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New Member

Multiple public address spaces on one Pix outside interface

I currently have a pix (6.3) with the outside interface configured as part of a /27 bit public ip space. We are running out of addresses and need to purchase another range. Can I make this work using the existing pix and without tampering with the existing range in use? Basically, can I route a new address space to my existing pix and set up statics for that space even though the interface is assigned an ip address on a different range?

1 ACCEPTED SOLUTION

Accepted Solutions
Silver

Re: Multiple public address spaces on one Pix outside interface

YES, it can be done rather easily.

Example: your outside interface is

129.174.1.1/27. Now you want to add another

141.141.141.0/24 to your outside interface.

Is that correct?

The technique is to use routing IP NAT Pool.

In this example, you will add a static route

on the upstream router like this:

ip route 141.141.141.0 255.255.255.0 129.174.1.1

Now you can do static NAT on the pix as

this:

static (i,o) 141.141.141.0 192.168.1.0 netmask 255.255.255.0

Easy right?

3 REPLIES
Silver

Re: Multiple public address spaces on one Pix outside interface

YES, it can be done rather easily.

Example: your outside interface is

129.174.1.1/27. Now you want to add another

141.141.141.0/24 to your outside interface.

Is that correct?

The technique is to use routing IP NAT Pool.

In this example, you will add a static route

on the upstream router like this:

ip route 141.141.141.0 255.255.255.0 129.174.1.1

Now you can do static NAT on the pix as

this:

static (i,o) 141.141.141.0 192.168.1.0 netmask 255.255.255.0

Easy right?

New Member

Re: Multiple public address spaces on one Pix outside interface

Thanks for the confirmation. I needed a quick answer and wasn't in a spot to test it out. Since you used a pool example, can I assume that I can also create individual statics -

static (i,o) 141.141.141.10 192.168.1.10 ?

Silver

Re: Multiple public address spaces on one Pix outside interface

That's correct.

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