arizonajon -
Using setup, I assigned IP address 192.168.0.239/30 (part of an existing network) to the ether1 interface. I did not assign a gateway address at this time.
Ok - so add the gateway - sure the MT knows about your network but it doesn't know where to send things that it does not reconize.
I thought the default routes that MT sets up when you assign IP addresses to the interfaces would automatically "connect" the two interfaces, so if a packet for an interface is inbound on the other interface, the router will automatically forward it. But, this appears not to be the case?
It is the case but you still have to tell it where to send things that it does not know about through the routing chain. Sure it 'knows' that 192.168....is on one interface, and it knows that 10.1.0.xxx is on the other, but it does not know what you want to do w/packets that arrive w/diffent IP source addresses than the interface has.
So go to winbox, click on IP, click on routes, select the rules tab. Put 0.0.0.0/0 in Src Address, put 0.0.0.0/0 in the Dst Address. In the action, select Lookup, and in table select Main.
And lastly so that you netwok can traverse interfaces... Either your core router needs to know where to send packets destined for 10.1.0.0/30 or your need to add a src nat rule in the firewall section on you MT to src nat your 10.1.0.0/30 ips to 192.168.xxx addresses.
****I also noticed that in your first post you said 10.1.0.0/24 now you're saying 10.1.0.1./30 which is it? Also in your original post you did not mention a 192.168 network but now you have one and it's only a /30... You need to tell a little more about your network - not the public IPs bit the rest otherwise anything we suggest will just be a guess. ****
So arizonajon - are you going ot give us the real setup so we can help?
Thom