How to turn on IP forwarding?
Chadley Wilson
chadley at pinteq.co.za
Thu Oct 7 08:17:05 UTC 2004
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
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