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Wan/Lan problem

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.
When eth0 is down and eth1 up,
                    the Linux box can access the Win2K shares.
When eth0 is down and eth1 down,
                    it's quiet.

The ATT router is set to 'Pass Through' giving the Linux box the ATT
router's IP address.
The Linux box is set to use DHCP.
This might explain why I loose the LAN connection when eth0 up.

Why can the Linux box not see the web while the Win2K box can?

I've not found or at least recognized the problem in the HowTo's.
Pointer's or suggestions?


#   /etc/hosts    ATTrouter
#    outbound.att.net    att       localhost     playground      play     south40         s40     router
# ----------------------- end hosts

# /etc/networks
# ----------------------- end networks

# /etc/resolv.conf
domain attlocal.net
search attlocal.net
# ----------------------- end resolv.conf

#   /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth1
#   eth0 = onboard eth port
iface eth0 inet dhcp
#   eth1 = 3Com PCI 3c905C card
iface eth1 inet static
        # dns-* options are implemented by the resolvconf package, if installed
# ----------------------- end interfaces

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