Question

PIX 506 multiple public IP Addresses to be forwarded through to different web servers

Asked by: chouckham

Currently we have our PIX outside interface setup with one of our Public IP addresses eg. 1.1.1.2 (Default gateway of 1.1.1.1) which needs to stay in place.
(I know its not possible to assign multiple IP addresses to one interface on the PIX)

We have a few Public IP's available for use eg 1.1.1.3 to 1.1.1.14

What im looking for is a solution to have 3 web servers behind the PIX which all have different Public IP's (also different from the IP currently assigned to the router)

Ive been looking through some ideas of obviously forwarding the request through to the web servers but how do i make the PIX listen for those Public IP addresses?

Many thanks for reading, hope i made it clear enough to understand.

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Asked On
2007-01-31 at 01:28:56ID22143336
Tags

multiple

,

pix

,

ip

Topics

Miscellaneous Networking

,

Network Software Firewalls

,

Network Routers

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Points
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Comments
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Answers

 

by: smartram78Posted on 2007-01-31 at 01:59:43ID: 18434653

PIX does not support 2 Ip addresses for an Interface.

What you can do to use the new series of Ip addresses in your network is, just give a static route to your router for the network pointing to the PIX outside interface. Then do a ststic mapping at the PIX end with the server.

Hope this solves your problem.

ramesh

 

by: chouckhamPosted on 2007-01-31 at 02:52:20ID: 18434863

Yeah i do understand that you can only assign one IP address to an interface (which is a pain)

So im guessing what your saying is... we could set up the internal web servers with the external IP addresses and static routing to the outside interface on the PIX and static route on PIX to webserver?
eg. below

------- PublicIP-1 outside (PIX) inside ----- (Switch) ----------- PublicIP-2 (WebServer1)
                                                                                |------------ PublicIP-3 (Webserver2)
                                                                                |------------ PublicIP-4 (WebServer3)




Here is a result i found for a possible solution whilst searching on here:
------------------------------------------------------------------------------------------
On the implementation side, you could have multiple internal ips bound to the same webserver and then map out different ip addresses.

So; lets say it goes like this;

10.1.1.1 -> Site1

10.1.1.2 -> Site2 etc...

In that case you can map it as;

static (inside,outside) PublicIP-1 10.1.1.1 netmask 255.255.255.255
static (inside,outside) PublicIP-2 10.1.1.2 netmask 255.255.255.255

access-list ForWeb permit tcp any host PublicIP-1 eq https/http (based on whether it is http or https)
access-list ForWeb permit tcp any host PublicIP-2 eq https

access-list ForWeb in interface outside.

This should be possible and you need to take care of binding individual ip addresses (internal) for individual websites.

Cheers,
Rajesh
------------------------------------------------------------------

Does anyone think the above solution could work?
im about to try it now...                                  

 

by: chouckhamPosted on 2007-01-31 at 03:47:01ID: 18435036

OK this is what i have tried.

webserver behind PIX IP = 172.16.174.30
PIX = 1.1.1.2
Public IP used to acces webserver = 1.1.1.3

static (inside, outside) tcp 1.1.1.3 80 172.16.174.30 80 netmask 255.255.255.255
access-list outside_in permit tcp any host 217.22.149.3 eq 80
access-group outside_in in interface outside
write mem

But still i have no luck with connecting to the webserver
Any Ideas?

 

by: smartram78Posted on 2007-01-31 at 04:16:05ID: 18435150

you need to give a static route to the 217.x.x.3 Ip on your router.

make sure that the ISPs have pointed that route towards your end.

on the router

ip route 217.x.x.3 255.255.255.255 1.1.1.2

1.1.1.2 is assumed as your PIX outside interface address.

ramesh

 

by: chouckhamPosted on 2007-01-31 at 05:07:37ID: 18435410

The router your talking about putting that static route on is controlled by our ISP.
if i got them to enable that static route. would that be the answer plus the above config that i have already got?

 

by: lrmoorePosted on 2007-01-31 at 05:12:32ID: 18435438

>static (inside, outside) tcp 1.1.1.3 80 172.16.174.30 80 netmask 255.255.255.255
>access-list outside_in permit tcp any host 217.22.149.3 eq 80
>access-group outside_in in interface outside

I know you're trying to mask your real IP's and that's OK, but looks like you slipped up here. Does the static public IP match the access-list IP?
Is the PIX inside IP address the default gateway for this server 172.16.174.30?
You can use as many statics as you have IP's either by virtue of the mask assigned to the outside interface, or the ISP can route a block of IP's to your interface IP.

clear xlate
static (inside, outside) tcp 1.1.1.3 80 172.16.174.30 80 netmask 255.255.255.255
static (inside, outside) tcp 1.1.1.4 80 172.16.174.34 80 netmask 255.255.255.255
static (inside, outside) tcp 1.1.1.5 80 172.16.174.35 80 netmask 255.255.255.255
access-list outside_in permit tcp any host 1.1.1.3 eq 80
access-list outside_in permit tcp any host 1.1.1.4 eq 80
access-list outside_in permit tcp any host 1.1.1.5 eq 80
access-group outside_in in interface outside

Done.

 

by: smartram78Posted on 2007-01-31 at 21:06:16ID: 18442076

try it out and let me know. It has worked for me.

ramesh

20120131-EE-VQP-002

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