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Monitor OPNsense internet connection

OPNsense sometimes "loses" the WAN facing connection when that is "reinitialised" (modem reboot/WAN restart).

Monitoring the WAN facing connection and taking corrective action is the solution proposed by this script.

opnsense_ping_check.sh will ping IP addresses to determine if the WAN connection is still working, and try to restore the WAN if needed by

YubiKey 4 series GPG and SSH setup guide

Written for fairly adept technical users, preferably of Debian GNU/Linux, not for absolute beginners.

You'll probably be working with a single smartcard, so you'll want only one primary key (1. Sign & Certify) and two associated subkeys (2. Encrypt, 3. Authenticate). I've published a Bash function which automates this slightly special key generation process.

THIS GIST WAS MOVED TO TERMSTANDARD/COLORS REPOSITORY.

PLEASE ASK YOUR QUESTIONS OR ADD ANY SUGGESTIONS AS A REPOSITORY ISSUES OR PULL REQUESTS INSTEAD!

	#!/bin/sh

	EGREP=/usr/bin/egrep
	ECHO=/bin/echo
	EXTENSIONS_INI=/usr/local/etc/php/extensions.ini
	CP=/bin/cp
	MV=/bin/mv

	HAS_SPL=`$EGREP -c '^extension=spl.so$' $EXTENSIONS_INI`
	HAS_SQLITE=`$EGREP -c '^extension=sqlite.so$' $EXTENSIONS_INI`

	if [[ -o login ]]; then
	TMUX_PREFIX=""
	if [[ ! -z "$TMUX" ]] ; then
	# Via
	# <http://blog.yjl.im/2014/12/passing-escape-codes-for-changing-font.html>:
	TMUX_PREFIX='\ePtmux;\e'
	TMUX_POSTFIX='\e\\'
	fi

	# Indicates start of command output. Runs just before command executes.