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</o:shapelayout></xml><![endif]--></head><body lang=RU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>Hi Simon,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>Latets git (2.61test7) brings several RA issues,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>My configuration (simplified):<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>HAVE_DHCP, HAVE_DHCPv6, HAVE_BROKEN_RTC<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>interface=br0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>dhcp-range=192.168.1.101,192.168.1.254,86400<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>dhcp-range=2001:470:xxxx:xxxx::,ra-only,64,2h<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>dhcp-option=option6:23,[::]<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>I was trying to setup dual-stack environment with IPv6 SLAAC and DNS via DHCPv6<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>Usually it’s done by specifying Other bit in RA, while Managed is switched off. This allows host to configure address from the prefix, but ask DNS, Domain, etc via DHCPv6.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>Unfortunately, this config is quite impossible now, refer issues list:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Times New Roman","serif"'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-family:"Times New Roman","serif"'>M+O bits are set if dhcv6 enabled only, and no bits set, if disabled. That means bits is always cleared with ra-only/ra-names, no matter set dhcp6 options or not.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Times New Roman","serif"'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-family:"Times New Roman","serif"'>Dhcp6 options without range will not create contexts, therefore dnsmasq doesn’t listen dhcp6 requests. So, without this pt.1 enhancement is pointless.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Times New Roman","serif"'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-family:"Times New Roman","serif"'>Periodic RA isn’t working, because alarm code goes into (dhcp || dhcp6) path and don’t trigger RA alarms<o:p></o:p></span></p><p class=MsoListParagraph><span lang=EN-US style='font-family:"Times New Roman","serif"'>Only other netlink/dhcpv4 events could trigger it. Also, even if fixed event logic leads to DHCP leases rewrite on every RA event by design.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Times New Roman","serif"'><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-family:"Times New Roman","serif"'>Router Solicitation messages doesn’t trigger send RA, due 2 reasons: icmp6fd isn’t in read fdset , and icmp6fd socket isn’t joined to ALL_ROUTERS group.<o:p></o:p></span></p><p class=MsoListParagraph><span lang=EN-US style='font-family:"Times New Roman","serif"'>All this because there’s no dhcp6 context configured for ra-only/ra-names<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>About prefix lifetimes, you refer rfc2462 in the code which is obsoleted by rfc4862.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>2 hours rules is only about Valid Lifetime, but Preferred Lifetime might be and usually is much smaller in dynamic v6 prefix environments.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>The problem is dnsmasq doesn’t use separate valid/preferred values, this leads to default gateway lost issue due some “server” reconfiguration when client still threat 2h prefix is valid and preferred.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>Not related to subject, but have to say.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>With HAVE_BROKEN_RTC lease file doesn’t contain expire time, but length, which is constant.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>So, after restart/reload all leases get prolonged lease time, and possibly never expired then.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'>Solution is quite simple – store not only lease length, but calculated remaining time too. With this values it’s possible to correct count all previous timings.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif";mso-fareast-language:RU'>Best Regards, Vladislav Grishenko<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif";mso-fareast-language:RU'>ICQ: 303357<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif";mso-fareast-language:RU'>MSN: themiron@mail.ru<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif";mso-fareast-language:RU'>Skype: the.miron<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>