[Bug 292319] [network: fibs] traffic comes from the wrong fib in some cases.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292319

Pouria Mousavizadeh Tehrani <pouria@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
                 CC|                            |pouria@freebsd.org
         Resolution|---                         |Works As Intended

--- Comment #1 from Pouria Mousavizadeh Tehrani <pouria@freebsd.org> ---
Hi Willian,

Thank you for your report.
IMHO, this is expected behaviour.
You upstream router (172.24.17.1) is not aware that you're using a separate
FIB.
As defined in RFC792:
The gateway sends a redirect message to a host ... the host identified by the
internet source address of the datagram are on the same network, a redirect
message is sent to the host.

Therefore, your host receives an ICMP redirect message indicating that your
host is on the same link as the router. FreeBSD will create a dynamic route
with an expiration time in its routing table (FIB 1 in your case) and directly
forward traffic as expected.

As you have already found out, you can avoid this scenario by setting
icmp_drop_redirect="YES".

Please reopen this issue if that is not the case.

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