IPv6 Routing Problem

[Chris Pearson]

I upgraded my LAN to IPv6 and have run into a problem with OTBR. The BR does not appear to be advertising itself as a router on the LAN. I don't see anything regarding this in the documentation, so I'm not certain what I'm missing here.

A few quick notes:

• I'm running the OTBR from the OpenThread site on a Raspberry Pi, using a nRF52840 with firmware built from the OpenThread nrf528xx tree.
• The OpenThread network was formed using the web GUI form tool. 
• The OTBR and the destination machine can ping each other through their IPv6 addresses. 
• None of the devices are connected through Wi-Fi, so there shouldn't be any IPv6 Router Advertisement Guard issues.
• Checking the prefix settings on the OTBR shows fd11:22:0:0::/64 paros med 9400

Using tcpdump, I've traced a ping from the OpenThread network, through the OTBR, to the destination machine. The tcpdump from the destination machine shows the destination machine sending the reply to the fd11:22:: OpenThread address, but there is no sign of that reply in the OTBR's tcpdump logs. 

Checking the destination machine's routing table shows no sign of the fd11:22:: OpenThread network. However, if I manually insert a route to the  fd11:22:: network, via the OTBR, the pings will now work.

So, in summary, I seem to be missing something regarding having the OTBR advertise itself as a router.

Any thoughts?  Thanks!

[Jonathan Hui]

Have you tried following the OpenThread Border Router codelab? The codelab should demonstrate how to set up an OpenThread border router that automatically configures IPv6 prefixes and routes to allow for connectivity between Thread and an adjacent Wi-Fi / Ethernet link.

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Jonathan Hui

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[Chris Pearson]

If I'd seen the full title "Bidirectional IPv6 Connectivity and DNS-Based Service Discovery" elsewhere, instead of the "OpenThread Border Router" title, I definitely would have gone through it! 🙂

Thanks! That solved the problem. It seems that dhcpcd was getting in the way.