<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Sep 14, 2010, at 2:21 PM, Lee Howard wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Excellent question.<br>We keep spinning around the question of "what if we groom a customer to a different edge router?" DHCP assignments come from DHCP pools based on the source address of the relay router (i.e., edge router). Even if the home gateway knows to request a new prefix when its link comes up on a new router, the devices in the home don't know that their prefix has changed.<br><br></div></div></div></span></blockquote>If they're configured by DHCP or SLAAC as they should be in most cases, yes, they do.</div><div><br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Maybe the home gateway should expect to send a DHCP Reconfigure if it acquires a new prefix after a link state change? Assuming the link actually bounces in a groom, that is.<br><br></div></div></div></span></blockquote></div><div>Doesn't DHCPv6 already require a router that receives a new DHCP-PD to notify its existing leasholders?</div><div><br></div><div>I thought it did, but, I would have to review the RFC to be sure.</div><div><br></div><div><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">How does your edge router know the next hop of the DHCP prefix? Snoop the DHCP packet? I think we should resurrect<span class="Apple-converted-space"> </span><a href="http://tools.ietf.org/html/draft-ietf-dhc-dhcpv6-agentopt-delegate-04">RAAN</a>, but since it expired I'm not sure there's support. Just MHO, of course.<br><br></div></div></div></span></blockquote>I'm not sure what you're asking here. The DHCP Prefix Delegation comes after an RA has already</div><div>been received instructing the router to request addressing via DHCP. The RA covers the next hop</div><div>information.</div><div><br></div><div>Owen</div><div><br></div></body></html>