Thu Jan 19, 2012 5:20 am
The default configuration for a RB750G is that the ether1 is the WAN port and 2-5 are the LAN ports. Protecting the LAN from the WAN is it's job. It also want to get it's address and other setup via DHCP from the upstream provider, so AFAIK it doesn't default to anything route-able.
If you're connecting LAN devices to the router you're better off starting at port 5 and working towards port 1. While it's possible to configure all 5 ports as LAN ports, unless you're trying to restrict traffic between parts of the LAN (which means learning how to set up firewall rules and possibly queues) you'd probably be better off with a unmanaged or managed switch.