[NTLUG:Discuss] can't ping outside

[Peter Smith]

Sounds to me like you need to turn on the kernel's IP_FORWARDing features
(they were most likely defaulted on you old box.)  You'll need to check
the current state of forwarding by issuing this command as root:

cat /proc/sys/net/ipv4/ip_forward

It it returns "0" then you know that is the problem.  For any data to get
from one NIC to the other NIC you _have_ to have ip_forward set to "1".
So you need to issue this next command as root:

echo 1 >/proc/sys/net/ipv4/ip_forward

There is most likely a place in your Redhat install's config where you
should permanently set this.  You'll probably want to look into
"linuxconf" to access the networking menus where linuxconf's scripts will
always set this kernel proc variable.

Hope this helps,
Peter

On Wed, 7 Jun 2000 bobby at wrennest.com wrote:

> I just set up a new router for my dsl line. On the old router I can ping
> inside addresses (192.168.1.x) and the address of the nic connected to
> the dsl. I can also ping address out in the world. Other services work
> fine (lynx, ncftp, etc).
> 
> On the new box configured with RH6.0 with both nic's enabled. I can do
> all of the above except ping addresses out in the world.
> 
> Where do I turn icmp on and off or is it something else I am missing. I
> know I never did anything on the old box to make pings work they just
> always have.
> 
> Thanks to all for any help
> Bobby
> -- 
> This tagline is identical to the one you are reading.
> 
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