Can WAN Interface and LAN Interface in same subnet?
e.g. WAN Interface = 192.168.2.101 and
     LAN Interface = 192.168.2.100

If yes, then why my PC can ping LAN sis0 192.168.2.100
but not WAN sis1 192.168.2.101?

My network consists of a cable modem connected to a
4 port switch SMCVBR7004VBR which is connected to a PC
and two ethernet ports of the soekris net4521 board.

[cable modem]
     |
     |
{4 port switch/router}
DHCP
LAN-IP: 192.168.2.1 --- [PC] 192.168.2.112
                    |
                    |    soekris net4521
		    |--- sis0  192.168.2.100
                    |
                    |--- sis1  192.168.2.101

I set up LAN IP address for soekris net4521 for
192.168.2.100 with console setup.


I use webGUI http://192.168.2.100 to setup sis1:
Interfaces: WAN
Type: 	Static

IP address 	192.168.2.101/24
Gateway 	192.168.2.1

Option "Block private networks" is unset.






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