Playing around the Dual WAN failover for the first time.. seems confusing the two network monitoring options are checkboxes - I'd expect it to be one or the other?
Either neither are checked (default) = how does failover ever work? Is there something else?
If one is checked = seems to work
If both are checked = would both need to fail to invoke failover? (hard to test without quite a bi
The built in failover options are not worth a crap, I enabled Dual WAN and created a couple scripts that execute every minute via cronjob and will monitor for a failure event and switch WAN if necessary. May require some tweaking in your set up but it works for me.
WAN Failover script to monitor and switch to secondary.
Code:
#!/bin/sh
# Cause the script to exit if errors are encountered
set -e
set -u
# Checking if script is already running
echo "Checking if $0 is already running..."
if [[ "$(echo $(ps | grep -v "grep" | grep -e "$0" | wc -l))" -gt "5" ]] >/dev/null; then
echo "$0 is already running..."
else
# Checking if Secondary WAN is active connection
echo "Checking if Secondary WAN is active connection..."
if [[ "$(nvram get wan0_primary)" == "0" ]] & [[ "$(nvram get wan1_primary)" == "1" ]] >/dev/null;then
echo "Secondary WAN is active connection."
else
echo "Monitoring Primary WAN for failure..."
until [[ "$(echo $(nvram get wan0_gateway))" == "192.168.1.254" ]] || [[ "$(echo $(nvram get wan0_gateway))" == "0.0.0.0" ]] || [[ "$(echo $(ping $(nvram get wan0_gateway) -c 4) | grep -o "4 packets transmitted, 4 packets received")" != "4 packets transmitted, 4 packets received" ]] >/dev/null;do
echo "$(echo $(date | awk '{print $2} {print $3} {print $6} {print $4}')) - Primary WAN Online..." >/dev/null
sleep 3
done
echo "Switching Secondary WAN to active connection..."
until [[ "$(echo $(nvram get wan0_primary))" == "0" ]] & [[ "$(echo $(nvram get wan1_primary))" == "1" ]] & [[ "$(echo $(ip route show default | awk '{print $3}'))" == "$(echo $(nvram get wan1_gateway))" ]] >/dev/null;do
nvram set wan1_primary=1 && nvram set wan0_primary=0
ip route del default
ip route add default via $(nvram get wan1_gateway) dev $(nvram get wan1_gw_ifname)
done
echo "Secondary WAN is now active connection."
fi
fi
WAN Failback script to monitor when Primary WAN comes back online and switches back.
Code:
#!/bin/sh
# Cause the script to exit if errors are encountered
set -e
set -u
# Checking if script is already running
echo "Checking if $0 is already running..."
if [[ "$(echo $(ps | grep -v "grep" | grep -o "$0" | wc -l))" -gt "5" ]] >/dev/null; then
echo "$0 is already running..."
else
# Checking if Primary WAN is active connection
echo "Checking if Primary WAN is active connection..."
if [[ "$(nvram get wan0_primary)" == "1" ]] >/dev/null;then
echo "Primary WAN is active connection."
else
echo "Monitoring Primary WAN for restoration..."
while [[ "$(echo $(ping $(nvram get wan0_gateway) -c 4) | grep -o "4 packets transmitted, 4 packets received")" != "4 packets transmitted, 4 packets received" ]] || [[ "$(echo $(nvram get wan0_gateway))" == "192.168.1.254" ]] || [[ "$(echo $(nvram get wan0_gateway))" == "0.0.0.0" ]] >/dev/null;do
echo "$(echo $(date | awk '{print $2} {print $3} {print $6} {print $4}')) - Primary WAN Offline..." >/dev/null
sleep 3
done
if [[ "$(echo $(ping $(nvram get wan0_gateway) -c 4) | grep -o "4 packets transmitted, 4 packets received")" = "4 packets transmitted, 4 packets received" ]] >/dev/null;then
echo "Primary WAN is online..."
echo "Switching Primary WAN to active connection..."
until [[ "$(echo $(nvram get wan0_primary))" == "1" ]] & [[ "$(echo $(nvram get wan1_primary))" == "0" ]] & [[ "$(echo $(ip route show default | awk '{print $3}'))" == "$(echo $(nvram get wan0_gateway))" ]] >/dev/null;do
nvram set wan0_primary=1 && nvram set wan1_primary=0
ip route del default
ip route add default via $(nvram get wan0_gateway) dev $(nvram get wan0_gw_ifname)
done
echo "Primary WAN is now active connection."
else
echo "Primary WAN is not online..."
fi
fi
fi
I created an all new script and posted here:
https://www.snbforums.com/threads/dual-wan-failover-script.78978/
