Comment by Too
3 years ago
To be fair, the linux defaults of 2h are not working in most enterprise or cloud environments. One frequently encounter load balancers, firewalls and other proxies that drop connections after around 5-15 minutes. 15 seconds sounds very aggressive though.
The default of 2h is not just a Linux default; it's straight up from the RFC.
https://www.rfc-editor.org/rfc/rfc9293.html#name-tcp-keep-al...
> Keep-alive packets MUST only be sent when no sent data is outstanding, and no data or acknowledgment packets have been received for the connection within an interval (MUST-26). This interval MUST be configurable (MUST-27) and MUST default to no less than two hours (MUST-28).