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Discover Global Zone Name from Local Zone

 Tip courtesy of Kyle Reynolds at http://www.camelrichard.org

from the local zone, run:

arp -a | grep SP

example:

# arp -a | grep SP
bge1 zone1.domain.com 255.255.255.255 SP 00:03:ba:51:37:8e
bge0 host1.domain.com 255.255.255.255 SP 00:03:ba:51:37:8d
bge1 zone2.domain.com 255.255.255.255 SP 00:03:ba:51:37:8e
bge2 zone3.domain.com 255.255.255.255 SP 00:03:ba:51:37:8f