SSH connection issue with failover gateway

I have a system which can be accessed via SSH and HTTP. The system have two interfaces (eth0, eth1), and is working with Slackware 14.1. eth0 : 192.168.1.99, LTE Ethernet Gateway/Modem eth1 : 172.16.101.250, Local network (with internet access) eth1 should be used as default route for outgoing traffic, and automatically switch to eth0 when internet not available via eth1. This part is working using a cron and a script. The main concern is that when switching default gateway, the ingoing traffic to SSH and HTTP are working only with the interface of the default gateway. **/etc/rc.d/rc.inet1.conf** # Config information for eth0: IPADDR="192.168.1.99" NETMASK="255.255.255.0" USE_DHCP="no" DHCP_HOSTNAME="bridge" # Config information for eth1: IPADDR="172.16.101.250" NETMASK="255.255.128.0" USE_DHCP="no" DHCP_HOSTNAME="bridge" # Default gateway IP address: GATEWAY="172.16.0.1" Script executed every minute to verify internet availability on both networks #!/bin/bash DEF_GATEWAY="172.16.0.1" # Default Gateway BCK_GATEWAY="192.168.1.1" # Backup Gateway RMT_IP_1="8.8.8.8" # first remote ip RMT_IP_2="8.8.4.4" # second remote ip PING_TIMEOUT="1" # Ping timeout in seconds # Check user if [ whoami != "root" ] then echo "Failover script must be run as root!" exit 1 fi # Check GW CURRENT_GW=ip route show | grep default | awk '{ print $3 }' if [ "$CURRENT_GW" == "$DEF_GATEWAY" ] then ping -c 2 -W $PING_TIMEOUT $RMT_IP_1 > /dev/null PING=$? else # Add static routes to remote ip's ip route add $RMT_IP_1 via $DEF_GATEWAY ip route add $RMT_IP_2 via $DEF_GATEWAY ping -c 2 -W $PING_TIMEOUT $RMT_IP_1 > /dev/null PING_1=$? ping -c 2 -W $PING_TIMEOUT $RMT_IP_2 > /dev/null PING_2=$? # Del static route to remote ip's ip route del $RMT_IP_1 ip route del $RMT_IP_2 fi if [ "$PING" == "1" ] && [ "$PING_2" == "1" ] then if [ "$CURRENT_GW" == "$DEF_GATEWAY" ] then ip route replace default via $BCK_GATEWAY fi elif [ "$CURRENT_GW" != "$DEF_GATEWAY" ] then # Switching to default ip route replace default via $DEF_GATEWAY fi Here are the services listening # netstat -l Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:http *:* LISTEN tcp 0 0 *:auth *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 *:https *:* LISTEN tcp 0 0 *:time *:* LISTEN tcp6 0 0 [::]:ssh [::]:* Here is the routing table # route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 172.16.0.1 0.0.0.0 UG 1 0 0 eth1 loopback * 255.0.0.0 U 0 0 0 lo 172.16.0.0 * 255.255.128.0 U 0 0 0 eth1 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0