------- Comment From [email protected] 2016-02-05 11:40 EDT-------
We have to distinguish between the different device types supported by the qeth 
driver:
1. OSA-cards: the qeth default is layer2. The OSA-card is able to convert 
between layer2 and layer3. Thus no lack of connectivity here. Nevertheless a 
customer may want to select layer3, especially if he wants to make use of TCP 
Segmentation Offload.
2. HiperSockets: the qeth default is layer3 to allow smooth communication with 
zOS. HiperSockets LANs are either layer2 or layer3; there is no connectivity 
between a layer2 participant and a layer3 participant.
3.virtual NICs attached to a z/VM VSWITCH or GuestLAN when Linux is running as 
a z/VM guest: Here the Linux definition has to follow the layer definition of 
the VSWITCH or GuestLAN in z/VM, otherwise connectivity is broken. Up to now 
there is no automatic detection of the layer defined in z/VM.

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https://bugs.launchpad.net/bugs/1541544

Title:
  ubuntu-installer makes a contradictional statement regarding
  layer2/layer3

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