https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240969
Bug ID: 240969
Summary: [netinet6] neighbour reachability detection broken
when using multiple FIB
Product: Base System
Version: 12.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
If you define multiple FIB and set "net.add_addr_allfibs=0", ND reachability
packets are sent via wrong interface, containing wrong data.
Effectively:
* reachability detection only works in FIB 0
* neighbour routers/firewalls may barf about strange ND packets for other
FIBs (this is what happens to me)
Still, network connectivity recovers automatically as standard ND multicasts
are sent out automatically after reachability detection fails.
After some investigation, I found the source of the problem: review D1998
introduced FIB-aware nd6_ns_output_fib() and a legacy wrapper nd6_ns_output()
passing RT_DEFAULT_FIB unconditionally. So, all calls to nd6_ns_output() must
be enhanced by FIB and replaced by calls to nd6_ns_output_fib().
As nd6_ns_output() is enclosed by "#ifndef BURN_BRIDGES", this seems to be the
original intention, but work has never been finished.
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