things i forget

1. To change system date and time on linux
date -s "04/20/2010 14:22:00"

2. enable logging on Cisco firewall
logging on
logging timestamp
logging monitor debugging
logging trap informational
logging history critical
logging facility 23
logging device-id ipaddress inside
logging host inside 10.50.8.112

3. MRTG
mkdir /var/www/html/mrtg/devicename
/usr/bin/cfgmaker --global WorkDir:/var/www/html/mrtg/devicename/ --output /etc/mrtg/devicename.cfg  snmpstring@devicename
indexmaker --output=/var/www/html/mrtg/devicename/index.html /etc/mrtg/devicename.cfg
env LANG=C /usr/bin/mrtg /etc/mrtg/devicename.cfg
- crontab entry
0-59/5 * * * * env LANG=C /usr/bin/mrtg /etc/mrtg/devicename.cfg

4. How to view .pcap files
tcpdump -ttttnnr tcp_dump.pcap