ICMPv6 handling failure error

[Saxman58]

In any Wi-Fi firmware that I write with nRF Connect SDK I get this error message in my console logs:

<err> net_icmpv6: ICMPv6 handling failure (-2)

This happens in every app I've run, including all the code in your Wi-Fi Fundamentals course, samples and my own firmware.  It happens due to incoming messages from my network, even when my app is sitting idle (not sending anything).  I sometimes get 1 or 2 per second, and other times it is many seconds between these errors.

I traced it down a little and it appears to be from incoming ICMP messages that the Zephyr or Nordic firmware doesn't know how to deal with.

I am using v2.6.1 of the SDK.

Do you know what this error message means, and how to get rid of it?

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I turned on debug logging in the icmpv6.c module and it looks like ICMPv6 input that triggers the error is an ICMPv6 Redirect Message type 137:

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[00:00:06.478,851] <inf> tftp_test: Band: 5GHz

[00:00:06.478,881] <inf> tftp_test: Channel: 153

[00:00:06.478,881] <inf> tftp_test: Security: WPA2-PSK

[00:00:06.478,881] <inf> tftp_test: MFP: Optional

[00:00:06.478,912] <inf> tftp_test: RSSI: -41

[00:00:06.478,942] <inf> tftp_test: Got Wi-Fi Connection

[00:00:06.478,942] <inf> tftp_test: Waiting for Wi-Fi DHCP

[00:00:07.301,116] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Router Advertisement received type 134 code 0

[00:00:07.307,861] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Neighbor Advertisement received type 136 code 0

[00:00:07.309,082] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Neighbor Advertisement received type 136 code 0

[00:00:07.384,490] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Router Advertisement received type 134 code 0

[00:00:07.389,556] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Neighbor Advertisement received type 136 code 0

[00:00:07.390,747] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Neighbor Advertisement received type 136 code 0

[00:00:07.484,863] <inf> net_config: IPv6 address: 2601:19b:e00:50bc:f6ce:36ff:fe00:1caa

[00:00:09.841,979] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Echo Request received type 128 code 0

[00:00:09.842,071] <dbg> net_icmpv6: icmpv6_handle_echo_request: (rx_q[0]): Received Echo Request from fe80::ea9f:80ff:fee4:45ec to ff02::1

[00:00:09.842,163] <dbg> net_icmpv6: icmpv6_handle_echo_request: (rx_q[0]): Sending Echo Reply from fe80::f6ce:36ff:fe00:1caa to fe80::ea9f:80ff:fee4:45ec

[00:00:09.848,693] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Redirect Message received type 137 code 0

[00:00:09.848,724] <err> net_icmpv6: ICMPv6 handling failure (-2)

[00:00:11.491,394] <inf> net_dhcpv4: Received: 192.168.1.121

[00:00:11.491,455] <inf> net_config: IPv4 address: 192.168.1.121

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

[00:00:06.478,851] <inf> tftp_test: Band: 5GHz
[00:00:06.478,881] <inf> tftp_test: Channel: 153
[00:00:06.478,881] <inf> tftp_test: Security: WPA2-PSK
[00:00:06.478,881] <inf> tftp_test: MFP: Optional
[00:00:06.478,912] <inf> tftp_test: RSSI: -41
[00:00:06.478,942] <inf> tftp_test: Got Wi-Fi Connection
[00:00:06.478,942] <inf> tftp_test: Waiting for Wi-Fi DHCP
[00:00:07.301,116] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Router Advertisement received type 134 code 0
[00:00:07.307,861] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Neighbor Advertisement received type 136 code 0
[00:00:07.309,082] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Neighbor Advertisement received type 136 code 0
[00:00:07.384,490] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Router Advertisement received type 134 code 0
[00:00:07.389,556] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Neighbor Advertisement received type 136 code 0
[00:00:07.390,747] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Neighbor Advertisement received type 136 code 0
[00:00:07.484,863] <inf> net_config: IPv6 address: 2601:19b:e00:50bc:f6ce:36ff:fe00:1caa
[00:00:09.841,979] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Echo Request received type 128 code 0
[00:00:09.842,071] <dbg> net_icmpv6: icmpv6_handle_echo_request: (rx_q[0]): Received Echo Request from fe80::ea9f:80ff:fee4:45ec to ff02::1
[00:00:09.842,163] <dbg> net_icmpv6: icmpv6_handle_echo_request: (rx_q[0]): Sending Echo Reply from fe80::f6ce:36ff:fe00:1caa to fe80::ea9f:80ff:fee4:45ec
[00:00:09.848,693] <dbg> net_icmpv6: net_icmpv6_input: (rx_q[0]): ICMPv6 Redirect Message received type 137 code 0
[00:00:09.848,724] <err> net_icmpv6: ICMPv6 handling failure (-2)
[00:00:11.491,394] <inf> net_dhcpv4: Received: 192.168.1.121
[00:00:11.491,455] <inf> net_config: IPv4 address: 192.168.1.121
[00:00:11.491,455] <inf> net_config: Lease time: 86400 seconds
[00:00:11.491,485] <inf> net_config: Subnet: 255.255.255.0
[00:00:11.491,516] <inf> net_config: Router: 192.168.1.1
[00:00:11.491,546] <inf> tftp_test: IP address: 192.168.1.121
[00:00:11.491,729] <inf> tftp_test: Got Wi-Fi DHCP

I traced the code out a bit with the debugger, and when a redirect message comes in and icmp_call_handlers() in zephyr/subsys/net/ip/icmp.c is called, it looks through the list of handlers for different ICMP message types and doesn't find one for Redirect type 137.

Is this handler something I have to enable via a CONFIG option or something?