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3885 posts

Uber Geek


# 239951 13-Aug-2018 00:20

My connection dropped for about 5min around midnight. And when it came back online, IPv6 started working.

Background- I use an Edge router lite. Have done so for practically the whole time I have had fibre 4+ years, originally with Snap, then 2deg. Around 6 months or so ago, I figured it is about time I got IPv6 working. But I couldn't get it working, and gave up. Assuming that I had made a configuration mistake with the Edge router.

Happy as this means that I actually did get my configuration correct. Although now I need to test that I have some working IPv6 firewall rules in place.

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540 posts

Ultimate Geek


  # 2072870 13-Aug-2018 17:09
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Hi All,


As part of our upgrades to 100gb backhaul across the network, the addition of new 100gb line cards etc. we've been testing new versions of Junos for our Juniper MX platform to take advantage of these new features and functionality. Now that this testing is complete, we are working through upgrading firmware on our PE/P nodes across the network. There are a bunch of them so it will take some time, we've completed a number already and we have a schedule we are working through. There is some change in behavior introduced in the new version of Junos which enables us to work around some of the issues we've previously seen before, there is also planned upgrade by Chorus which needs to be done due for a bug on the ONT's - This is scheduled for upgrade beginning mid this month (any time now) Great we've managed to work around some of the IPv6 issues :-)





Update - I've had some of our team investigate this further today, we've made a slight change to the way we handle IPV6 allocations as detailed in the last paragraph.


At 2degrees we use DHCPv6 prefix delegation for static IPv6 subscribers using our RADIUS server to inform the BNG of the delegated prefix to use in its DHCPv6 advertisement. 


The older version of BNG code required that subscriber static IPv6 be setup in a certain way to function, where the delegated and framed IPv6 attributes from RADIUS where set to the same value.  This was required to force the BNG to install the subscriber IPv6 delegation into the BNGs forwarding table.  As was mentioned by @GregB, this did mean that we used some of the static range for the point-to-point link between the BNG and CPE; this implementation is no longer supported on the newer version of code from Juniper and we’ve made changes to our RADIUS policy to support the new code.


The workaround implemented previously to support BNGs running both versions of code was to still advertise both attributes but change the values sent in the reply to the BNG.  This is supported on BNGs running newer code but wasn’t necessary for subscriber IPv6 to function, where only the delegated attributed is needed.  Looking at our workaround again in the lab and on production it seems that it’s not consistent (Depending on CPE/firmware etc.) what delegation the CPE uses in its DHCPv6 lease.  To resolve this specific issue we’ve applied some changes to further define the radius attributes per software version on the BNG, so those BNGs running an older release of code will revert to the old way, and BNGs running newer versions of code will only use the delegated IPv6 prefix attribute.



nickmack GZ Signature

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