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