vnstat 
¸®´ª½º Äֻܼ󿡼 ³¯Â¥º°·Î Æ®·¡ÇÈÀ» ¸ð´ÏÅ͸µ ÇÒ¼ö ÀÖ´Â ÅøÀÔ´Ï´Ù.
¼³Ä¡´Â yumÀ¸·Î Áö¿øµÇ¸ç ubutu´Â apt-getÀ¸·Î ¼Õ½±°Ô ¼³Ä¡ÇÒ¼ö ÀÖ½À´Ï´Ù.
¶ÇÇÑ ½Ã°£, ÀÏ, ÁÖ, ¿ùº°·Î Ãâ·ÂÀÌ °¡´ÉÇÏ¸ç µ¿½Ã¿¡ ¿©·¯°³ÀÇ ÀÌ´õ³Ý ÀÎÅÍÆäÀ̽º¸¦ ¸ð´ÏÅ͸µÀÌ °¡´ÉÇÕ´Ï´Ù.
OS : Fedoara18 x86
# yum install vnstat
# vnstat --help
 vnStat 1.11 by Teemu Toivola <tst at iki dot fi>
         -q,  --query          query database
         -h,  --hours          show hours    :: ½Ã°£º° Ãâ·Â
         -d,  --days           show days   :: ÀÏÀϵ¥ÀÌŸ Ãâ·Â
         -m,  --months         show months  :: ¿ùº°µ¥ÀÌŸ Ãâ·Â
         -w,  --weeks          show weeks   :: ÁÖ°£µ¥ÀÌŸ Ãâ·Â
         -t,  --top10          show top10   :: Æ®·¡ÇÈ »ç¿ë·® TOP Á¤·Ä
         -s,  --short          use short output
         -u,  --update         update database
         -i,  --iface          select interface (default: eth0)
         -?,  --help           short help
         -v,  --version        show version
         -tr, --traffic        calculate traffic   :: ƯÁ¤½Ã°£µ¿¾È ´©ÀûÆ®·¡ÇÈ Ãâ·Â(ÃÊ´ÜÀ§ ÀÔ·Â)
         -ru, --rateunit       swap configured rate unit
         -l,  --live           show transfer rate in real time   :: ½Ç½Ã°£ Æ®·¡ÇÈ Ãâ·Â
See also "--longhelp" for complete options list and "man vnstat".
# vnstat
No database found, nothing to do. Use --help for help.
A new database can be created with the following command:
    vnstat -u -i eth0
Replace 'eth0' with the interface that should be monitored.
The following interfaces are currently available:
    eth0 eth1 eth2 eth3 lo 
¸ð´ÏÅ͸µ °¡´ÉÇÑ ÀÌ´õ³Ý µð¹ÙÀ̽º È®ÀÎ
# vnstat --iflist
Available interfaces: eth0 eth1 eth2 lo 
eth0 ¸ð´ÏÅ͸µ  (óÀ½¿¡´Â µ¥ÀÌÅͺ£À̽º ÆÄÀÏÀÌ ¾ø¾î¼ Error ¸Þ¼¼Áö°¡ Ãâ·Â)
#  vnstat -u -i eth0 
Error: Unable to read database "/var/lib/vnstat/eth0".
Info: -> A new database has been created.
:: ¾ÆÁ÷ ÃæºÐÇÑ µ¥ÀÌÅͰ¡ ´©ÀûµÇÁö ¾Ê¾Æ¼ ³ª¿À´Â ¸Þ¼¼Áö·Î ÀÏÁ¤µ¥ÀÌŸ°¡ ½×ÀÌ°Ô µÇ¸é Ãâ·ÂµË´Ï´Ù.
# vnstat
 eth0: Not enough data available yet.
# vnstat
Database updated: Thu Oct 30 13:35:40 2014
   eth0 since 10/30/14
          rx:  599.48 MiB      tx:  11.28 MiB      total:  610.76 MiB
   monthly
                     rx      |     tx      |    total    |   avg. rate
     ------------------------+-------------+-------------+---------------
       Oct '14    599.48 MiB |   11.28 MiB |  610.76 MiB |    1.96 kbit/s
     ------------------------+-------------+-------------+---------------
     estimated       628 MiB |      11 MiB |     639 MiB |
   daily
                     rx      |     tx      |    total    |   avg. rate
     ------------------------+-------------+-------------+---------------
         today    599.48 MiB |   11.28 MiB |  610.76 MiB |  102.23 kbit/s
     ------------------------+-------------+-------------+---------------
     estimated      1.03 GiB |      19 MiB |    1.05 GiB |