[Cerowrt-devel] routers you can throw off the back of a truck
mcr at sandelman.ca
Mon Jan 18 20:06:26 EST 2016
Jonathan Morton <chromatix99 at gmail.com> wrote:
>> Jonathan Morton <chromatix99 at 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
Yes, you are rtight, I want to do LPCP echo requests.
The modem might know what speed it has with the tower/DSLAM, but won't know how
congested the backhaul link is. There are some third party/white label 3G
arrangements in Canada that use PPP/L2TP back to the third-party provider,
but most route the IPv4 (only) packets via IPsec or MPLS.
] Never tell me the odds! | ipv6 mesh networks [
] Michael Richardson, Sandelman Software Works | network architect [
] mcr at sandelman.ca http://www.sandelman.ca/ | ruby on rails [
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