nanog mailing list archives
Re: v6 subnet size for DSL & leased line customers
From: "Robert E. Seastrom" <rs () seastrom com>
Date: Thu, 27 Dec 2007 21:50:01 -0500
Leo Bicknell <bicknell () ufp org> writes:
In a message written on Thu, Dec 27, 2007 at 10:57:59PM +0100, Iljitsch van Beijnum wrote:It is wih IPv6: you just connect the ethernet cable and the RAs take care of the rest. _You_ _really_ _don't_ _need_ _DHCP_ _for_ _IPv6_. If you need extreme control then manual configuration will give you that, which may be appropriate in some cases, such as servers.Really. I didn't know RA's could: - Configure NTP servers for me. - Tell me where to netboot from. - Enter dynamic DNS entries in the DNS tree for me. - Tell me my domain name. - Tell me the VLAN to use for IP Telephony. Those are things I use on a regular basis I'd really rather not manually configure.
I'm running (native) IPv6 at home, and in the colo too. Most of my ssh sessions to personally owned machines go over v6. My laptops (with a single exception) are Macs. You may not be aware that the Mac is fairly smart about which interface it uses for connections - it will prefer the gigabit ethernet to the wireless when it sees link... it prefers wireless to dialup too. Basically, whenever you establish a new outgoing session it will use the "lowest cost" interface to do the deed. For IPv4, I have the same address manually assigned on the DHCP server to both the gigabit ethernet's MAC address and the wireless interface's MAC address. This means that when I plug into the gige, as I do for filesharing or backing some files up, the Mac uses the gigabit ethernet. When I unplug and carry the Mac to the conference room, *all existing upper layer sessions are preserved* - TCP and friends are blissfully unaware that a change has taken place; one gratuitous arp so the router knows where to send the packets and we're on our way again with nary a hiccup. I don't have an ssh session croak just because I connected or disconnected a cable. I'd really, really, really like to have DHCP6 on the Mac. Autoconfig is not sufficient for this task unless there is some kind of trick you can do to make the eui-64 come out the same for both interfaces (don't think so). Anyone from Apple reading this list? :-) ---Rob
Current thread:
- Re: v6 subnet size for DSL & leased line customers, (continued)
- Re: v6 subnet size for DSL & leased line customers Iljitsch van Beijnum (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Mark Smith (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Mark Smith (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Leo Bicknell (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Christopher Morrow (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Iljitsch van Beijnum (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Mark Smith (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Leo Bicknell (Dec 27)
- [DCHPv6] was Re: v6 subnet size for DSL & leased line customers James R. Cutler (Dec 27)
- Re: [DCHPv6] was Re: v6 subnet size for DSL & leased line customers David Barak (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Robert E. Seastrom (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Marshall Eubanks (Dec 27)
- Re: v6 subnet size for DSL & leased line customers Mark Smith (Dec 28)
- Re: v6 subnet size for DSL & leased line customers Robert E. Seastrom (Dec 29)
- Re: v6 subnet size for DSL & leased line customers Joe Maimon (Dec 26)
- Re: v6 subnet size for DSL & leased line customers Mikael Abrahamsson (Dec 22)
- Re: v6 subnet size for DSL & leased line customers Joe Greco (Dec 23)
- Re: v6 subnet size for DSL & leased line customers Joel Jaeggli (Dec 23)
- Re: v6 subnet size for DSL & leased line customers Joe Greco (Dec 24)
- Re: v6 subnet size for DSL & leased line customers Joel Jaeggli (Dec 24)
- Re: v6 subnet size for DSL & leased line customers Randy Bush (Dec 25)