On Tue, May 15, 2007 at 10:47:28AM +0100, Nick Hilliard wrote:
bmanning@karoshi.com wrote:
On Mon, May 14, 2007 at 01:30:01PM +0100, Nick Hilliard wrote:
Other than by issuing bogon lists, where the ULA-centra prefixes will be noted. You certainly can't stop it or any other type of ipv6 address from becoming PI. But you can stop it from being useful PI space, which is all you need to do.
Nick
you, my friend, have an over inflated view of your ability to effect "useful" for others. imho of course.
I make no claim of any such ability :-)
er... perhaps I misread. you stated; "you can stop it from being useful PI space, which is all you need to do." i understand this as you (party Q) being able to effect any communications between myself (party R) and Gert (party S)... the single time this is effective is when party Q is in the transit path btwn R & S.
The point is, if a block is carved out and marked specifically as being non-routable on the public v6 internet, it will have degraded connectivity to some degree or other.
do i care? does that effect the usefulness of a given prefix if some ISP someplace filters out (refuses to listen) to the announcements? i posit that: a) i have zero influence on your operational behaviour when i have zero business relationship w/ you b) you have the ability to set whatever policies you like for packet acceptance into your network and packet egress from your network.
On a related issue, I'd be interested to know what the reachability degradation was like for the last of the 3ffe:: space after 6/6/6? You didn't happen to do any measurements on it?
for those parties still using the space, it is useful. i suspect that parties who filter prefixes "degrade" their clients ability to reach nodes/content in those filtered ranges. of course some clients utilize other tools (VPNs, tunnels, etc) to bypass crippled ISP thinking. (from the POV of the client ... kind of like many hotel networks) your general qustion (prefix reachability) is based on (imho again) a flawed premise... if i may, could you clarify the two endpoints for such a reachability study?
Nick, psychically effecting usefulness all over the v6 internet
got me there... can you also bend spoons w/ your mental powers? :) --bill