在 2019/7/30 16:15, Mark Smith 写道:
Hi,
I'm not subscribed to the Linux netdev mailing list, so I can't
directly reply to the patch email.
This patch is not the correct solution to this issue.
Per RFC 4291 "IP Version 6 Addressing Architecture", all IPv6
interfaces are required to have Link-Local addresses, so therefore
there should always be a link-local address available to use as the
source address for an ND NS.
In linux implementation, one interface may have no link local address if
kernel config
*addr_gen_mode* is set to IN6_ADDR_GEN_MODE_NONE. My patch is to fix
this problem.
And what you say is related to the lo interface. I'm not sure whether
the lo interface needs a ll adreess.
IMO the ll address is used to get l2 address by sending ND ns. The lo is
very special.
Thanks
Su
"2.1. Addressing Model"
...
"All interfaces are required to have at least one Link-Local unicast
address (see Section 2.8 for additional required addresses)."
I have submitted a more specific bug regarding no Link-Local
address/prefix on the Linux kernel loopback interface through RedHat
bugzilla as I use Fedora 30, however it doesn't seem to have been
looked at yet.
"Loopback network interface does not have a Link Local address,
contrary to RFC 4291"
https://bugzilla.redhat.com/show_bug.cgi?id=1706709
Thanks very much,
Mark.
