Benchmark with apache benchmark tool
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ab -n 99999 -c 1000 http://127.0.0.1:9687/
Port channels & scan
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cat > /dev/tcp/localhost/1234
cat < /dev/tcp/localhost/1234 | grep 1234
nc -vzt host port
Trace a process
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10
sudo strace -t -p 13262 -f -e trace=network -s 10000

strace -t -e trace=open,close,read,write df
sudo ltrace -t -p 13262

sudo strace -t $(pidof "nginx" | sed 's/\([0-9]*\)/-p \1/g') -f -e trace=network,open,close,read,write -s 10000

function straceall {
  strace $(pidof "${1}" | sed 's/\([0-9]*\)/-p \1/g')
}
Trace a network log
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ngrep -qt 'REGEX ' 'port 80'