ip forwarding - permission denied

[Anders Karlsson]

On Friday 01 Apr 2005 06:38, david wrote:
> Greetings

Marnin'

> In my quest for a net connected Zaurus I seem to have hit a problem.
> I need to enable ip forwarding with the following command.
>
> sudo echo 1 > /proc/sys/net/ipv4/ip_forward
>
> But all I get is "permission denied" and I don't understand why. Does
> anyone know what I'm missing here?

I have noticed this as well. It would appear that stdout and stderr does 
_not_ get elevated privilegies when running a command with sudo. The 
command you run (in this case 'echo') runs as root, but stdout is 
running as you, hence the permission problems.

I tested this:
anders at tor:~$ touch file
anders at tor:~$ sudo chown root.root file
anders at tor:~$ sudo chmod 0600 file
anders at tor:~$ /usr/bin/sudo echo "1" > ./file   
bash: ./file: Permission denied

This illustrates the problem and sudo needs tweaking to do what you (and 
I) want it to do. Sorry I could not be of more help than this.

-- 
Anders Karlsson <anders at trudheim.com> | GnuPG Key ID - 0x4B20601A
Senior QA Engineer - McAfee WebShield | finger anders at lenin.trudheim.com

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