I have a linux guest using hipersockets on chpid 0xED.  I am not able to
ping from this guest to other guests which are on chpid 0xEC. I used yast
to configure and my ifconfig shows the interface as active.

If the addresses you show above are correct, then the guests are on two
different unconnected network segments and should not respond unless there
is some device acting as a bridge or router between the two segments,
regardless of VLAN status. It's exactly like expecting two hosts connected
to different hubs to respond to each other -- there's got to be a path
connecting the two somewhere.

This is no different than how any other physical network segments work. A
hipersocket is a single physical  transport domain -- it's a big fast hub
that is responsible for forwarding physical frames presented to it. The next
layer up (layer 2) worries about the structure of the frame and things like
VLAN tags. If you choose to have those frames contain VLAN tags and the
hosts know to expect VLAN tags, then you get VLANs. If not, then you get one
big broadcast domain and everyone sees everything. The physical transport
doesn't care about the content of the frames, just that they checksum
correctly and get on and off the wire w/o errors.

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