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Interesting Hardware Bug

I wanted to install a HA device additional to the existing SG230 in one of our subsidiaries.

We had networking problems so I did a tcpdump on several interfaces and so internal traffic on outside interface and vice versa.

Result is (and this is a no-go for a Firewall of course!):

SG230 switched off and without power plugged in connected on Port eth0 to a switch, connecting a client on port eth1: client is connected to the network on the switch.

You see not also the hardware bug but the problem with eth0 and eth1 being the default interfaces for Internet and internal network.

Somebody else with this behaviour?

Waiting for RMA.

I guess it is a hardware problem of the Ethernet Chips, because the are serving two interfaces usually.

The same I see with eth2 and eth3.



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  • OK, that is something.

    I am working in IT-Security since 30 years but I have never seen this until today.

    Default settings of any OS, espacially for Security systems, should be as secure as possible.

    We don't have Security or networking specialists in every subsidiary.

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