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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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