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seem sysctl -w command not persistent after reboot

#sysctl -w net.ipv4.tcp_keepalive_intvl=1 net.ipv4.tcp_keepalive_time=5 net.ipv4.tcp_keepalive_probes=5

i had to edit the file /etc/sysctl.conf and add there the lines in

net.ipv4.tcp_keepalive_intvl=1 net.ipv4.tcp_keepalive_time=5 net.ipv4.tcp_keepalive_probes=5

seem sysctl -w command not persistent after reboot

 #sysctl  -w net.ipv4.tcp_keepalive_intvl=1  net.ipv4.tcp_keepalive_time=5  net.ipv4.tcp_keepalive_probes=5

net.ipv4.tcp_keepalive_probes=5

i had to edit the file /etc/sysctl.conf and add there the lines in

net.ipv4.tcp_keepalive_intvl=1
net.ipv4.tcp_keepalive_time=5
net.ipv4.tcp_keepalive_probes=5

net.ipv4.tcp_keepalive_probes=5