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Re: Wan/Lan problem

On 03/28/2017 04:46 PM, 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.
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?

Thanks,
Mike

#   /etc/hosts
192.168.1.254    ATTrouter
#192.168.1.64    outbound.att.net    att
127.0.0.1       localhost
192.168.1.2     playground      play
192.168.1.3     south40         s40
192.168.1.1     router
# ----------------------- end hosts

# /etc/networks
default		0.0.0.0
loopback	127.0.0.0
link-local	169.254.0.0
localnet	192.168.1.0
# ----------------------- end networks

# /etc/resolv.conf
domain attlocal.net
search attlocal.net
nameserver 192.168.1.254
# ----------------------- 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
        address 192.168.1.2
        netmask 255.255.255.0
        network 192.168.1.0
        broadcast 192.168.1.255
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 208.67.222.222 208.67.220.220
# ----------------------- end interfaces


1.  What is the purpose of "Linux box"?
2. What is the make and model of "my router"? What is its purpose? What port is the "Linux box" connected to? What port is the "Win2K box" connected to? 

3.  What is the purpose of "Win2K box"?
4. Are there any other devices or hosts, such as a Wi-Fi access point, Wi-Fi interface in "my router", pods, phones, tablets, game consoles, laptops, etc.? 


David
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