>-----Original Message----- >From: Pekka Savola [mailto:[EMAIL PROTECTED] >Sent: Thursday, October 30, 2008 12:26 AM >To: [EMAIL PROTECTED] >Cc: [email protected]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; >[EMAIL PROTECTED]; [EMAIL PROTECTED]; >[EMAIL PROTECTED] >Subject: Re: [dhcwg] /128 address allocation and "localized >IPv6 addressspace exhaustion",was RE: Brokenness of specs >w.r.t. client behavior with M&O bits > >On Thu, 30 Oct 2008, [EMAIL PROTECTED] wrote: >>>> Consider cellular host case: >>>> - host implements e.g. ND proxy and DHCPv6 PD for WAN connection >>>> sharing >>>> - host attaches to a network where only DHCPv6 happens to be used >>>> - host gets single /128 IPv6 address from DHCPv6 >>>> - host tries to get some prefixes for its LAN interface with DHCPv6 >>>> PD, but network's policy rejects the prefix request >... >> IMHO network that is giving out only /128 to hosts that are providing >> "network sharing feature" is forcefully creating "localized >IPv6 address >> space exhaustion scenario" for the hosts, which I fear may be tackled >> with mechanisms familiar from IPv4 address exhaustion scenarios, i.e. >> with IPv6 NAPT. > >FWIW, I agree this would be a problem. > >But, maybe there is an implementable workaround to this operational >issue. Would it be possible for the host to either 1) run DHCPv6 >again, with a different DUID or client identifier (could it get more >/128's that way, or 2) use DHCPv6 IAs to request multiple addresses? >Then it would proxy these specific addresses instead of a whole /64. >If neither of these is possible, how would this scenario be different >from the mobile terminal operating as a L2 bridge and multiple devices >behind it requesting addresses with DHCPv6?
I have a couple of related questions regarding /128s: 1) can a requesting router use DHCPv6 prefix delegation to obtain /128's from a delegating router? 2) Must a requesting router examine the M&O bits in another router's RAs before determining that DHCPv6 PD can be used? Thank you, Fred [EMAIL PROTECTED] > >-- >Pekka Savola "You each name yourselves king, yet the >Netcore Oy kingdom bleeds." >Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings >_______________________________________________ >dhcwg mailing list >[EMAIL PROTECTED] >https://www.ietf.org/mailman/listinfo/dhcwg > -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
