O programa ifstat é ótimo para ver de forma online como estão as interfaces de rede no que diz respeito ao download e upload de dados.
Para instalá-lo use:
# apt-get install ifstat
Seu uso é simples. Basta digitar o comando passando "-a" como parâmetro para mostrar os dados de todas as interfaces.
$ ifstat -a
lo eth0 eth1
KB/s in KB/s out KB/s in KB/s out KB/s in KB/s out
927.83 927.83 2808.16 7165.52 7147.57 2213.80
1462.99 1462.99 2871.27 5219.12 5217.93 2355.21
1552.99 1552.99 2221.81 7943.48 7928.80 1651.37
1797.99 1797.99 1875.98 4431.78 4461.20 1312.80
1785.94 1785.94 2260.76 6935.33 6837.54 1716.26
1556.27 1556.27 2305.75 10295.63 10265.04 1749.11
1218.54 1218.54 2495.21 8426.51 8388.47 1907.51
1412.53 1412.53 2203.23 3878.96 3805.40 1606.59
1724.88 1724.88 2108.79 3065.37 3049.91 1584.52
1904.21 1904.21 2035.68 4292.38 3783.56 1505.63
2534.54 2534.54 2225.66 5805.82 5645.50 1673.03
1496.73 1496.73 2059.95 6998.29 6922.70 1491.80
2038.61 2038.61 2121.71 4985.27 4879.74 1620.98
2285.01 2285.01 2503.31 7688.86 7701.65 1926.83
2753.78 2753.78 2347.53 6013.30 5902.92 1760.96
2729.05 2729.05 2114.76 10035.34 10072.93 1612.32
2443.32 2443.32 2295.35 9228.05 9239.88 1751.52
3334.26 3334.26 2031.68 3971.51 3974.47 1528.43
1907.00 1907.00 2495.21 7763.01 7460.65 1997.91
1942.95 1942.95 2519.77 6173.28 6276.35 2029.58
1846.70 1846.70 2911.25 3885.63 3634.37 2350.52
1633.02 1633.02 2722.14 7003.83 5225.66 2079.18
^C
lo eth0 eth1
KB/s in KB/s out KB/s in KB/s out KB/s in KB/s out
927.83 927.83 2808.16 7165.52 7147.57 2213.80
1462.99 1462.99 2871.27 5219.12 5217.93 2355.21
1552.99 1552.99 2221.81 7943.48 7928.80 1651.37
1797.99 1797.99 1875.98 4431.78 4461.20 1312.80
1785.94 1785.94 2260.76 6935.33 6837.54 1716.26
1556.27 1556.27 2305.75 10295.63 10265.04 1749.11
1218.54 1218.54 2495.21 8426.51 8388.47 1907.51
1412.53 1412.53 2203.23 3878.96 3805.40 1606.59
1724.88 1724.88 2108.79 3065.37 3049.91 1584.52
1904.21 1904.21 2035.68 4292.38 3783.56 1505.63
2534.54 2534.54 2225.66 5805.82 5645.50 1673.03
1496.73 1496.73 2059.95 6998.29 6922.70 1491.80
2038.61 2038.61 2121.71 4985.27 4879.74 1620.98
2285.01 2285.01 2503.31 7688.86 7701.65 1926.83
2753.78 2753.78 2347.53 6013.30 5902.92 1760.96
2729.05 2729.05 2114.76 10035.34 10072.93 1612.32
2443.32 2443.32 2295.35 9228.05 9239.88 1751.52
3334.26 3334.26 2031.68 3971.51 3974.47 1528.43
1907.00 1907.00 2495.21 7763.01 7460.65 1997.91
1942.95 1942.95 2519.77 6173.28 6276.35 2029.58
1846.70 1846.70 2911.25 3885.63 3634.37 2350.52
1633.02 1633.02 2722.14 7003.83 5225.66 2079.18
^C
Os dados são mostrados as cada segundo e os valores estão em Kbytes. Para outras opções você pode consultar a página de manual digitando:
$ man ifstat
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