taps in rc.config

[Randy Bush]

i want to run a whole bunch of dynamips virtualized ciscos inside a fbsd
8.x server.  i want the virtual routers to have some interfaces which
are externally visible.  

so i think i do something like

    ifconfig tap0 147.28.224.41/30
    ifconfig tap1 147.28.224.45/30
    ifconfig tap2 147.28.224.49/30
    ifconfig tap3 147.28.224.53/30
    ifconfig tap4 147.28.224.57/30
    ifconfig tap5 147.28.224.61/30
    ifconfig tap6 147.28.224.65/30
    ifconfig tap7 147.28.224.69/30
    ifconfig tap8 147.28.224.73/30
    ifconfig tap9 147.28.224.77/30

and then bridge them on to the external ether.  but i am a bit
confuddled.  can someone tell me how to do from command line, and then
also how to code in /etc/rc.conf?

thanks.

randy
clueless in tokyo