скорость соединения

ifstat

iftop

iptraf

nload

Без установки доп. программ:
$ if_speed.sh ppp0
RX = 205020 B/s          TX = 3168 B/s


$ cat if_speed.sh

#!/bin/sh

# first option may be an interface name
IF=$1

#eth0 is a default if interface not specified
IF=${IF:=eth0}

     AWK=/usr/bin/awk
IFCONFIG=/sbin/ifconfig

SLEEP=5

first=( `$IFCONFIG $IF | $AWK '/RX bytes/ { split($2,a,":"); \
                          split($6,b,":");                   \
                          print a[2], b[2]}'` )

sleep $SLEEP

$IFCONFIG $IF | $AWK -v p=$SLEEP -v r=${first[0]} -v t=${first[1]} '/RX bytes/ \
                { split($2,a,":"); split($6,b,":"); \
                print "RX = "(a[2]-r)/p" B/s \t TX = "(b[2]-t)/p" B/s"}'