Thanks for the feedback. Some responses: 1) I'm glad that people are seeing reasonable speeds from the VPS. (I don't know what I can do to make it go faster, so I'm relieved...)
2) I don't think I posed the right question for the number-of-tests threshold. (Most of the responses were like, "Sure, that sounds like enough..." Let me reframe the question: In your normal testing/troubleshooting process, what is the maximum number of tests YOU might need to run in any two-day period? 3) If you can't get through to netperf.bufferbloat.net, send me your IP address because it might have been blacklisted. Thanks! Rich > On Oct 6, 2020, at 6:52 AM, Rich Brown <richb.hano...@gmail.com> wrote: > > To the Bloat list, > > I had some time, so I looked into what it might take to keep the > netperf.bufferbloat.net server on-line in the face of an unwitting "DDoS" > attack - automated scripts that run tests every 5 minutes 24x7. The problem > was that these tests would blow through my 4TB/month bandwidth allocation in > a few days. > > In the past, I had been irregularly running a set of scripts to count > incoming netperf connections and blacklist (in iptables) those whose counts > were too high. This wasn't good enough: it wasn't keeping up with the tidal > wave of connections. > > Last week, I revised those scripts to work as a cron job. The current > parameters are: run the script every hour; process the last two days' of > kern.log files; look for > 500 connections; drop those addresses in iptables. > > There are currently 479 addresses blacklisted in iptables (that explains why > the bandwidth was being consumed so quickly). There are only a few new > addresses being added per day, so it seems that we have flushed out most of > the abusers. > > My questions for this august group: > > 1) The server at netperf.bufferbloat.net is up and running. I get full rate > speed from my 7mbps DSL circuit, but that's not much of a test. I would be > interested to hear your results. > > 2) The current threshold comes from this estimate: most speed tests use 10 > connections: 5 connections up and 5 down. So 500 connections would permit > about 50 tests over the course of two days. Is that enough for "real > research"? (If you need more, I can add your address to my whitelist file...) > > 3) I would be pleased to get comments on the set of scripts. I'm a newbie at > iptables, so it wouldn't hurt to have someone else check the rules I devised. > See the README at https://github.com/richb-hanover/netperfclean > > Thanks. > > Rich > _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat