Semi-hack: for dohosts(), if the protocol for a link for which this host
is a member is 'ipv4' then we report the control net IP rather than the (non-existent in this case) experimental net IP. ipv4 protocol is only used in PELAB to group planetlab nodes into a LAN so that link tracing can be performed. Now these nodes in this LAN will be able to name each other as "planet-1", etc.
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