PetteriAimonen opened a new pull request, #10813:
URL: https://github.com/apache/nuttx/pull/10813
## Summary
Allows setting the advertised route lifetime, and also to set it to 0 for
advertising only the prefix.
From RFC4861:
> A router might want to send Router Advertisements without advertising
itself as a default router. For instance, a router might advertise
prefixes for stateless address autoconfiguration while not wishing to
forward packets. Such a router sets the Router Lifetime field in
outgoing advertisements to zero.
## Impact
Default setting is the same 1800 as previously hardcoded value.
## Testing
Tested on custom STM32F4 target communicating with Linux system.
With default settings NuttX appears as a default router in `ip -6 route`
output.
By setting `CONFIG_NET_ICMPv6_ROUTER_LIFETIME=0` only the advertised prefix
appears.
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