I'm seeing a behavior which I suspect is another manifestation of bug
#783986.  ifupdown also ignores mtu lines for inet6 stanzas:

iface eth0 inet6 manual
        mtu 9000

Results in eth0 having a MTU of 1500, not the specified 9000.  I'm
suspecting ifupdown was written to ignore certain portions of inet6
stanzas on the basis they should duplicate inet stanzas.  This is okay
until there is no inet stanza.

Really looking at the present situation I wonder whether there is still
any real need for "inet6" stanzas.  For address and gateway you can
distinguish based on whether periods or colons are used, as long as
netmask is specified via <addr>/<mask>.  Most of the remainder is simply
duplicated between "inet" and "inet6".


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