Differences

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--- ipv6_sfr_adsl [2014/01/12 01:55] – samer
+++ ipv6_sfr_adsl [2014/01/16 17:26] (current) – [IPv6 Packet Capture] samer
@@ Line 1: / Line 1: @@
-SFR has now activated the IPv6 support on its ADSL boxes. Here are some snapshots of the configuration interface of a NeufBox 4 :
+====== IPv6 with SFR ======
+SFR has activated in august 2011 the IPv6 support on its ADSL boxes. Here are some snapshots of the configuration interface of a NeufBox 4 :
 [{{ :ipv6-sfr-box-iface-1.png?direct&400 |Figure 1. IPv6 activation on SFR box}}]
 [{{ :ipv6-sfr-box-iface-2.png?direct&400 | Figure 2. IPv6 parameters on SFR box}}]
@@ Line 35: / Line 37: @@
 2a00:1450:8007::6a 45.815 ms 44.046 ms 45.221 ms
 </code>
+===== IPv6 Packet Capture =====
+The SFR ADSL box, as a typical IPv6 router, sends unsolicited Router Advertisement messages pseudo-periodically and solicited Router Advertisement messages in response to the receipt of a Router Solicitation message. The Router Advertisement message contains the information required by hosts to determine the link prefixes, the link MTU, whether or not to use address autoconfiguration, and the duration for which addresses created through address autoconfiguration are valid and preferred. The packet capture given hereafter shows some interesting features of the IPv6 deployment by SFR:
+  - The router lifetime is set to the default 30 minute value.
+  - The prefix length is /64 (part of the /56 prefix announced on the web interface as seen in Figure 2).
+  - The valid lifetime is equal to the preferred lifetime! A typical valid lifetime value is greater than the preferred lifetime in order to enable a soft renumbering of the hosts.
+  - A recursive DNS server is given according to the recent [[http://tools.ietf.org/html/rfc6106 | RFC 6106]] (obsoleting RFC 5006).
+  - The Home Agent Flag is set and a Home Agent option is included int he RA! This indicates that the NeufBox is serving as a home agent on this link, according to [[http://tools.ietf.org/rfc/rfc6275.txt | RFC 6275]] on mobility support in IPv6.
+<code>
+No. Time Source Destination Protocol Info
+30.577228 fe80::217:33ff:fef2:XXXX ff02::1 ICMPv6 Router advertisement from 00:17:33:f2:XX:XX
+Frame 88: 150 bytes on wire (1200 bits), 150 bytes captured (1200 bits)
+Ethernet II, Src: Sfr_f2:XX:XX (00:17:33:f2:XX:XX), Dst: IPv6mcast_00:00:00:01 (33:33:00:00:00:01)
+Internet Protocol Version 6, Src: fe80::217:33ff:fef2:XXXX (fe80::217:33ff:fef2:XXXX), Dst: ff02::1 (ff02::1)
+Internet Control Message Protocol v6
+Type: 134 (Router advertisement)
+Code: 0
+Checksum: 0xe611 [correct]
+Cur hop limit: 64
+Flags: 0x20
+Router lifetime: 1800
+Reachable time: 0
+Retrans timer: 0
+ICMPv6 Option (Prefix information)
+Type: Prefix information (3)
+Length: 32
+Prefix Length: 64
+Flags: 0xe0
+Valid lifetime: 604800
+Preferred lifetime: 604800
+Reserved
+Prefix: 2a02:8420:209:7a00::
+ICMPv6 Option (Recursive DNS Server)
+Type: Recursive DNS Server (25)
+Length: 24
+Reserved
+Lifetime: 600
+Recursive DNS Servers: 2a02:8420:XXX:XXXX::1 (2a02:8420:XXX:XXXX::1)
+ICMPv6 Option (Source link-layer address)
+Type: Source link-layer address (1)
+Length: 8
+Link-layer address: 00:17:33:f2:XX:XX
+ICMPv6 Option (Advertisement Interval)
+Type: Advertisement Interval (7)
+Length: 8
+Advertisement Interval: 600000
+ICMPv6 Option (Home Agent Information)
+Type: Home Agent Information (8)
+Length: 8
+Home Agent Preference: 10
+Home Agent Lifetime: 1800
+</code>