NAFO provides a failover feature for NICs on Solaris servers. It's part of the Sun Cluster software. The main commands are:

   pnmstat -l - check the status of NAFO groups
   pnmset -c nafo2 -o switch qfe2 - will switch the active network adapter in NAFO group nafo2 to be qfe2.
   pnmset -c nafo3 -o create qfe5 qfe8 - will create a NAFO group nafo3 consisting of interfaces qfe5 and qfe8.
   pnmset -c nafo4 -o remove qfe6 - will remove interface qfe6 from NAFO group nafo4

An alternative to NAFO is Solaris_IP_Multi_Pathing.

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