RE: IP forwarding

Neil Moore-Smith (nms@crescendo.ltd.uk)
Wed, 30 Sep 1998 22:02:23 +0100


On Wednesday, September 30, 1998 8:17 PM, Glynn Clements
[SMTP:glynn@sensei.co.uk] wrote:
> The first thing to check is that IP forwarding hasn't been disabled by
> the init scripts. Check that `cat /proc/sys/net/ipv4/ip_forward'
> prints `1'.

Good grief, Holmes! How did you know that? (Apologies to Conan Doyle)

There is no such file as ip_forward on my system. You seem to have hit the
spot. Hmmmm. So how would the init scripts have disabled it? Is this
definitely a Linux-wide file, or is it specific to a particular
implementation. I have Slackware 2.0.27. (BTW, Is that particularly out of
date? I looked at the source repositories and it seems 2.0.34 is about the
latest. I was a bit dubious about upgrading the kernel on its own, as all
the utilities may then be out of date. Is there a way to tell what else
needs upgrading?)

> Do you need to run a routing daemon? If not, running one will only
> make matters more complex, as you risk having it modify your routing
> tables in interesting ways.

Probably not. I'll turn it off and reboot. (Minutes later...) No, it still
doesn't forward across the subnets.

Thanks for the help, I really do appreciate the way you folks respond.

Neil

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