networking - how to verify tcp keep alive on linux -

networking - how to verify tcp keep alive on linux -

i want set tcp maintain live on linux machine. doing running script

if [ `/sbin/sysctl -n net.ipv4.tcp_keepalive_time` != 200 ] ; /sbin/sysctl -w net.ipv4.tcp_keepalive_time=200;

but still have issues connections amazon's redshift. can please help , show me how can check if tcp maintain live set or not?

to check if maintain live active open connection, don't exchange info , verify tcpdump or similar packets gets regularly exchanged on connection, if no real info exchanged.

but maybe confuse keep-alive timeout:

keep alive: observe if connection still active, e.g. info exchanged if necessary. observe loss of network connectivity etc. maintain live done on tcp layer. timeout: connections gets closed after inactivity. done @ application layer.

in both cases not observe problem until seek read or write on socket.

linux networking tcp amazon-redshift