Public bug reported:

Setting MTU in the "Wired" tab of the network manager UI does nothing if IPv4 
is set to disabled, eg in IPv6-only environments.
Setting it to 9000 and bringing the interface up its still stuck at 1500, both 
global MTU and protocol specific MTU.

Enabling IPv4 with any bogus address makes configured MTU work.

Tested on Quantal, network manager 0.9.6.0-0ubuntu7
Status in Precise is unknown but its likely a problem there too.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1061304

Title:
  Configured ethernet MTU not set with IPv4 disabled

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