Below are couple tips to investigate network traffic and database network connections.
netstat -ptc : Display the process ID and tcp connections. If a process with abnormally high in Send-Q, it means that it consumes too much network traffic.
ping and telnet - if you can't connect the remote servers, contact your network admin.
tnsping - check the remote listener and database to make sure they're up and running.
TNS_ADMIN - verify the tnsnames.ora file
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