ietf
[Top] [All Lists]

RE: IPv6 Zone Identifiers Considered Hateful

2012-03-21 12:49:24
From: Sabahattin Gucukoglu [mail(_at_)sabahattin-gucukoglu(_dot_)com]

[...] when I ping one from the other using link-local-scoped
addresses, I have to put in this zone identifier (%ifname on BSD and
Linux).
[...]
Can't it figure it out itself?

OK, I know nothing about the subject, but when I do "ifconfig" I get:

    eth0      Link encap:Ethernet  HWaddr 00:16:35:AF:82:03  
              inet addr:135.55.22.90  Bcast:135.55.22.255  Mask:255.255.255.0
              inet6 addr: fe80::216:35ff:feaf:8203/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              [...]

Looking at the link-local address, it appears to be constructed from
the interface's MAC address, and basically nothing else.

This suggests that the link-local address of another system on an
attached network would contain that system's MAC address, but nothing
to identify which network, and thus, *this* system has no algorithmic
way to determine which interface goes to the proper network.

Dale