From: Jim Westfall <redacted>
Date: Sun, 14 Jan 2018 04:18:49 -0800
This used to be the previous behavior in older kernels but became broken in
a263b3093641f (ipv4: Make neigh lookups directly in output packet path)
and then later removed because it was broken in 0bb4087cbec0 (ipv4: Fix neigh
lookup keying over loopback/point-to-point devices)
Not having this results in there being an arp entry for every remote ip
address that the device talks to. Given a fairly active device it can
cause the arp table to become huge and/or having to add/purge large number
of entires to keep within table size thresholds.
...
v2:
- fixes coding style issues
Series applied and queued up for -stable, thank you.