I’m always forgetting linux commands that I rarely use but know I’ve executed in the past. So, this post is to give me a central location for those pesky commands, so I never have to bang my head against the keyboard again.

CentOS – I love you. You’re my new best friend as I grew quickly tired of Fedora’s yum repositories staying around about as long as I keep a pair of underwear. But what’s up with making me issue default route commands to get networking going or restarting networking after startup? Very annoying.

route add default gw eth0 [place this in /etc/rc.d/rc.local]

Mod command to track the state of connections

modprobe ip_conntrack

Mod command to load the iptables active FTP module (requires ip_conntrack command to have been executed)

modprobe ip_conntrack_ftp

Mod command to load iptables NAT module when required

modprobe iptable_nat

Mod command required for active an FTP server using NAT

modprobe ip_nat_ftp

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