Hi Everyone,
I recently moved from Openreach/BT to a friends ISP running on the FullFibre network, specifically on what used to be the Digital Infrastructure (therefore GPON, not XGS-PON) network. It is his very first connection live on the altnet.
The ONT is an Adtran SDX611, and as far as we can tell it's terminated on an Adtran TA5000 OLT.
Initially we set things up as IPoE/DHCP with IPv4 and IPv6 active. Everything seemed fine and I started using the connection, however we quickly spotted that we were seeing IPv6 loss on the connection, and I was getting occasional short delays when loading some sites. TBB graphs showed constant loss of 3-7% or so, all day, all night. Only on IPv6, zero loss on IPv4. This loss was visible directly from his BNG to my router. Loss was observed in both directions, with them getting lost while passing over the altnet network.
A TBB graph pointed at this BNG saw zero loss on IPv4 or IPv6.
We tried several routers (TP-Link, Technicolour, Mikrotik, even a pure linux machine) but none of them changed the behaviour. This loss was particularly visible on very small ICMPv6 packets, but was visible at lower levels on all packet sizes as far as we could see. TBB use a Firebrick to run their BQM service, my new ISP has three different Firebricks running monitoring things, all four graphs showed the loss.
As an experiment we then switched to PPPoE to his same BNG, this resulted in absolutely zero loss on IPv4 or IPv6. Interesting, but given speeds, avoiding PPPoE was preferable.
He then had the datacentre switch the uplink from FullFibre to another piece of equipment in his rack for him to try terminating the connection to me on that, just to rule out any issue with his BNG. Moving to an entirely different vendor.
This made no difference, PPPoE still saw zero loss, IPoE/DHCP had loss, again only on v6. I'm running PPPoE but as I'm terminating the connection on my Mikrotik router we're also able to set and IP outside the PPP and we still see IPv6 loss over that, while within the PPPoE session we see no loss.
Is
anyone else on FullFibre-based conneciton (ideally in a former Digital Infrastructure GPON area, to match what I have), is using IPoE/DHCP (NOT PPPoE!) and has native IPv6 with a clean TBB graph? I'd really like to know as given we've changed everything both ends of the connection, surely the loss must be within the FullFIbre equipment so I'm not the only person with it?
For reference mine looks like this:
Ping outside PPPoE vs
Ping inside PPPoE
Note, the return path for the 'outside PPP' ping is actually back inside PPPoE so the loss is reduced vs what we saw with pure IPoE/DHCP, but very clearly still there.
Would appreciate anyone able to see if they are getting the same behaviour! I don't know what other ISPs use IPoE on their network other than BeFibre, but they also don't seem to supply IPv6 so maybe the loss is there but we can't see it!
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summat
