Hello,
I've been trying to wrap my head around the differences between address
resolution in IPv6 and IPv4 and I'm a bit confused by a real-world issue
I'm seeing in a colo facility where we have dual-stack connectivity.
Basically, what I see is summed up in this recent post:
http://freebsd.1045724.n5.nabble.com/Proper-way-to-setup-IPv6-gateway-on-running-node-without-reboot-td4313847.html
If I manually configure a static IPv6 IP and then set a default route for
a router on the same subnet, ie:
ifconfig em0 inet6 2001:xxx:xxxx::2/48
route add -inet6 default 2001:xxx:xxxx::1
I have no issues pinging other hosts on the subnet (which also have static
IPs and manually configured gateways), but I find that address resolution
for the router is spotty at best. If I start and maintain a ping from the
host to the router, the first few packets are lost, then traffic flows.
If I'm pinging from an outside host, once I stop the ping from the host to
the gateway, the external ping fails shortly thereafter.
I can also get traffic to flow to the gateway briefly by running "rtsol
em0", but after a few minutes it stops.
Now following the steps in the thread linked above works, and what that
basically has you do is enable link-local addresses, down/up the
interface, and then all is well.
Can anyone help me understand what the relationship is between address
resolution for the router and link-local? Why is this required? Why can
I ping other hosts on the subnet without enabling link-local? I
understand link-local is needed for *automatic* router discovery, but in
my case I'm explicity setting a default route.
I'm having a hard time finding good docs on this, most tutorials seem to
center around a tunneling setup or simple autoconfigured LAN stuff - no
one's really addressing typical colo/datacenter configs. I've got my
workaround, but I'd like to understand what's going on.
Thanks,
Charles
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