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(?) The Answer Guy (!)


By James T. Dennis, tag@lists.linuxgazette.net
LinuxCare, http://www.linuxcare.com/


(?) IP forwarding and Linux

From Hal Pomeranz on Mon, 26 Jul 1999

Jim--

I admit that I'm being lazy and not searching for the answer in a FAQ, but could you tell me the right incantation under Linux to disable IP forwarding on multi-homed machines. Thanks muchly in advance!

--Hal

(!) It's already the default setting for most Linux kernels. However, you can force it with:
echo 0 > /proc/sys/net/ipv4/ip_forward
(you can 'cat' the contents of that node to view the current setting). It's more commonly necessary to use:
echo 1 > /proc/sys/net/ipv4/ip_forward
... to ENABLE the forwarding.
Of course this assumes that you have /proc enabled in your Linux kernel (also the default and STRONGLY recommended). I believe there's also a sysctl() interface to this, in case you've stubbornly built your system without /proc support (and replaced the entire procps suite of utilities including your 'ps' command).


Copyright © 1999, James T. Dennis
Published in The Linux Gazette Issue 44 August 1999
HTML transformation by Heather Stern of Starshine Techinical Services, http://www.starshine.org/


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