In webadmin when setting the MTU size for ETH0(internal) you simply select "Standard Ethernet Interface" then click "Advanced Options" and MTU appears at the bottom of the screen. The problem I have is ETH1(external) is "PPPoE-DSL" but when you select "Advanced Options" the MTU window does not appear.
Strangely, when I check MTU sizes in REPORTING>NETWORK>"System Interfaces" I see ETH0=1492, ETH1=1500, and ppp0=1492. 1492 is the correct MTU for my ISP but I cannot modify ETH1 due to the above webadmin issue. Is this a BUG or was this meant to be? Thanks and ASL is a wonderful piece of software especially for a LINUX noob like me!
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