On Mon, Jan 29, 2007 at 09:19:50AM +0100, Tonnerre LOMBARD wrote: > Salut, > > On Sun, Jan 28, 2007 at 12:26:11PM +0100, Almir Karic wrote: > > they said the SAME thing about ipv4.... :/ > > The big problems of IPv4 aren't address space problems but performance > problems. There are two big issues: > > 1. deaggregation. A lot of small nets clog up the pipe which don't have > to be announced separately when distributed appropriately. Solution: > give every customer as many IPs that he'll never have to come back for > more. >
Deaggregation is actually more of a dumb ISP problem. It will happen with IPv6 as well. Btw. while deaggregation causes huge BGP routing tables it has a smaller effect on HW accelerated FIBs. On high performance routers the FIB is compiled/compressed to be as small as possible the reduction is normaly quite dramatic because only a handfull of nexthops are used. Note: the OpenBSD routing table does not do that. > 2. Routing header parsing. IPv4 uses variable length headers, which involves > more overhead than IPv6, who puts extensions into the extension header, > so the routing header parsing involves no special logic. > While IPv6 has a static header size it uses header stacking and so every router has to do the same stupid header parsing that needs tons of special logic. -- :wq Claudio
