By using a DynDNS IPv6 client, I can just setup the IPv6 hostnames and forget about it as long as my IPv6 gateway router supports the DynDNS IPv6 client. OTOH, the DIR655 is a new router, and the IPv6 DDNS update is a relatively new feature for both D-Link and DynDNS, so I really don't know yet how reliable that process is.
C:\>dig ipv6.dcs-net.net AAAA
; <<>> DiG 9.9.2 <<>> ipv6.dcs-net.net AAAA
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31371
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;ipv6.dcs-net.net. IN AAAA
;; ANSWER SECTION:
ipv6.dcs-net.net. 3601 IN CNAME ipv6-webhost.dyndns-ip.com.
ipv6-webhost.dyndns-ip.com. 60 IN AAAA 2601:5:c80:91:e291:f5ff:fe95:a879
;; Query time: 156 msec
;; SERVER: 192.168.9.2#53(192.168.9.2)
;; WHEN: Sat Dec 08 17:37:55 2012
;; MSG SIZE rcvd: 113
C:\>dig ipv6.dcsenterprises.net AAAA
; <<>> DiG 9.9.2 <<>> ipv6.dcsenterprises.net AAAA
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42201
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;ipv6.dcsenterprises.net. IN AAAA
;; ANSWER SECTION:
ipv6.dcsenterprises.net. 1800 IN CNAME ipv6-dcs-srv.dyndns-ip.com.
ipv6-dcs-srv.dyndns-ip.com. 60 IN AAAA 2601:5:c80:91:e291:f5ff:fe95:beac
;; Query time: 140 msec
;; SERVER: 192.168.9.2#53(192.168.9.2)
;; WHEN: Sat Dec 08 17:38:11 2012
;; MSG SIZE rcvd: 120
On your new MetroEthernet derived service, you do get static IP addresses, so set it and forget about it is indeed possible. But not all of us can justify that expense, and that service is available in only a few very select locations.