I have an ISR 1921 SEC as a router for my internet connetion (/28 subnet).
On the inside is an hp Procurve 1900 switch which supports basic routing (static routes).
Suppose i want about 10 VLANs on my LAN, all with different subnets (eg. 10.0.1.0/24, 10.0.2.0/24) and i want all of these VLANs to connect to the internet (NAT) but not to each other.
What would be best-practice to achieve this?
1. A router-on-a-stick solution with one trunked (tagged in HP speak) port to the LAN interface of the 1921 router?
2. Make the default route on all the VLANs of the Procurve point to the ip address of the default VLAN and connect that to the LAN interface of the router, effectively letting the procurve do the routing? Is this even a feasible option?
In the case of option 2, how will i route the traffic back to the right VLAN/subnet? do i need to create static routes for all of them? In the router and/or switch?
And one other question. Suppose i want to start with one public ip NATed to the default VLAN and one other public IP NATed to alle the other VLAN's. Is that possible? And can i change this at a later time to have one or more specific other VLANs NATed to their own public ip?
I would use option 2 if this switch is a L3 switch and put the link to the router as a routed port and configure a default static route pointing to the router IP, the clients would have their respective interface vlan IP as default gateway and then I would nat on the edge router.
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This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
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