Re: [dhcwg] Prefix-length of an assigned address, in a DHCPv6 message
"Hemant Singh (shemant)" <shemant@cisco.com> Wed, 10 September 2014 10:57 UTC
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From: "Hemant Singh (shemant)" <shemant@cisco.com>
To: "Bernie Volz (volz)" <volz@cisco.com>, Ralph Droms <rdroms.ietf@gmail.com>, Simon Hobson <linux@thehobsons.co.uk>
Thread-Topic: [dhcwg] Prefix-length of an assigned address, in a DHCPv6 message
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Date: Wed, 10 Sep 2014 10:57:02 +0000
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Subject: Re: [dhcwg] Prefix-length of an assigned address, in a DHCPv6 message
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Few years back, in the 6man mailer, we have discussed this issue. If the router has different prefix length than what the DHCPv6 server assigned to the client, who wins? Hemant -----Original Message----- From: dhcwg [mailto:dhcwg-bounces@ietf.org] On Behalf Of Bernie Volz (volz) Sent: Tuesday, September 09, 2014 11:28 PM To: Ralph Droms; Simon Hobson Cc: dhcwg Subject: Re: [dhcwg] Prefix-length of an assigned address, in a DHCPv6 message Perhaps it has been raised already in this thread, but there is again a draft on using DHCPv6 for some ND aspects: http://datatracker.ietf.org/doc/draft-sarikaya-dhc-dhcpv6-raoptions-sadr I am not advocating this work, just pointing out it is yet another attempt to distribute prefix information via DHCPv6. There already has been an email discussion with the author that this work is probably best done in another WG (if at all). - Bernie -----Original Message----- From: dhcwg [mailto:dhcwg-bounces@ietf.org] On Behalf Of Ralph Droms Sent: Tuesday, September 09, 2014 4:35 PM To: Simon Hobson Cc: dhcwg Subject: Re: [dhcwg] Prefix-length of an assigned address, in a DHCPv6 message Simon ... On Sep 9, 2014, at 12:14 PM 9/9/14, Simon Hobson <linux@thehobsons.co.uk> wrote: > Perhaps it's just me struggling to break out from "IPv4 thinking", but I struggle to see what use an IPv6 address is without explicitly or implicitly a prefix length to go with it. Unless you restrict yourself to "on link" communications, at some point you need to work out whether, when using that address, the other address you wish to communicate with is local (on link) or remote. The way I think about IPv6 addresses, prefixes and prefix length is that the prefix length is associated with the prefix, not the address. In typical usage, the prefix is matched against the leftmost bits of the address corresponding to the prefix length and a match indicates the address is in the subnet defined by the prefix. In my opinion, the "IPv4 thinking" is the association of a prefix length with an address, implicitly defining a prefix; for example, an on-link prefix derived from an assigned address. In IPv6, prefixes and addresses are more clearly delineated and the prefix lengths are associated explicitly with the prefixes. > > I know there's the arguments that in many large organisations, the routers and DHCP servers are managed by different groups - but the groups still need to agree on what the prefixes and prefix lengths are for any network ! Yes, there need to be agreement - and the agreed upon conventions are typically expressed in ND PIOs, which give the lengths for the advertised prefixes. - Ralph > > _______________________________________________ > dhcwg mailing list > dhcwg@ietf.org > https://www.ietf.org/mailman/listinfo/dhcwg _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www.ietf.org/mailman/listinfo/dhcwg _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] New Version Notification for draft-dhcwg-… Bernie Volz (volz)
- Re: [dhcwg] New Version Notification for draft-dh… Alexandru Petrescu
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Alexandru Petrescu
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Ralph Droms
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Alexandru Petrescu
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Ole Troan
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Ralph Droms
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Alexandru Petrescu
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt 神明達哉
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Alexandru Petrescu
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Ralph Droms
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Alexandru Petrescu
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Ole Troan
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Ralph Droms
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Ralph Droms
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Alexandru Petrescu
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Alexandru Petrescu
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt 神明達哉
- Re: [dhcwg] draft-dhcwg-dhc-rfc3315bis-02.txt Alexandru Petrescu
- [dhcwg] Prefix-length of an assigned address, in … Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… 神明達哉
- Re: [dhcwg] Prefix-length of an assigned address,… Fernando Gont
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… 神明達哉
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Bernie Volz (volz)
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Hemant Singh (shemant)
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Hemant Singh (shemant)
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Hemant Singh (shemant)
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… sthaug
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Sten Carlsen
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Sten Carlsen
- Re: [dhcwg] Prefix-length of an assigned address,… Chuck Anderson
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Hemant Singh (shemant)
- Re: [dhcwg] Prefix-length of an assigned address,… sthaug
- Re: [dhcwg] Prefix-length of an assigned address,… sthaug
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… Ted Lemon
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Hemant Singh (shemant)
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Ralph Droms
- Re: [dhcwg] Prefix-length of an assigned address,… sthaug
- Re: [dhcwg] Prefix-length of an assigned address,… Hemant Singh (shemant)
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Hemant Singh (shemant)
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… sthaug
- Re: [dhcwg] Prefix-length of an assigned address,… Simon Hobson
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… sthaug
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… Alexandru Petrescu
- Re: [dhcwg] Prefix-length of an assigned address,… sthaug