At my home I am using both a Huricane Electric IPv6 Tunnel and DynDNS with my dynamic PPPoE DSL. While static addresses are available, the additional price isn’t worthwhile for my current uses. I found that Hunicane Electric now has a dynamic interfaces that works similar to DynDNS. I was able to get the following configs to set up DynDNS and a dynamic HE Tunnel.
ip ddns update method DynDNS HTTP add http://USERNAME:PASSWORD4@<s>/nic/update?system=dyndns&hostname=DNSNAME&myip=<a> interval maximum 10 0 0 0 ! ip ddns update method Tunnel HTTP add http://ipv4.tunnelbroker.net/ipv4_end.php?ipv4b=AUTO&pass=PASSWORD&user_id=USERID&tunnel_id=TUNNEL-NUM interval maximum 10 0 0 0 ! ! interface Tunnel0 description Hurricane Electric IPv6 Tunnel Broker no ip address ipv6 address 2001:DB8::2/64 ipv6 enable tunnel source Dialer0 tunnel destination HE-ENDPOINT tunnel mode ipv6ip ! ! interface Dialer0 ip ddns update hostname HOSTNAME ip ddns update DynDNS host members.dyndns.org ip ddns update Tunnel ip address negotiated ip mtu 1492 ip nat outside encapsulation ppp ip tcp adjust-mss 1460 load-interval 30 dialer pool 1 dialer-group 1 ppp authentication XXXXXXXXXXXX ppp chap hostname XXXXXXXXXXXX ppp chap password XXXXXXXXXXXX !