![]() ![]() ![]() That said, some RTDs are a lot higher, and there is some packet loss. fe80:: ping statistics -ġ00 packets transmitted, 100 packets received, 0% packet loss The collectd statistics show ping responses from the ISPs concentrator's link-local IP address to (a) be more stable, (b) consistently low-delay and (c) far lower drop rate. Meanwhile, the IPv6 stability on 21.02.2 seems better. Well, I tried that, and got a lot of messages in the log complaining about the configuration. If you can suggest some diagnostics to demonstrate it is a firewall problem, or rule it out, I'd be grateful. *Well, I don't see how the firewall would cause the behaviour I'm seeing. I'm not ruling out that OpenWrt implements Neighbor Discovery incorrectly, but I would have expected a lot of bug notifications if that were the case.The Huawei appears to be ignoring Router Solicitations - details in previous post: OpenWrt IPv6 issue? It is galling that IPv4 comes up as soon as the router is booted, and IPv6 takes a variable amount of time, from minutes to hours. I have taken comprehensive logs using tcpdump and wireshark, and can see that the Neighbor Discovery is not working properly between the OpenWrt router and the upstream Huawei router operated by the ISP. IPv6 protocol does come up eventually, it just takes a long time. ![]() It's a little irritating that a router (which would know if the destination is unreachable) doesn't return that status when you try to ping outside directly attached networks. OK, thanks for the explanation of the precise meanings of 'Time Exceeded' and 'Destination Unreachable'.
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