為了在 bridge mode底下抓取網路流量給 mrtg，但值一直不是該怎麼配
#!/bin/bash
# fixed 95/01/18
cnum=10
lengthIn=`tcpdump -v -n -c $cnum dst $1 -i eth0 | awk '{print $15 $16}' | sed -e 's/length://' -e 's/)//'`
lengthOut=`tcpdump -v -n -c $cnum src $1 -i eth0 | awk '{print $15 $16}' | sed -e 's/length://' -e 's/)//'`
#echo ""
#echo "### In ###"
#echo $lengthIn
#echo ""
set — $lengthIn
#echo first=$1 second=$2 third=$3
#echo ""
#amInbytes=`expr $1 + $2 + $3 + $4 + $5 + $6 + $7 + $8 + $9 + $10`
amInbytes=`expr $1 + $2 + $3 + $4 + $5 + $6 + $7 + $8 + $9 + $10 + $11 + $12 + $13 + $14 + $15 + $16 + $17 + $18 + $19 + $20`
amIn=`expr $amInbytes / 1000`
echo amountIn=$amIn
#echo ""
#echo "### Out ###"
#echo $lengthOut
#echo ""
set — $lengthOut
#echo first=$1 second=$2 third=$3
#echo ""
#amOutbytes=`expr $1 + $2 + $3 + $4 + $5 + $6 + $7 + $8 + $9 + $10`
amOutbytes=`expr $1 + $2 + $3 + $4 + $5 + $6 + $7 + $8 + $9 + $10 + $11 + $12 + $13 + $14 + $15 + $16 + $17 + $18 + $19 + $20`
amOut=`expr $amOutbytes / 1000`
echo amountOut=$amOut
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