Re: attempting ip forwarding... i think!!
- From: "Mikkel L. Ellertson" <mikkel@xxxxxxxxxxxxxxxx>
- Date: Mon, 15 Oct 2007 15:52:28 -0500
sam wrote:
Hi...You can also bridge the two interfaces. The bridge interface then
I have a laptop that's connected to the rest of the network via the wireless
port. It works. I also have the eth0 port that I use to connect to another
box that's not connected to the network.
so
internal box >>>>laptop >>>>> rest of network (internal/internet)
eth0 (eth0) (ath0)
Internal Box eth0:192.168.2.99
laptop
eth0: 192.168.2.33
ath0: 192.168.1.33
Each of the connections work.
I've set up separate subnets on the laptop, as this appears to be the only
way of being able to be able to have both eth0/ath0 active, and
communicating at the same time.
has the IP address, and network traffic passes between eth0 and
ath0. This way, everything can be on the same subnet. But the laptop
would not be acting as a firewall for the rest of the network.
Using the laptop, I can currently access both the box, and the network atWhat is the network setup on the internal box? Does it have
the same time.
However, using the box, I can only access the laptop. Pinging to the rest of
the network, results in "host unreachable", which is expected.
So, I'm trying to figure out what has to be set on:
either the Internal eth0 nic,
or the laptop eth0 nic,
or both the Internal box/laptop
to allow the Internal box to be able to access the rest of the network.
I've been looking high/low to try to figure this out. I need to accomplish
this, as I'd like to update the internal computer with Fedora update rpms
via yum, which requires internet access.
Information that I've come across on the 'net refers to
IPTables/Route/IPMasq/etc....
I've tried to setup iptables on the laptop, to do ip forwarding based on
articles i've seen. I've implemented:
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
/etc/init.d/iptables save
when i then use the Internal Box, to try to access a box on my network, or
the internet, i'm still restricted to only being able to access the laptop.
any thoughts/comments/pointers would be helpful, and appreciated.
thanks
192.168.2.33 as the default gateway? If not, does it have a route
for the 192.168.1.0 network that uses 192.168.2.33 as the gateway?
If not, then noting you do on the laptop is going to help. (Unless
you are running a DHCP server on the laptop, and the internal box is
configured by DHCP - you can change the DHCP server to set the
proper routes and gateways.)
From your description, it sounds like you have a wireless
firewall/router on your Internet connection, and you want to use the
laptop as a wireless to wired bridge. If this is correct, you may
find creating a bridge interface instead of doing NAT will work
better for you. I don't have the URL handy, but there are some good
bridging HOWTOs if you deside to go that route.
Mikkel
--
Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!
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