APAN 29 Sydney 10 th February, 2010
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1 IPv6 only Session APAN 29 Sydney 10 th February, 2010
2 Where we are
3 A Little closer Dual 10 Gbps circuits All IPv4/IPv6 dual stack 3
4 IPv6 Deployment We are used to a IPv4/IPv6 dual stack environment: Things seem to work Occasional timeouts t and delays but these can be tolerated t Mail, web services, voice and other applications work But what is really ygoing gon? What really does work and what doesn t? One way to find out is to experiment!
5 Why do providers not implement IPv6? It could cause havoc! The internet has become central to many peoples businesses Applications may fail creating timeouts or loss of service IPv6 needs to be carefully yplanned and implemented. Technical knowledge in the area of IPv6 implementation is still low in the internet support industry Courtesy of Wikipedia
6 The only IPv6 environment Has been done before at IETF/NANOG/RIPE/ APRICOT Why do it again? To learn what it is like and understand and resolve issues
7 Hardware/Software Hardware Two eepcs running Fedora Cisco 881G router running IOS T1 A Wireless Access Point Software IOS T1 Fedora Core 12 BIND TOTD rpm (available from ISC DHCP Server 4.1.0p1 does both IPv4 and IPv6 albeit in separate instances See for Building an IPv6 router with GNU/Linux
8 The Network Three Wireless SSIDs Dual stack IPv4/IPv6 APAN IPv6 only apan-v6 IPv6 with some IPv4 support apan-v6-xp Why is this necessary? Windows XP does not does not resolve names using IPv6 transport Mac OS X does not support DHCPv6 to allow DNS resolver information to be passed to the machine
9 The APAN SSID On the APAN SSID all necessary network information is configured by using DHCP and IPv6 autoconfiguration Dual stack BUT IPv4 based Dual stack BUT IPv4 based DNS resolution
10 apan-v6 SSID On the apan-v6 SSID all necessary network information is configured by using IPv6 stateless address autoconfiguration (SAA) and DHCPv6 However Mac OS X users will have to enter the address of the DNS resolver manually in System Preferences, Network, Airport, Advanced, DNS. The DNS resolver address is The DNS resolver address is 2001:388:B000:1::2
11 apan-v6-xp SSID Here, to support WinXP, a private non-routed IPv4 space is created with IPv4 private addresses given out by DHCP. This includes the address of the DNS resolver This local DNS server forwards DNS queries via IPv6 to This local DNS server forwards DNS queries via IPv6 to a DNS server. The rest of the configuration is done by IPv6 SAA
12 apan-ipv6-xp dhcpd.confconf option domain-name "v6-xp.apan2010.aarnet.edu.au"; default-lease-time lease time 600; max-lease-time 7200; #authoritative; subnet netmask { option domain-name-servers ; option broadcast-address ; pool { range ; } }
13 DHCP6 done on the router ipv6 dhcp pool dual-stack dns-server server 2001:388:1:3001::2 domain-name apan2010.aarnet.edu.au! ipv6 dhcp pool v6 dns-server 2001:388:B000:1::2 domain-name v6.apan2010.aarnet.edu.au! ipv6 dhcp pool v6-xp dns-server 2001:388:B000:2::2 domain-name name v6-xp.apan2010.aarnet.edu.au aarnet edu au!
14 On the plus side mirror.aarnet.edu.au edu au But querying many search results will start breaking works! Better results this year than last year!
15 On the negative side Any service configured by an IPv4 IP address will not work! URLs which have embedded IPv4 only names will be slow to load MX records that do not have appropriate AAAA records will be unable to resolve the mail host
16 Still on the negative side Content caches are often IPv4 only Akamai Much content is still only delivered over IPv4 Even But ipv6.internet2.edu works
17 NAT-PT Provides IPv4 connectivity for IPv6 only networks Relies on a pool of IPv4 addreses for use by IPv6 clients Works by a hack inserting IPv4 addresses into a NATTED IPv6 address Works in collaboration with totd (the trick or treat daemon) which forwards DNS queries and presents IPv4 only addresses as hacked IPv6 addresses. The NAT-PT daemon knows the hacks and goes get the pages using the address from the IPv4 NAT pool
18 NAT-PT NAT-PT is cpu intensive could this scale? Totd is a replacement for running a local named daemon. Easy to configure, but if not running NAT-PT will cause timeoutst Totd.conf forwarder 2001:388:1:3001::2 port 53 prefix 2001:388:B000:: port 53 pidfile /var/run/totd.pid
19 Check out Information about the IPv6 only hours at NANOG/ARIN/APRICOT/IETF/RIPE etc meetings
20 Thank You
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