On 12/20/2013 12:30 AM, Owen DeLong wrote:
I'd like to encourage people to use prefix-hint=::/48.
The router should accept the /60 and deal with it, but it's better to have Comcast's logs show that you requested a proper full-size prefix.
I'm almost afraid to ask about the phrase "add-default-route=yes" in the dhcp-client configuration. That seems wrong on the face of it since you should be getting your routing information from RA and not DHCP.
From what I'm told "add-default-route=yes" is a hack by RouterOS developers to add a default route via the link local address you receive DHCP packets from. This will break of course if DHCP server != intended default gateway
http://forum.mikrotik.com/viewtopic.php?f=2&t=64595&hilit=IA_PD
In the case of Comcast (and anecdotally ISC DHCP) - You'll either need to wait out the the lease time (4 days) or ask Comcast to nicely clear out your /64 lease manually. Release/renew doesn't release your current DHCP lease. I was getting A /64 and /60 (/64 had a preference of 255) before Comcast removed the /64 lease manually. Is it somehow harmful to have both?
Yeah.. RouterOS doesn't install both prefixes into the IPv6 pool used for assigning prefixes to your LAN interfaces. RouterOS is able to encapsulate sniffed packets into a TZSP container and forward them to a host of your choice. I was able to get a PCAP of my DHCPv6 packets between Comcast and I. There were two Advertise packets from Comcast (/64 followed by /60) and RouterOS only replied with (1) Request for the /64