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From what I understand form a link on this site is that if you add some such settings/lines to the /etc/rc.d/rc.local file, the settings will be kept after reboot, and these lines are saved in the /etc/rc.d/rc.local file, but not the value in /proc/sys/net/core/rmem_default, for example. I have also tried to use quotation marks around values, i.e. "255552", to no avail. (By the way, when settings in place, surfing is very quick!!!). Although this question has been asked, the solution does not seem to work; but perhaps I am missing something. As I am new to linux (and this site), if anyone has any solution on how I can keep the values I want without linux reverting to it's defaults after reboot, please be as specific as you can.
p.s. I wonder if cat command will overwrite these settings into place. Any thoughts?