The standard way to detect that bonding is ok, is to do lacp.
There are other valid cases where two interfaces on the same network are ok but 802.3ad let boths sides no you are bonded, and is specified to allow for auto-configuration of bonds.
There are other games you can play but you should start with 802.3ad.
Posted Sep 19, 2012 4:12 UTC (Wed) by zlynx (subscriber, #2285)
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I don't want a bond for sharing bandwidth, so it does not matter that the other side knows about it. I want the bond for fail-over only so that when the Ethernet disconnects it falls back to wireless. There's a mode for that in Linux.