Billion UK Forum

Hi there,

I'm thinking of buying a block of real IPs for my home lab. I've been looking at how I might make these addressable on my 7800n router. I can see there's a one-to-one NAT feature which looks to NAT a complete external IP address (and all associated ports) to an internal IP. Seeing as IPs are expensive, and I really only need to NAT certain ports, it possible to support a one-to-many NAT scenario instead?

Example:

Scenario 1
External IP: 100.100.100.100:21
Internal IP: 192.168.1.1:21


Scenario 2
External IP: 100.100.100.100:22
Internal IP: 192.168.1.2:22

... just thinking that make for a more efficient use of the available IPs. I could be way off track here with my thinking of course.

Thx, froowstie

froowstie wrote:Hi there,

I'm thinking of buying a block of real IPs for my home lab. I've been looking at how I might make these addressable on my 7800n router. I can see there's a one-to-one NAT feature which looks to NAT a complete external IP address (and all associated ports) to an internal IP. Seeing as IPs are expensive, and I really only need to NAT certain ports, it possible to support a one-to-many NAT scenario instead?

Example:

Scenario 1
External IP: 100.100.100.100:21
Internal IP: 192.168.1.1:21


Scenario 2
External IP: 100.100.100.100:22
Internal IP: 192.168.1.2:22

... just thinking that make for a more efficient use of the available IPs. I could be way off track here with my thinking of course.

Thx, froowstie

When using One to One NAT mode with range of static IP's, the WAN IP's entered in the one to one nat section will be totally exposed to the internet (word of warning)

Eg

Routers WAN IP - 78.34.65.211

WAN - 78.34.65.212 (one to one NAT WAN IP)
Internal IP - 192.168.1.100 (HTTP Server)

WAN - 78.34.65.213 (one to one NAT WAN IP)
Internal IP - 192.168.1.101 (FTP Server)

Hi -

Yes I understand that's how one-to-one NAT works, the IPs will be attached to locked down services on the internal network.

You didn't really answer my question though. Is it possible to perform the one-to-many NAT scenario I described? I'm assuming not....

froowstie wrote:Hi -

Yes I understand that's how one-to-one NAT works, the IPs will be attached to locked down services on the internal network.

You didn't really answer my question though. Is it possible to perform the one-to-many NAT scenario I described? I'm assuming not....

Only one external IP can be mapped to one internal IP