Re: /etc/sysctl

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Around Wed, Mar 31, 2004 at 03:31:51PM -0500,  shane c branch, wrote:
> What is the best way to configure this file? I see documentation that 
> suggests
> #sysctl -w <setting>
> 
> and also some suggestions to edit the file manually. However, when I 
> look at the file, there's not much in there. Just two or three settings, 
> rather than many settings, with the disabled ones commented out.
> 
> Also, once I get it configured, how do I make it take effect without a 
> reboot?
> -- 
Here's some additional settings:
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.secure_redirects = 0

These are taken from suggestions for ways to secure Redhat 9.  
Once you have what you want to add in sysctl.conf, then just
sysctl -p 
should load the changes.
or 
sysctl -p some-other-file
if you haven't used the default /etc/sysctl.conf


You should be able to then do a 
cat /proc/sys/net/ipv4/conf/default/secure_redirects
to verify the setting of the last one in my list.  
Come to think of it, you may want to see what the setting is before you
run sysctl -p  (with whichever settings you want to add that is)

roger


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