Re: [homenet] sorting out the right ipv6 addr to choose and name in a source specific world

[Brian E Carpenter <[e-mail]>]

On 22/12/2014 08:44, Juliusz Chroboczek wrote:
>>>> You might also need to combine the features of the gateway with the
>>>> metric(s) of the path to the gateway.
> 
>>> I do end-to-end measurements in my mosh implementation, so we should
>>> not have the problem.
> 
>> Does this really scale well?
> 
> How well do we need it to scale?  Three addresses per host?  A dozen?
> A hundred?  (Per host, mind you -- not per router.)
> 
> The probes Matthieu's code is sending are less than 90 bytes each.  This
> means that if the client and the server have three addresses each, each
> probing episode consists of a burst of 9 packets totalling less than one
> full Ethernet frame.  (18 if you count the replies.)
> 
> On the other hand, if we end up having hundreds of addresses on every
> host, the strategy will need to be rethought.  Dave is currently playing
> with a network where each host has 10 addresses of different kinds, and
> he's trying to work out heuristics to limit the number of probes.  I'd
> personally prefer to gather some empirical data before we start optimising
> things.

A good thought. From the point of view of usefulness, more than two or
three addresses per host seems pretty pointless (that is at any rate
what draft-naderi-ipv6-probing told us). Probe results should probably
be cached for a while and interpreted per-prefix not per-address.

   Brian