?
Solved

Presenting multiple public IP addresses on a single firewall interface.

Posted on 2008-10-08
7
Medium Priority
?
1,781 Views
Last Modified: 2013-12-25
We have a firewall with a web facing interface of 150.x.x.a
We have purchased several other public ips, 150.x.x.b and 150.x.x.c
How do I make 150.x.x.b available on our firewalls external interface?
I intend to NAT 150.x.x.b to an internal IP address (web server) .

So basically I want to be able to access this internal webserver by entering a different 150.x.x.b
Do we get our ISP to route 150.x.x.b to our firewall external ip address 150.x.x.a, and simply use a static nat?

0
Comment
Question by:rgoggins
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 8

Expert Comment

by:sstone55423
ID: 22675475
WHat kind of firewall?  The firewall needs to be configured to NAT the available IP addresses in the range you purchased.  Different firewalls do that in different ways.
0
 
LVL 1

Author Comment

by:rgoggins
ID: 22675510
Hi,

 its a Cisco ASA 5510 Series.
I have no problem with configuring the NAT. What I really want to know is about the routing?

 Do we just get our ISP to route 150.x.x.b to our current external IP 150.x.x.a and then configure the NAT to our internal server. Is that all that is required to make this web server accessable using 150.x.x.b ?

Thanks,
0
 
LVL 4

Accepted Solution

by:
urgoll earned 800 total points
ID: 22675563
Hello,
assuming 150.x.x.a, 150.x.x.b and 150.x.x.c are all on the same subnet, then you ISP already knows how to route them to you. All you need is to setup a static NAT to your internal server, configure your ACL to allow incoming traffic (if that's the intended purpose) and you are done.

If 150.x.x.b and 150.x.x.c are on a different subnet than 150.x.x.a, then yes you need to have your ISP route those to 150.x.x.a. Otherwise, the NAT and ACL configuration on the ASA is identical.

Hope this helps,
Christophe
0
Understanding Web Applications

Without even knowing it, most of us are using web applications on a daily basis. Gmail and Yahoo email, Twitter, Facebook, and eBay are used by most of us daily—and they are web applications. We often confuse these web applications tools for websites.  So, what is the difference?

 
LVL 6

Assisted Solution

by:Gunter17
Gunter17 earned 400 total points
ID: 22680839
The magic happening here with the ASA is called proxy arp, it will ARP on the 'outside' interface - basically ask the router or bridge device what other IP addresses it can use. Most firewalls do something similiar to this now-a-days.
0
 
LVL 8

Assisted Solution

by:sstone55423
sstone55423 earned 800 total points
ID: 22682686
If you do the NAT, and then allow the appropriate ports through by access list (80, 443), then they will be able to get yo your web server by IP address.  If the IP addresses are static, you have no problems.  You might get a domain name assigned to the IP address to make it easier for users.  (dyndns.com is one of those).  
0
 
LVL 8

Expert Comment

by:sstone55423
ID: 22694531
How is it going?
0
 
LVL 1

Author Comment

by:rgoggins
ID: 22707997
Its working fine thanks for the help.
0

Featured Post

Simplify Your Workload with One Tool

How do you combat today’s intelligent hacker while managing multiple domains and platforms? By simplifying your workload with one tool. With Lunarpages hosting through Plesk Onyx, you can:

Automate SSL generation and installation with two clicks
Experience total server control

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Most of the applications these days are on Cloud. Cloud is ubiquitous with many service providers in the market. Since it has many benefits such as cost reduction, software updates, remote access, disaster recovery and much more.
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
Suggested Courses

649 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question