[LARTC] What does flowid:1 mean here?

[CcM]

Hi,

     I got the following lines from 'Linux Advanced Routing & Traffice Control HOWTO' and got confused!

 

     iptables -A PREROUTING -i $INDEV -t mangle -p tcp --syn \
     -j MARK --set-mark 1

     tc qdisc add dev $INDEV handle ffff: ingress
     tc filter add dev $INDEV parent ffff: protocol ip prio 50 handle 1 fw \
     police rate 1kbit burst 40 mtu 9k drop flowid :1

 

     Does the second command mean that the filter will police the traffic of syn to 1kbit by dropping? What does flowid:1 mean here?

 

Thanks in advance.

CcM

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