Question

Need lines for PIX 515e - forward inbound requests to server on LAN

Asked by: michaelgoldsmith

I have a web development PC on our LAN. I would like to configure my firewall so that inbound traffic pointing to 155.212.41.18 passes through the firewall to 192.168.1.86.

Details:
IP: 155.212.41.18
SM: 255.255.255.252
DG: 155.212.41.17

This IP address is NOT part of our normal block of 5. It is an extra IP address that was assigned to us on a different subnet with a different gateway. I have been told that it has been bound to our T1 router.

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Asked On
2009-08-24 at 07:13:41ID24676566
Tags

cisco

,

pix 515e

,

command lines

,

port forward

Topic

Cisco PIX Firewall

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: ChristianTPosted on 2009-08-24 at 08:28:47ID: 25169323

I'm not sure this is going to work for you.  You said the new address is assigned to your router.  Do you know which interface of the router it is assigned to?  Do you manage your router or is it managed for you by your ISP?  
I think what you will find is that you will need a separate firewall for that new IP address since it is in a different network from your existing block of 5.  The PIX is only capable of handling one IP subnet on the outside interface, and in the scenario you are explaining, you would be putting two subnets on the outside interface.
Answer the questions I asked above and I might be able to give you a more precise answer.

 

by: mlnetopsPosted on 2009-08-24 at 08:35:53ID: 25169386

So if I understand this correctly, 155.212.41.18 is the publicly assigned address that you will be using for the web development PC?

If this is the case, then you will need to configure NAT on the PIX so that all requests to 155.212.41.18 will be translated to the private IP address 192.168.1.86.

To do this:

1. PIX(config)# static (<interface where the development PC is located>,<outside_interface>) <public IP address> <private IP address> netmask 255.255.255.255

example: PIX(config)# static (inside,outside) 155.212.41.18 192.168.1.86 netmask 255.255.255.255

2. Make sure that you have routes to get to the internal PC configured on the PIX.

3. Make sure you have access rules to allow traffic from the outside to get to the internal PC.
example:
access-list 101 line 10 remark [Allow HTTP traffic to Web Development PC]:
access-list 101 line 11 remark ====================================
access-list 101 line 12 permit tcp any host 155.212.41.18 eq 80

Let me know if I understood your question correctly and if I answered it completely.

 

by: michaelgoldsmithPosted on 2009-08-24 at 08:37:25ID: 25169401

The Adtran router that bridges our existing T1 lines is managed by the ISP (Conversent/One Communications). The extra IP address has been bound to this device.

We manage our PIX 515e router/firewall. Since we are already using the 5 IP's in our block, we were assigned this extra IP address for the purpose of web development testing.

 

by: mlnetopsPosted on 2009-08-24 at 08:41:23ID: 25169443

Ahh.....after reading over your question again, Christian is correct. Unless you have another interface that you can configure on the PIX, this will not work for you.

If you do have another interface on the PIX, then you can configure it so that it is part of the 155.212.41.18 network, and then configure NAT, routes, and access rules to allow the traffic to pass to the internal PC.

 

by: michaelgoldsmithPosted on 2009-08-24 at 08:46:00ID: 25169487

We have a second interface, but it's already configured as a DMZ for routing to a remote network.

Possible solution? I have an 8-port switch in between the AdTran and the firewall. Can I purchase a cheap router to put on the switch and then plug the web server into the router and port forward to the web server?

 

by: ChristianTPosted on 2009-08-24 at 08:52:27ID: 25169554

Even with a second interface on the PIX it won't work because you would need two default routes, and the PIX can't do that.

The cheap router path is exactly what you will need to do.  155.212.41.18 will be the address on the router's outside interface I think and 155.212.41.17 will be the gateway.  Then, give the router's inside interface an address on your internal network and point your dev server at that address for it's default gateway.

 

by: ChristianTPosted on 2009-08-24 at 08:56:58ID: 25169609

The more secure way to do this would be to put the dev server in your DMZ (still using the router setup I described above) that way if your dev server gets hacked, it will be harder for the hackers to compromise the rest of your network.  This setup would require a static route on the dev server telling it how to get back to your internal network via the PIX.

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