ethernet oddity

[Sandy Harris]

On Sat, Apr 5, 2008 at 9:52 AM, debiani386 <debiani386 at gmail.com> wrote:
> Sandy Harris wrote:
>  > I have two machines, recently installed Xubuntu on both.
>  > One Ethernet works and the other does not.
>  >
>  >  Both use static IPs, 172.31.255.[12], they talk to the
>  >  same router, and switching cables or router ports does
>  >  not help. Xubuntu on both is 7.10 Gutsy.
>  >
>  >  I used 1386 on both even though one is AMD, because
>  >  one will be an xterm to the other and it seemed easier
>  >  to just have one architecture. The AMD is working, and
>  >  the Intel-based machine not, though, so architecture is
>  >  not the problem.
>  >
>  > Working machine has onboard 10/100 network that
>  > uses Sundance driver.
>  >
>  > One with problems is Core 2 duo on a Gigabyte board,
>  > model #GA-G31M-S2L. Gigabyte docs say the onboard
>  > gigabit ethernet uses Realtek R8111B chip, and lspci
>  > says 8111/8168B, but the driver that is loading is R8169.
>  > Could that be the problem?
>  >
>  >  pinging its own address, 172...2 works, but not the
>  >  router at .254 or other machine at .1. Router does
>  >  respond to pings from the other machine.
>  >
>  >
>  ok so what it looks like you are trying to do is get it to route out to
>  the internet (or atleast use your computer as a route to your router).

No I have a router that works fine. It connects to the net and does
NAT., DNS caching and DHCP That all works. Behind that router are
two machines.  Neither of those machines needs to do any routing,
except to talk to their local network and know where the gateway is.
Nor do they need to do NAT; the router does that.

One connects to the router just fine; I'm sending this message
from it. The other one fails. I do not need anything fancy here;
I just need to get that machine's ethernet interface working.

>  In which case, you need to use firestarter.
>
>  To install it, type sudo apt-get install firestarter
>
>  a guide on setting up internet connection sharing with firestarter can
>  be found at: *http://www.fs-security.com/docs/connection-sharing.php
>
>
>  hth
>  --cj
>  *
>
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-- 
Sandy Harris,
Nanjing, China