Re: Problems setting up DNS, gateway und subnetmask!
- From: Alan Adams <alan.adams@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 29 Dec 2005 23:01:33 GMT
In message <slrndr5qsd.9c.ibuprofin@xxxxxxxxxxxxxxxxx>
ibuprofin@xxxxxxxxxxxxxxxxxxxxxx (Moe Trin) wrote:
> On Wed, 28 Dec 2005, in the Usenet newsgroup comp.os.linux.setup, in article
> <43b1d7dc$0$3797$9b4e6d93@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Tamer Higazi wrote:
>
> >I have received from my ISP an IP, DNS, Subnetmask and the DNS
> >Serverentries to add to my ubuntu linux machine
I *think* what you have is the information for connecting your machine via a
modem. You appear however to be using a router.
The interpretation, if my guess is correct is as follows:
On the WAN (ADSL or whatever) side of your router are two addresses -
81.10.53.21, and 81.10.53.22. One of these is your router's IP address for
the WAN interface, and the other is the remote end of the link. You don't
need to worry about these if your router is connecting.
On the LAN side of your router, i.e. the wiring between the router and your
machine, you are using the private network 10.0.0.x. For this to work your
machine needs to have an address in the 10.0.0.<1-254> range. The router is
10.0.0.138, so don't use that for your machine.
(For this network, the "official" subnet mask is 255.0.0.0, giving addresses
from 10.0.0.1 to 10.255.255.254. However you need to use the mask that is
set on the router, which may be different. Addresses below 10.0.0.254 will
work with any likely mask, provided the mask you set on your machine does
match that on the router.)
You may well find that the router is also the DNS server and DHCP server,
which simplifies things quite a lot.
I can't help you with the routing commands - I'm new to Linux myself.
>
> The information is wrong.
>
> >iface eth0 inet static
> >address 81.10.53.22
> >netmask 255.255.255.252
>
> Looking at RFC1878, that mask says there are four IP addresses on this
> segment:
>
> 81.10.53.20 "Network" address - probably not usable for a host
> 81.10.53.21
> 81.10.53.22
> 81.10.53.23 "Broadcast" address - not usable
>
> >gateway 10.0.0.138
>
> And how does one reach that address? It is not one of the four addresses
> noted above.
>
> >My File /etc/hosts:
>
> Generally, it is a good idea to list the IP address of "this" host, so it
> can boot properly if the name server is not reachable.
>
> >If I enter the command route:
>
> Yes
>
> >sudo route add default gateway 10.0.0.138 eth0
> >
> >I receive this errormessage:
> >SIOCADDRT: Das Netzwerk ist nicht erreichbar (Network unreachable)
>
> Yes - because you can not reach 10.0.0.138 from 81.10.53.20/28. The
> gateway MUST be on the "local" interface (which _probably_ means it
> is 81.10.53.21).
>
> Old guy
--
Alan Adams, from Northamptonshire
alan.adams@xxxxxxxxxxxxxxxxxxxxxxxxxxx
http://www.nckc.org.uk/
.
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