> On 18 Jan, 2016, at 18:14, Michael Richardson <m...@sandelman.ca> wrote: > > Jonathan Morton <chromati...@gmail.com> wrote: >> I haven’t yet found a robust way to automatically sense link capacity from >> the upstream side. You’ll therefore need to set a conservative static >> value for the uplink capacity. > > As the maintainer of a PPPoE concentrator, and operator of some networks, > I've been considering whether one can estimate the bandwidth using round > trip PPP IPCP keep alives. Clearly, if both ends participate in time > stamping then it is much better, but I've been wondering if we can do some > incremental deployment on one side or the other. > > Sadly, I mostly just think about this while cycling; I haven't written any > code yet.
In most PPPoE deployments I know about, there is also a modem from which the actual, precise link rates can usually be queried. Where that’s not the case, IPCP (or is it LPCP?) probes would be a reasonable workaround, but it must still be understood that the signal it provides is only valid under saturating traffic, which complicates implementation. - Jonathan Morton _______________________________________________ Cerowrt-devel mailing list Cerowrt-devel@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cerowrt-devel
