proc files

[Sellami Pentester]

I'am using *Xubuntu* ...

I want to change in *ip_forward* file in */proc/sys/net/ipv4/* directory
but i cant, it show that I don't have privilege to do that even with
*sudo* command
... But I need to change in that file to test some attacks in my network
"I'am a pentester".

i asked some friends they told me that I can't change in any file in proc
directory but why !!!! I remember I can do that in *Ubuntu* and in *Kali
Linux* ...
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