scripts: Add tap.sh

This is the script I used to setup a tap device for seastar.
whl739 · Nov 5, 2014 · 534d401 · 534d401
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+### Set up a tap device for seastar
+tap=tap0
+bridge=virbr0
+user=`whoami`
+sudo tunctl -d $tap
+sudo ip tuntap add mode tap dev $tap user $user one_queue vnet_hdr
+sudo ifconfig $tap up
+sudo brctl addif $bridge $tap
+sudo brctl stp $bridge off
+sudo modprobe vhost-net
+sudo chown $user.$user /dev/vhost-net
+sudo brctl show $bridge
+sudo ifconfig $bridge