two subnet from a single ISP

[ravindra Krishna]

Hi All,

we have an ISP that is providing us one public IP with gateway. Also any traffic NATed with that IP should also be tagged with VLAN 100

Ex: Public IP - 1.1.1.1 and the gateway is 1.1.1.254; VLAN 100

Also same ISP has provided a pool of public IP address 2.1.1.1/29 (No VLAN Tag required) also no gateway provided.

Both the primary IP and the network is routed via single interface from the ISP.

Customer is demanding both the static IP and all the IP address from the network pool be terminated on the WAN interface (interface of the router connected to public Network). They want to host servers on the public pool IP addresses and DNAT the traffic to internal DMZ network (another interface of the router).

Is this possible?

Regards,

Ravi

[Gregory Snipes]

It depends on what router you have, but in general, yes.

You will need to setup subinterfacing on the WAN interface of your router.

Something like this:

int fastEthernet 0/0

ip address 2.1.1.1 255.255.255.248

!

int fastEthernet 0/0.100

encapsulation dot1Q 100

ip address 1.1.1.1 255.255.255.0

Then setup a NAT from the inteface the severs are connected to to the WAN interface.