Re: Possible case of ip forwarding
- From: Charles Curley <charlescurley@xxxxxxxxxxxxxxxxx>
- Date: Fri, 13 Jul 2007 10:39:51 -0600
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On Fri, Jul 13, 2007 at 04:08:28PM +0200, aravindan wrote:
Hi ,
I have migrated to linux from windows recently. The distro I am
running is FC6 64 bit.
I have a desktop running windows and a laptop running FC6.
Can I have my desktop's internet traffic , go through my laptop
?
Laptop is able to access internet without any issues. Please note
that my laptop has only the single wireless NIC enabled(I dont want
to enable my wired interface for this case) which it uses to go
online.So no case of routing here.
In other words , can my laptop , by being a standalone computer that
it is , act as a default gateway for my desktop ?
I changed my desktop's default default gateway to be my
laptop's ip address.
If I am confusing you guys , here's a small schematic
illustration of my requirement :-
Desktop ----------->>Laptop(ip=x.x.x.216) --> Internet
ip=x.x.x.78
g/w=laptop ip
Laptop's gateway is the default gateway of the network.
My take here is that once the desktop's traffic is destined to
the internet and hits the laptop's NIC , the laptop will drop it
simply because it cannot reroute that packet on its own interface back
to the gateway(192.168.128.254). If I am right about this statement ,
then my question is , how can I tell my laptop to forward the
connection or reroute it ? Or is it possible at all ????
Can I make use of ip forwarding here ?
You will need another NIC on the laptop, to access the internal
network. Since you have only the two machines, a crossover Ethernet
cable should do it, saving you the cost of a switch or hub.
You set up an internal network using an "experimental IP network",
e.g. 192.168.23.0/24. For only two computers, hard code everything on
the internal network. The internal network's gateway is the internal
interface for the gateway machine. E.g. on my network:
[root@dragon ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
0.0.0.0 192.168.1.12 0.0.0.0 UG 0 0 0 eth1
The third line specifies the gateway ("man route" for details).
You then set up the gateway machine to do the routing and
forwarding. I recommend firestarter ("yum install firestarter") for
the job, but there are other tools.
So you get, e.g.:
Desktop <----------------> Laptop <-------------> ISP
192.168.23.23 192.168.1.1 10.0.0.45 10.0.0.1
You might read up on networking at, e.g., the Linux Documentation
Project (http://www.tldp.org/).
--
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