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Re: Wan/Lan problem

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On Tue, Mar 28, 2017 at 04:46:02PM -0700, Mike McClain wrote:
> Howdy,
> I have a WAN/LAN challenge I'm hoping for help with.
> I'm runniing Debian 7.11 on a Pentium 3 with 250MB ram.
> mike@/deb7:~> uname -a
> Linux playground 3.2.0-4-686-pae #1 SMP Debian 3.2.84-2 i686 GNU/Linux
> The situation is this:
>      phone        eth0         eth1
> AT&T-------|   |--------|   |--------|   |-------|   |
>         AT&T modem/     Linux         my         Win2K
>             router       box         router       box
> When eth0 is up and eth1 down,
>                     the Linux box can access the web.
>                     'ping ATTrouter' works.
> When eth0 is up and eth1 up,
>                     the Linux box can not access the web.
>                     the Win2K box can access the web.
>                     the Linux box can not access the Win2K shares.
>                     'ping ATTrouter' fails.
>                     'ping -Ieth0 ATTrouter' works.

To repeat what Dan said with slightly different wording... check
your routing here:

  /sbin/route -n

(and check that above, "when eth0 is up and eth1 is down").

I'll bet that the "Linux box" default route has moved from
"AT&T modem/router" to "my router", and now things that the
InterTubes are now to be found that way.

(I skip the rest for when we have some more light on the
above part -- bumping one's head on a Gateway Goblin is no
fun ;-)

- -- tomás
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