How to turn on IP forwarding?
Ow Mun Heng
Ow.Mun.Heng at wdc.com
Thu Oct 7 09:40:46 UTC 2004
On Thu, 2004-10-07 at 17:13, Jonathan Ryshpan wrote:
> On Thu, 2004-10-07 at 00:13, 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
> > > 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
> > >
> > > claremont $ cat /etc/hosts
> > > 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.
>
> The above routing table **is** the routing table in claremont.
> The firewall in amito is turned off.
Perhaps you can try to do a tcpdump/ethereal trace
--
Ow Mun Heng
Fedora GNU/Linux Core 2 on D600 1.4Ghz CPU kernel
2.6.7-2.jul1-interactive
Neuromancer 17:40:00 up 8:19, 9 users, load average: 0.91, 0.48, 0.38
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