On Wed, 13 Jun 2001, Seth M. Kusiak wrote:
I've been told by many that most national providers filter any prefix greater then a /20 such as sprint and verio.
-Seth
David McGaugh writes:
/24's are sufficient to multihome with most if not all providers out there. Why not conventionally multi-home to 2 large well established providers?
-Dave
Filters depend on where you get your allocation. We got 216.249.16.0/20 from arin. Since we're above the swamp, we have a greater chance of having any given /24 not be filtered. Shortly after we got the allocation, I announced a single /24, and could cleanly traceroute to machines on that subnet from points behind sprint, verio, C&W, worldcom, etc. Had we been given an allocation from 65/8 or another block in former-class-A space, we probably would've had problems. FWIW, what I've heard is that most people like Verio who used to have painfully strict filtering policies have reverted to something a little better. Personally I've seen no impact on filtering, we renumbered our production networks out of the GBLX/GBLC/Exodus-owned and aggregated space (64.209.175.0/24 and 64.210.164.0/23) into our own /22 in 216.249.16.0, and usage is still increasing. We've also heard no complaints of unreachability. -j -- -Jonathan Disher -Sr. Systems and Network Engineer, Web Operations -Internet Pictures Corporation, Palo Alto, CA -[v] (650) 388-0497 | [p] (877) 446-9311 | [e] jdisher@eng.ipix.com