I have a router with 4 ports. One is for the servers (via a switch) and one is the pppoe interface towards my ISP.
I have the “default-route auto” on the pppoe interface. And a route to my subnet on the eth1 interface.
This gives me those routes:
0.0.0.0 0.0.0.0 pppoe2
18.104.22.168 255.255.255.192 eth1
22.214.171.124 255.255.255.255 pppoe2
That’s fine and it’s working… now the question:
I’d like to use eth3 as a “service port” and I don’t want any routing to happen to or from this interface. I gave it the IP 192.168.68.1 and it seems to work fine. But I can ping 126.96.36.199 from the 192.168.68.x network (nothing else can be pinged, but this one address is possible). … what’s the recommendation here? Should I add a firewall rule to make sure that I will never have any routing from or to this eth3 port? Or is it just fine like that?? (it it routing by the way? or is what I see not real routing but just… don’t know… something that happens, because the router does have those 3 addresses and reacts on a query to 188.8.131.52 also on the 192.168.68.1 address/port?) … or, if that’s correct what it does… could I then delete the static route to my subnet on eth1 and it would still work? … is the routing “enabled by default”?