> In the original bug where one is comparing ip output of MTU; is there
something *not* working ?

in that original bug, the user is trying to set up ipv6 tunneling:

"This scenario is quiet common when using tunnels (e.g. Sixxs) to provide IPv6
connectivity. My IPv6 MTU needs to be 20 bytes smaller than may IPv4 MTU
because of the tunnel's overhead."

> Or did we just observe that the bond interface isn't the same MTU? Can we 
> confirm that without
> the bond interface itself set to MTU 9202 that we don't see the correct jumbo 
> frames over ipv6?

this isn't bonding-specific, the example from bug 1609861 just happens
to use bonding.  But an regular interface configured with a "inet6"
section mtu of e.g. 9000 and no "inet" section (or an "inet" section but
no mtu in it) will not correctly set the device mtu to 9000.

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https://bugs.launchpad.net/bugs/1609367

Title:
  ifupdown does not set ipv6-only large mtu

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