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This document Setting Datalink Properties - Oracle Solaris Administration: Network Interfaces and Network Virtualization states that to enable jumbo frames the following commands have to be used:
# ipadm delete-if net0
# dladm set-linkprop -p mtu=9000 net0
This command fails in 11.2 with the error message:
dladm: warning: cannot set link property 'mtu' on net0: link busy
After that I cannot even go back to the old DHCP address as every IP address creation command reports 'operation failed'
What is the correct method to enable jumbo frames?