For VS/TUN clusters, first you need to configure tunl0 device up, then configure VIPs on the aliases of tunnel/dummy/loopback device and hide that device. A configuration example is as follows:
# Insert the ipip module insmod ipip # Make the tunl0 device up ifconfig tunl0 up # Start the hiding interface functionality echo 1 > /proc/sys/net/ipv4/conf/all/hidden # Hide all addresses for this tunnel device echo 1 > /proc/sys/net/ipv4/conf/tunl0/hidden # Configure a VIP on an alias of tunnel device ifconfig tunl0:0 <VIP> up
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