Hello!
> It appears you can add _exactly_ same IPv6 address on an interface many
> times:
Yes. BTW, look here:
kuznet@dust:~ # ip -6 a ls sit0
7: sit0@NONE: <NOARP,UP> mtu 1480 qdisc noqueue
inet6 ::127.0.0.1/96 scope host
inet6 ::193.233.7.100/96 scope global
inet6 ::193.233.7.100/96 scope global
I have two equal addresses inherited from one IPv4 address
on two interfaces. Nothing illegal.
> FWIW, KAME stack adds the address only once(, but BSD ifconfig(8)
> doesn't show errors when you try to do it again; just doesn't add the
> second one).
8)
> It looks like a check or two in kernel is missing, or is there some
> reasoning to this behaviour?
Well, it is one of well defined approaches (unlike KAME's one).
Alternative is to implement full set of options NLM_F_* like used
in IPv4 routing to block undefined cases. In IPv6 flags are hardwired
to NLM_F_CREATE|NLM_F_APPEND both for addresses and routes.
Alexey
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This archive was generated by hypermail 2b29 : Tue May 15 2001 - 21:00:32 EST