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$ sudo echo 1 >/proc/sys/net/ipv4/ip_forward 
bash: /proc/sys/net/ipv4/ip_forward: Permission denied

then I try to get write privilege, also failed.

$ sudo chmod a+wx /proc/sys/net/ipv4/ip_forward 
chmod: changing permissions of `/proc/sys/net/ipv4/ip_forward': Operation not permitted

what is wrong?

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should use $ sudo bash -c "echo 1 >/proc/sys/net/ipv4/ip_forward" –  Victor S Aug 15 '13 at 14:43
    
related: Redirect the output using sudo –  JonnyJD Aug 26 at 8:53

1 Answer 1

You are trying to change the kernel values. Be sure of what you are doing.

Okay here is how you can change the value of ip_forward with root privilege (sudo -i)

  • First check the value of ip_forward using command: sysctl -a | grep ip_forward
  • Now using sysctl -w <parameter=value> you change the value of ip_forward:
    • sysctl -w ip_forward=1
  • Make these changes to reflect in kernel using: sysctl -p
  • Do the first step once again to check the values.

I recommend you to go through the man page of sysctl

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