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MRTG

First you need to install snmpd from ports

Then install MRTG from ports
cd /usr/ports/net-mgmt/mrtg
make install


Make web server dirs ready
mkdir /usr/local/www/apache22/data/stats
chown mrtg /usr/local/www/apache22/data/stats


Check your interface index
snmpwalk -v 2c -c read2user localhost IP-MIB::ipAdEntIfIndex
IP-MIB::ipAdEntIfIndex.78.47.207.147 = INTEGER: 1
IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 2

(See the 1 after the IP 78.47.207.147. This is what we want to use in the config file next)

Make a simple config file (/usr/local/etc/mrtg/mrtg.cfg) to begin with
WorkDir: /usr/local/www/apache22/data/stats
Target[confighell]: 1:read2user@localhost
MaxBytes[confighell]: 10240000
Title[confighell]: Traffic on Confighell
PageTop[confighell]: <H1>Stats for Confighell</H1>

(See the link between Target[confighell]: 1:* and the index we just found before)

Start MRTG daemon
echo mrtg_daemon_enable="YES" >> /etc/rc.conf
/usr/local/etc/rc.d/mrtg_daemon start


See also
Cacti?