check the liveness of the VPN for other stuff

vpn-live.sh

#!/bin/zsh

CHK_URL="http://test-destination-host"

# note you need to redireect STDERR -> STDOUT since wget outputs the headers on STDERR
HEADERS=`wget --server-response --spider --quiet -T 1 -t 1 ${CHK_URL} 2>&1`
HEADERS_RET=$?

if [[ ${HEADERS_RET} == 4 ]] {
    echo "some sort of network error occurred"
    echo "----------------------------------------------------------------------"
    echo ${HEADERS}
}