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CISCO 880G and PLANET MH-2001 but transparen​t

Hello all.

As my main router i have the CISCO 880G with the ip at the ethernet interface 0 and my WAN connection at my ethernet interface 4.

If the other end of my cable from ethernet intrface 0 i put it to another device which has the IP to its WAN port and define the DMZ port of that other device as transparent with rules to pass all but to register and filter some things.

When i have them like this i cannot reah to neither CISCO neither other device with ip

Anybody has any idea ?

thx in advance.

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