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Connection check to VPN or network #

Description #

Simple way that can be done in most Linux OS (ICMP)

Uses nping (from nmap) for TCP Ping

To know if you have:

  • been blocked by WAF, IPS, NAC
  • been disconnected from your VPN (i.e. ovpn)
  • oversaturated your connection (Lessen your threads)
  • TCP Ping for second verification or if host does not respond to ICMP

Make sure to change:

  • $hostORdomain
  • $destPort

Bash #

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cd ~
echo 'alias con_check_icmp="ping $hostORdomain |cut -d \"=\" -f 2,4"' >> .bashrc
echo "alias con_check_tcp=\"sudo nping --tcp --delay 1s -c 0 -H -p $destPort $hostORdomain | awk '/mss/ {print \\\$7,\\\$10,\\\$13,\\\$14}'\"" >> .bashrc
source .bashrc

ZSH #

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cd ~
echo 'alias con_check_icmp="ping $hostORdomain |cut -d \"=\" -f 2,4"' >> .zshrc
echo "alias con_check_tcp=\"sudo nping --tcp --delay 1s -c 0 -H -p $destPort $hostORdomain | awk '/mss/ {print \\\$7,\\\$10,\\\$13,\\\$14}'\"" >> .zshrc
source .zshrc

To Execute #

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# For ICMP
con_check_icmp
# For TCP
con_check_tcp
# On terminator "Watch for silence"

Tip #

  • I use Terminator and its plugin "InactivityWatch" to watch if it stops pinging
Last update: January 22, 2021