cat /proc/sys/net/ipv4/conf/eth0.100/forwarding0sysctl net.ipv4.conf.eth0.100.forwardingerror: "net.ipv4.conf.eth0.100.forwarding" is an unknown keyuname -aLinux ip-172-31-45-203 4.9.38-16.33.amzn1.x86_64 #1 SMP Thu Jul 2001:31:29 UTC 2017 x86_64 x86_64 x86_64 GNU/Linuxcat /etc/issueAmazon Linux AMI release 2017.03best regards, Sala