nanog mailing list archives
Re: Android and DHCPv6 again
From: Enno Rey <erey () ernw de>
Date: Wed, 7 Oct 2015 07:20:47 +0200
Hi, On Tue, Oct 06, 2015 at 08:59:14PM -0430, Alejandro Acosta wrote:
Hello, This is a question a should test myself but anyhow I would like to hear your comments. What happen (on the client side/Android maybe) if I advertise the DNS information in the RA and I also enable the O bit?
depends on the OS the client is running, see https://www.ernw.de/download/ERNW_Whitepaper_IPv6_RAs_RDNSS_DHCPv6_Conflicting_Parameters.pdf & https://www.ernw.de/download/ERNW_RIPE70_IPv6_Behavior_Conflicting_Environments_v0_92_short.pdf best Enno
Thanks, Alejandro, El 10/6/2015 a las 8:39 PM, Bruce Horth escribi??:Your device may be getting an address, but without a recursive DNS server it may be useless. If you're going to do SLAAC you'll also need to supply your client with a recursive DNS server. Android prefers RFC 6106. As you mentioned, Google has decided not to support DHCPv6 in Android. Unfortunately some router manufacturers are only now getting around to implementing RFC 6106. BH On Sat, Oct 3, 2015 at 9:52 PM, Baldur Norddahl <baldur.norddahl () gmail com> wrote:Hi I noticed that my Nexus 9 tablet did not have any IPv6 although everything else in my house is IPv6 enabled. Then I noticed that my Samsung S6 was also without IPv6. Hmm. A little work with tcpdump and I got this: 03:27:15.978826 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 120) fe80::222:7ff:fe49:ffad > ip6-allnodes: [icmp6 sum ok] ICMP6, router advertisement, length 120 hop limit 0, Flags [*managed*, other stateful], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s source link-address option (1), length 8 (1): 00:22:07:49:ff:ad mtu option (5), length 8 (1): 1500 prefix info option (3), length 32 (4): 2a00:7660:5c6::/64, Flags [onlink, *auto*], valid time 7040s, pref. time 1800s unknown option (24), length 16 (2): 0x0000: 3000 0000 1b80 2a00 7660 05c6 0000 So my CPE is actually doing DHCPv6 and some nice people at Google decided that it will be better for me to be without IPv6 in that case :-(. But it also has the auto flag, so Android should be able to do SLAAC yes? My Macbook Pro currently has the following set of addresses: en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 3c:15:c2:ba:76:d4 inet6 fe80::3e15:c2ff:feba:76d4%en0 prefixlen 64 scopeid 0x4 inet 192.168.1.214 netmask 0xffffff00 broadcast 192.168.1.255 inet6 2a00:7660:5c6::3e15:c2ff:feba:76d4 prefixlen 64 autoconf inet6 2a00:7660:5c6::b5a5:5839:ca0f:267e prefixlen 64 autoconf temporary inet6 2a00:7660:5c6::899 prefixlen 64 dynamic nd6 options=1<PERFORMNUD> media: autoselect status: active To me it seems that the Macbook has one SLAAC address, one privacy extension address and one DHCPv6 managed address. In fact the CPE manufacturer is a little clever here. They gave me an easy address that I can use to access my computer ("899") while still allowing SLAAC and privacy extensions. If I want to open ports in my firewall I could do that to the "899" address. But why is my Android devices without IPv6 in this setup? Regards, Baldur
-- Enno Rey ERNW GmbH - Carl-Bosch-Str. 4 - 69115 Heidelberg - www.ernw.de Tel. +49 6221 480390 - Fax 6221 419008 - Cell +49 173 6745902 Handelsregister Mannheim: HRB 337135 Geschaeftsfuehrer: Enno Rey ======================================================= Blog: www.insinuator.net || Conference: www.troopers.de Twitter: @Enno_Insinuator =======================================================
Current thread:
- Android and DHCPv6 again Baldur Norddahl (Oct 03)
- Re: Android and DHCPv6 again Bruce Horth (Oct 06)
- Re: Android and DHCPv6 again Alejandro Acosta (Oct 06)
- Re: Android and DHCPv6 again Bruce Horth (Oct 06)
- Re: Android and DHCPv6 again Enno Rey (Oct 06)
- Re: Android and DHCPv6 again Alejandro Acosta (Oct 07)
- Re: Android and DHCPv6 again Alejandro Acosta (Oct 06)
- Re: Android and DHCPv6 again Baldur Norddahl (Oct 06)
- Re: Android and DHCPv6 again Bruce Horth (Oct 06)
- Re: Android and DHCPv6 again Ray Soucy (Oct 15)
- Re: Android and DHCPv6 again Dave Bell (Oct 15)
- RE: Android and DHCPv6 again Nicholas Warren (Oct 15)
- RE: Android and DHCPv6 again Matthew Huff (Oct 15)
- Re: Android and DHCPv6 again Sander Steffann (Oct 15)
- RE: Android and DHCPv6 again Baldur Norddahl (Oct 15)
- Re: Android and DHCPv6 again Lorenzo Colitti (Oct 15)
- Re: Android and DHCPv6 again Dave Bell (Oct 15)