nanog mailing list archives
Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum
From: Alain Durand <alain_durand () cable comcast com>
Date: Tue, 19 Aug 2008 13:45:49 -0400
On 8/19/08 1:36 PM, "Nathan Ward" <nanog () daork net> wrote:
64 bits is not a magical boundary. 112 bits is widely recommended for linknets, for example. 64 bits is common, because of EUI-64 and friends. That's it. There is nothing, anywhere, that says that the first 64 bits is for routing.
Actually, there is text that says so: RFC4291: IPv6 Addressing Architecture, section 2.5.1 " For all unicast addresses, except those that start with the binary value 000, Interface IDs are required to be 64 bits long and to be constructed in Modified EUI-64 format." The fact that most implementations ignore this is a different story. In practice, many routers require the packet to go twice in the hardware if the prefix length is > 64 bits, so even though it is a total waste of space, it is not stupid to use /64 for point-to-point links and even for loopbacks! - Alain.
Current thread:
- RE: It's Ars Tech's turn to bang the IPv4 exhaustion drum, (continued)
- RE: It's Ars Tech's turn to bang the IPv4 exhaustion drum Antonio Querubin (Aug 18)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Iljitsch van Beijnum (Aug 18)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Justin M. Streiner (Aug 18)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Iljitsch van Beijnum (Aug 18)
- RE: It's Ars Tech's turn to bang the IPv4 exhaustion drum TJ (Aug 18)
- RE: It's Ars Tech's turn to bang the IPv4 exhaustion drum michael.dillon (Aug 19)
- RE: It's Ars Tech's turn to bang the IPv4 exhaustion drum Justin M. Streiner (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Michael Thomas (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Randy Bush (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Nathan Ward (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Alain Durand (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Randy Bush (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Kevin Loch (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Iljitsch van Beijnum (Aug 20)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Sam Stickland (Aug 21)
- RE: It's Ars Tech's turn to bang the IPv4 exhaustion drum Miya Kohno (Aug 21)
- RE: It's Ars Tech's turn to bang the IPv4 exhaustion drum TJ (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Seth Mattinen (Aug 19)
- Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum Tony Finch (Aug 19)
- RE: It's Ars Tech's turn to bang the IPv4 exhaustion drum michael.dillon (Aug 20)