Messages in this thread | | | Subject | Re: [PATCH v3 net-next 1/1] Allow user to set metric on default route learned via Router Advertisement. | From | David Ahern <> | Date | Fri, 22 Jan 2021 22:16:41 -0700 |
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On 1/22/21 9:02 PM, Maciej Żenczykowski wrote: > Why can't we get rid of the special case for 0 and simply make 1024 the > default value?
That would work too.
> > As for making it an RA option: it's not clear how that would work, the > use case I see for this is for example two connections to the internet, > of which one is clearly better (higher throughput, lower latency, lower > packet loss, etc) then the other. > > The upstream routers would have to somehow coordinate with each other > the metric values... that seems impossible to achieve in practice - > unless they do something like report expected down/up > bandwidth, latency, etc... While some sort of policy on the machine > itself seems much more feasible (for example wired interface > wireless > interface > cell interface or something like that)
I was thinking the admin of the network controls the RAs and knows which paths are preferred over the admin of the node receiving the RA (not practical for a mobile setup with cell vs wifi, but is for a DC which is the driving use case).
But it takes an extension to IPv6/ndisc to add metric as an RA option, so not realistic in a reasonable time frame.
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