law and our terms of service. If a complaint is received, the Abuse department will take appropriate action and notify you.'. This was pretty vague and kind of seemed like they didn't know what Tor was. I responded and tried to explain what Tor was using most of what was in the Common Boilerplate template. I explained that there were things that I could do to reduce potential abuse, like limiting the exit policy, but that there was always still potential for abuse. The next response came from the Abuse department and basically said 'Any illegal activity on your IP will result in your server being shutdown.'. Based on this, it seems like Gandi is not a good ISP for Tor exits, but likely fine for all other relays. What's a little confusing is that according to Tor metrics, Gandi currently has Tor exits. It is only 2, but nevertheless, they exist. [France](https://metrics.torproject.org/rs.html#search/as:AS203476) location has 2 exits, but [Luxembourg](https://metrics.torproject.org/rs.html#search/as:AS29169) has none. I'm not sure if [good-bad-isps](https://community.torproject.org/relay/community-resources/g… should be updated, given there's conflicting information, but I figured I'd ask if anyone had personal experience with Gandi. Thanks.

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new bridge
by Anonforpeace 10 Nov '22

10 Nov '22

Hello: I have setup a new bridge. Relay Search confirms it is up, however I wanted to verify with you as well. The nickname is: h4ck3rspace Thank you Sent with [Proton Mail](https://proton.me/) secure email.

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Tor DDoS Mitigation iptables scripts updated to version 3.0.0
by Chris 09 Nov '22

09 Nov '22

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Middle relay and snowflake
by andrew reid 08 Nov '22

08 Nov '22

Is it possible to run a tor relay and a snowflake on the same IP. I have had the snowflake add on installed on my browser for a few months and noticed it has never gotten any traffic. Is this because of the tor relay on the same IP ?

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State of the Onion 2022
by Gaba 08 Nov '22

08 Nov '22

Hi! We're happy to announce that the State of the Onion, a livestream event highlighting updates from onion-world over the last year, is returning this month! This year, we'll State of the Onion will be a two-part event: - Wednesday, Nov 9, State of the Onion: the Tor Project @ 17:00-18:30 UTC: https://www.youtube.com/watch?v=uSyBZ7GIzJY - Wednesday, Nov 16, State of the Onion: the Tor community @ 17:00-18:30 UTC: https://www.youtube.com/watch?v=O-7k0PjnBbk Everyone is invited to hear news, accomplishments, challenges, and next steps of all the Tor Project's teams + Tor community projects during these live events. More information about the Tor Project's event in https://blog.torproject.org/state-of-the-onion-2022/ cheers, gaba -- pronouns she/her/they GPG Fingerprint EE3F DF5C AD91 643C 21BE 8370 180D B06C 59CA BD19

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preventing DDoS is more than just network filtering
by Toralf Förster 07 Nov '22

07 Nov '22

The graphs in [1] and [2] are IMO good examples related to [3]: "... in addition to network filtering, the (currently) sharp input signal ... is transformed into a smeared output response ... This shall make it harder for an attacker to gather infromation using time correlation techniques." Feedback is welcome. [1] https://github.com/toralf/torutils/blob/main/doc/network-metric.svg [2] https://github.com/toralf/torutils/blob/main/doc/network-metric-nextday.svg [3] https://github.com/toralf/torutils/tree/main#block-ddos-traffic -- Toralf

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