For future reference, here is the script I generated to provide a MAC address for a given carp interface. Much thanks to Stuart Henderson in answering my original question on this topic. This is no rocket science, but it might save a few people 2 minutes in the future.
-Kevin #!/usr/bin/perl # # This script takes a single carp interface name as an argument, # collects the vhid from ifconfig, and then provides the appropriate # MAC address for that interface. # if ( $#ARGV == 0 ) { if ($ARGV[0] =~ /carp[0-9]+/) { if (`ifconfig $ARGV[0]` =~ /.*?vhid\ ([0-9]+).*/) { printf "00:00:5e:00:01:%02x\n",$1; } } else { print "Interface \"$ARGV[0]\" is invalid, gen_carp_mac.pl only accepts carp interface names\n"; exit; } } else { print "Usage: gen_carp_mac.pl <interface>\nThis program requires a single carp interface name as an argument.\n"; exit; }