> If you have hardware with a built-in switch that can report the link-speed,
The WNDR3700v2 under OpenWRT appears to do so:
# swconfig dev switch0 show | grep 'link:'
link: port:0 link:down
link: port:1 link:down
link: port:2 link:up speed:100baseT full-duplex
link: port:3 link:down
link: port:4 link:down
link: port:5 link:up speed:1000baseT full-duplex txflow rxflow auto
but to use this information, you need to know:
1. that vlan1 on eth0 is connected to ports 0 through 3 of switch0;
2. that neighbour fe80::dead:beef is connected over port 2.
You could do (1) with a small amount of model-specific code (yuck), but
I have no idea how to do (2). Consult the ND cache to find out the
neighbour's MAC, then find a way to snoop on the switch's forwarding table?
-- Juliusz
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