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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Pitfalls of annoucing /24s
I have a /24 allocated to my by XO Communications in Phoenix, AZ (67.X.X.0/24). I am currently announcing it to Verio in Europe. A friend of mine that is an XO customer in Phoenix with BGP to XO can get to that address block within XO's network. But on the flip side. I also have a /22 from AT&T (12.X.X.0/22). When I announce that network block to Verio in Europe (and nowhere else), only certain places get to the Europe location. Networks that prefer AT&T go to AT&T's network and die since the route isn't there. I don't know if I am missing something but it think it may have to do with how the network's peering/filter schemes work. I may just be walking around the problem since I am a transit customer of Verio and they normally filter. -Andy --- Phil Rosenthal <[email protected]> wrote: > > On Oct 15, 2003, at 5:24 PM, H. Michael Smith, Jr. wrote: > > > > > > > What about the /24's that many ISPs (especially tier 2-3) are > assigning > > to multi-homed customers? What about an IX or "critical > infrastructure > > providers" that may be issued a /24 from ARIN (Policy 2001-3)? > > > As long as it's provider assigned, and your provider announces the > supernet that the /24 is from, it will still work. If you announce > PI > space out of the old class A space in /24's, many networks wont be > able > to reach you. >
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