Re: networking (offlist)
(now on-list)
On Wed, Jul 25, 2001 at 04:41:52PM -0400, Michael Cole wrote:
> Ok, I am trying to get to the internet. I have changed my network address
> to 192.168.0.0. I sort of understand what you are saying about the address
> of the network was a host and I guess having it as the address of the
> gateway didn't help. But I don't understand what you mean by the
> 192.168.x.x address not being routable. I have already tried to reach the
> router/internet with this change in the network address and no luck. Do I
> really need an address there? I don't have NAT as far as I know, but I will
> look around.
I'd strongly suggest reading up on networking, e.g., Linux Netowrk
Administrator's Guide by Olaf Kirch, or other sources. The topic is
not _that_ complicated, but there are terms and issues that make a lot
of sense with some study, and little sense without. By virtue of what
you're trying to do, you _are_ a network administrator.
There are a few address ranges that are defined for local use, meaning
that routers should not forward them (i.e., not routable), and that
includes anything beginning with 192.168. Valid Internet addresses are
unique; if you connect to an ISP via dialup (or cable, I suppose), you'll
be given a unique, valid address to which other machines can reply. You
can setup a Linux box making such a connection to do NAT for other machines
on your local, private network, so that they can access the Internet; outgoing
packets get the NATer's address, and incoming ones are unNATed so that they
get back to the originating host.
Your gateway may be such a machine connecting to an ISP (etc.), or it must
have some other (e.g., permanent) connection to the Internet (or to another
gateway that does). It'll have an address on the local network, and that's
what your routing tables must identify. Your local host uses the netmask
to see if a given destination address is on the local network; if not, the
packet is directed to the gateway for routing.
Beyond that I'm not sure of what you need. Good luck!
Ken
> Thank you,
> Michael
>
> ----- Original Message -----
> From: "Ken Irving" <jkirving@mosquitonet.com>
> To: "Michael W. Cole" <colemw@home.com>
> Sent: Wednesday, July 25, 2001 3:14 PM
> Subject: Re: networking (offlist)
>
>
> > On Wed, Jul 25, 2001 at 02:47:15PM -0400, Michael W. Cole wrote:
> > > I am using linux 2.2.19-20010521 on a IIci and am trying to have it
> > > recognize my router so that I can start to upload the software to
> > > complete the system. I am using this version because the earlier
> > > versions would not acknowledge my ethernet card. This one seems to but
> > > I have set up the network but I can't get it to ping the router or any
> > > of the other computers (Mac PPC and a Windoze) that are also connected
> > > to the router. I have followed the HOW-TO's for networking etc.
> > > /etc/network/interfaces is as follows:
> > > iface lo inet loopback
> > >
> > > iface eth0 inet static
> > > address 192.168.0.3
> > > netmask 255.255.255.0
> > > network 192.168.0.1
> > > broadcast 192.168.0.255
> > > gateway 192.168.0.1
> > >
> > > I followed the route commands that were in the How-To
> > > ie route add -net 192.168.0.3 netmask 255.255.255.0 eth0
> > > route add default gw 192.168.0.1 eth0
> > >
> > > and these things seem to work they reshowed when route was reentered.
> > >
> > > What do I need to read now? I would like to be able to use my cable
> > > modem which is connected to the router and is accessible to the other
> > > two computers on this network.
> > > Any help would be greatly appreciated.
> >
> > It's not clear to me whether you want to get out to the Internet or not,
> > but if so you'll need an address other than on the 192.168.x.x network,
> > since those addresses are not routable. Also the network addr shown is
> > a host address rather than a network; network addresses end in 0. If the
> > gateway is also capable of NAT (network address translation) then what
> > you have may work, since the NAT host changes outgoing packets to a valid
> > internet address.
> >
> > --
> > Ken Irving <jkirving@mosquitonet.com>
> >
>
>
> --
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--
Ken Irving <jkirving@mosquitonet.com>
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