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Re: How to turn on IP forwarding?



On 07/10/2004 09:13, Ow Mun Heng wrote:
> On Thu, 2004-10-07 at 14:27, Jonathan Ryshpan wrote:
> > I'm trying to make the machine amito forward packets from machine
> > claremont to machine home.  Claremont pings amito and amito pings home,
> > but claremont doesn't ping home.  All these machines are directly
> > connected via ethernet claremont to amito on 192.168.10.x and amito to
> > home on 172.16.0.x.  I have IP forwarding turned on in amito:
> >
> > 	amito $ cat /proc/sys/net/ipv4/ip_forward
> > 	1
>
> Okay.. IP forwarding is turned on.
>
> > Claremont should have its gateway set up OK:
> > 	claremont $ route
> >         Kernel IP routing table
> >         Destination     Gateway         Genmask         Flags Metric Ref 
> >   Use Iface 192.168.10.0    *               255.255.255.0   U     0     
> > 0        0 eth0 169.254.0.0     *               255.255.0.0     U     0  
> >    0        0 eth0 default         amito.localdoma 0.0.0.0         UG   
> > 0      0        0 eth0
>
> Cool. Default traffic which is not destined for local net is sent to the
> gateway.
>
> > and should know where home is:
> >
> > 	claremont $ cat /etc/hosts
> > 	# Do not remove the following line, or various programs
> >         # that require network functionality will fail.
> >         127.0.0.1		localhost.localdomain localhost
> >         192.168.10.1		amito.localdomain amito
> >         192.168.10.2		claremont.localdomain claremont
> >         172.16.0.1		home home.localdomain
> >
> > What have I missed?
>
> Can you tell us what is the routing table on claremont? since amito can
> ping home, it means there's connectivity.
>
> But since claremont cannot ping home, this could mean several things.
>
> 1. Firewall?
> 2. Wrong routing table.
>
> > BTW: What is the host 169.254.0.0 for?  How does it get into the routing
> > table?
>
> This is so-called zeroconf configuration. Google it up. I forget.
>
> > Thanks - jon
>
> --
> Ow Mun Heng
> Fedora GNU/Linux Core 2 on D600 1.4Ghz CPU kernel
> 2.6.7-2.jul1-interactive
> Neuromancer 15:08:52 up 5:48, 5 users, load average: 0.97, 0.68, 0.63

To make it permanent edit the /etc/sysctl.conf file other wise you will need 
to script it in bashrc.

Cheers
-- 
Chadley Wilson
Redhat Certified Technician 
Cert Number: 603004708291270
Pinnacle Micro
Manufacturers of Proline Computers
====================================
Exercise freedom, Use LINUX
=====================================


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