Policy Statement on Address Space Allocations
Alex.Bligh amb at Xara.NET
Tue Jan 30 11:48:59 CET 1996
"Robert A. Rosenberg" <hal9001 at panix.com> wrote: > At 6:09 1/29/96, Alex.Bligh wrote: > > > Currently I have 2 choices as > >far as I can make out, give them a bit of my /19, break up my > >nice aggregate and ensure loads of extra announcements (and that > >probably none of them get routed by anyone applying prefix based > >filtering), or give them a new /19 all of their own (you've > >said it, that's the minimum size allocation) which actually > >solves their problem and mine, but this isn't an option > >currently available because currently it's one window per local-IR. > >So they have to go and become a local IR. > > If the high /21 of your /19 is not Allocated, you just assign it to them > and add ONE announcement of the /21 to supersede with the current /19. If > it is not free but is sparsely populated you can move the stuff out to free > it up or go to RIPE to get your /19 turned into an /18 (ie: get the /19 > right after your current /19 [RIPE did give you the first /19 in a shorter > prefix block didn't they?]) in exchange for returning the /21 worth of > space [giving you 3 extra /21s worth of space], and divide that 2nd /19 > into a /20, and 2 /21s giving them the 2nd /21 (still doing the same 2 > announcements as you would if allocated out of your current /19). Thankyou for the first constructive workable suggestion had so far. However, this has two problems. a) RIPE fidn't give me the first /19 in a shorted prefix block ( its x.x.160.x and .192.x is used), but no matter, I'll renumber if necessary :-( or persuade them to give me a /18 as well so I can do the above (hopefully). b) The /21 advert may be inbound filtered by a.n.other, which will be fine if it has an AS-Path through me (as the less specific route will work the same way) but won't when that path goes through the other provider with whom they are multi-homed, as the /21 will disappear entirely (3rd parties, i.e. a.n.other's customers will see neither), the /19 will be the only thing that is visible, and I'll just black hole their packets. Anyway this is several times better than the swamp. Oh well. Alex Bligh Xara Networks
[ lir-wg Archives ]