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prlzx
(experienced) Thu 27-Nov-25 16:31:32

Suspected IPv6 Peering/Routing issue between Zen and IDNet

[link to this post]

I have a Zen FTTC connection at home and an IDNet FTTP connection at the office both native dual-stack.

Since this morning they have been unable to reach each other (but are reachable on v4).
Both ends still have working connections and can traceroute / mtr to www.example.net and other dual-stack servers.

However now traces from each of Zen and IDNet towards each other stop with timeouts while still within respective own ISP networks - they get past the first external router so it's not a LAN router/firewall (and there have been no changes to either this month).

prlzx on Zen: FTTC (VDSL) at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)

Edited by prlzx (Thu 27-Nov-25 16:31:55)

prlzx
(experienced) Sat 29-Nov-25 15:08:58

Re: Suspected IPv6 Peering/Routing issue between Zen and IDN

[re: prlzx] [link to this post]

Working again although intermediate hops no longer reply which is a change:

Text

Host                                                                        Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 2a02:8010:675a:0:de39:6fff:fehh:hhhh                                      0.0%    10    0.7   0.7   0.6   0.8   0.0 2. 2a02:8010::155                                                            0.0%    10    9.2  17.2   9.1  33.4   8.0
 3. (waiting for reply) 4. (waiting for reply)
 5. (waiting for reply) 6. 2a02:390:feed:ssss:hhhh:hhhh:hhhh:hhhh                                    0.0%     9   17.7  18.3  17.7  19.1   0.5
 7. 2a02:390:ssss:d:208:a2ff:fehh:hhhh                                        0.0%     9   18.8  19.1  18.2  19.9   0.5

prlzx on Zen: FTTC (VDSL) at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)

jpm
(fountain of knowledge) Sun 30-Nov-25 21:15:28

Re: Suspected IPv6 Peering/Routing issue between Zen and IDN

[re: prlzx] [link to this post]

I think I had this, was trying to connect to a firewall that only has the management interface exposed on IPv6 and it wasn't working.

This was BT/EE to IDNet so I guess IDNet was the issue.

candlerb
(knowledge is power) Mon 01-Dec-25 10:55:24

Re: Suspected IPv6 Peering/Routing issue between Zen and IDN

[re: jpm] [link to this post]

IPv6 - the global out-of-band management network smile

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