How to organize 2 different subnets on one Juniper?

Question

Computer networks

Good day.
We have 1 per physical network. From juniper vlan goes to managed switches. The bottom line is that in one subnet we ran out of addresses, we were allocated half of the other subnet (from xxx129 to xxx254). Also it is necessary to make users so on the same physical network. so that they have access as the first. and to the second subnet. In fact, just 2 subnets come out of one vlan. the server has 2 network cards, one we registered the ip of the first subnet, and the second ip of the second subnet, launched DHCP, it functions and distributes ip addresses. However, there is a problem, after our juniper there is a kind of outside, into which there is no longer an exit from the new subnet. and with the old one they still come out just as calmly. The question is. whether it is possible to have 2 subnets in one physical network. Or is it not provided and will work like this?

Answer 1

In general, no one forbids having as many subnets as you like in one broadcast domain. Add the second (fifth, tenth) address to Juniper and go.
But I would recommend understanding all the same at least at the CCNA level in networks.
And there is no way out of it into the world, most likely because the device through which the external network comes in does not know about the new subnet. Either you need to add the route, or directly on it and hang the address from this subnet.

Answer 2

secondary is hung on Juniper? See NAT/Security Policy rules.