> ifconfig
Bring network up
ifconfig <interface> up
Bring network up with specific IP
ifconfig eth0 172.16.25.125
Bring network up with all parameters
ifconfig eth0 172.16.25.125 netmask 255.255.255.224 broadcast 172.16.25.63
Bring network down
ifconfig <interface> down
Simulate network outrage for 500 ms
ifconfig eth0 down; usleep 500; ifconfig eth0 up
> DNS
Check currently-using DNS server
cat /etc/resolv.conf
Make simple DNS request
host yahoo.com
dig yahoo.com
nslookup yahoo.com
> IGMP Group + AWK
Complicated Log Simplification with AWK
cat /proc/net/igmp
awk -F' ' 'NF==5 {print "INT " $2} NF==4 {print "GP " $1}' /proc/net/igmp
#explanation: if row num of field = 5, show INT and the second variable
#explanation: if row num of field = 4, show GP and the first variable
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