"Robert A. Rosenberg" <hal9001@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