Where is the TCP retransmission timeout value and retry count set for Android OS?

Where is the TCP retransmission timeout value and number of retries set in Andriod OS?

The file is set to the following directory:

/proc/sys/net/ipv4/

Also, if it exists in the configuration file, is it possible to rewrite it?

I think it's possible.
In the case of Android, it seems that the parameter is rewritten with init.rc.c.実際 I didn't actually check it.
I think the settings are as follows.

on init
    write/proc/sys/net/ipv4/tcp_syn_retries5

The init.rc grammar is described below.

https://android.googlesource.com/platform/system/core/+/master/init/README.md

I think you need to manipulate the boot image to actually rewrite the kernel parameters of the Android device.
Also, because it affects the entire IP communication, extensive testing is expected, so rewriting kernel parameters is not easy.