Am Wed, 21 Sep 2016 21:29:13 +0200 schrieb Kai Krakow <hurikha...@gmail.com>:
> Am Wed, 21 Sep 2016 07:30:40 -0700 > schrieb Grant <emailgr...@gmail.com>: > > > [...] > > [...] > [...] > > > > > > If that device behaves badly in router mode by blocking just all > > > icmp traffic instead of only icmp-echo-req, this is a good idea. > > > You may want to bug AT&T about this problem then. It should really > > > not block related icmp traffic. > > > > > > Hi Kai, yesterday I switched my Gentoo router over to handling PPPoE > > and pings seem to be working properly now. The AT&T device is now > > functioning as a modem only and passing everything through. Today > > I'll find out if it helps with TCP Queuing and (supposedly) related > > http response slowdowns. > > You may want to set the default congestion control to fq-codel (it's > in the kernel) if you're using DSL links. This may help your problem a > little bit. It is most effective if you deploy traffic shaping at the > same time. There was once something like wondershaper. Trick is to get > the TCP queuing back inside your router (that is where you deployed > pppoe) as otherwise packets will queue up in the modem (dsl modems use > huge queues by default). This works by lowering the uplink bandwith to > 80-90% of measured maximum upload (the excess bandwidth is for short > bursts of traffic). Traffic shaping now re-orders the packets. It > should send ACK and small packets first. This should solve your > queuing problem. > > Between each step check dslreports.com for bufferbloat. I'm guessing > it is currently way above 1000 ms while it should stay below 20-50 ms > for dsl. > > The fq-codel congestion control fights against buffer bloat. But it > can only effectively work if you're doing traffic shaping at least on > your uplink (downlink may or may not be worth the effort depending on > your use-case). > > Additionally, you can lower the priority of icmp-echo-reply this way > so during icmp flooding your uplink will still work. > > This link may help you: > https://www.bufferbloat.net/projects/codel/wiki/Cake/ And this: https://github.com/tohojo/sqm-scripts -- Regards, Kai Replies to list-only preferred.
