DHCPv6 /56 Prefix Deligation
CharlesLaCour
Newbie ✭
I have a TZ-670 currently running SonicOS 7.1.1-7040-R5387. With the 6.x version of SonicOS you were able to set a preferred prefix delegation with a prefix length. My ISP provides both a /64 and /56 prefix but without this hint with the prefix length in the preferred prefix delegation I only get the /64.
Since it is best practice to not subdivide a IPv6 /64 and I have IPv6 on multiple interfaces in different zones I would really like to get back to getting the /56 prefix.
Also along the same lines when I was able to get a /56 prefix delegation there was no easy way to assign addresses from this on more than one interface without having to include the entire /64 subnet address from the /56 delegation.
(Yes this is a reposting of a question I had from almost 2 years ago and still no one sooms to have an idea on if this is possible)
Answers
Wanted to give an update. It seems that an update is in engineering and has a Next Action : Waiting for QA validation for HF firmware.
Charles,
Saw your original post and replied to it here: https://community.sonicwall.com/technology-and-support/discussion/3686/receiving-a-56-dhcpv6-prefix-delegation
Copying my response here to lend weight to your requests.
I have a TZ-670 with SonicOS 7.1.1-7058. I am also only getting a delegation of length /64 from my ISP, and cannot find a way to request a different length like /56 or /60.
I am trying to turn on IPv6 on a Guest WLAN that has been configured as a VLAN. Since I cannot subdivide the delegated prefix any further, at the moment I only have IPv6 enabled on a single interface.
Heyyy… I just updated my firmware to SonicOS 7.1.3-7015-R6965, and there's a new field for "Send preferred delegated prefix"!
And that did the trick! I now have IPv6 running on both my private network and my guest network, each with their own /64 subnet.