Question

Internal IP address translation.

Asked by: MaherLimited

We need to redirect traffic from our internal network, for a specific IP address, back to an internal server.

E.g. Internal server 192.168.0.1, External IP 23.27.166.34.

Every time a host on our network (e.g 192.168.0.50) tries to access 23.27.166.34 on ports 993 and 587 it redirects to 192.168.0.1 on the same port.

We use a Cisco 3825 with CCME and have a fair understanding of the CLI.

Thanks

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Asked On
2008-08-28 at 04:00:14ID23685002
Tags

Cisco

,

CCME

,

3825

Topics

Cisco PIX Firewall

,

Network Routers

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: PeteLongPosted on 2008-08-28 at 05:16:50ID: 22333875

DOnt know how to do it for a specific port - but I'm guessing they are getting the "public" address via a DNS query?
so you could do it for all ports
if so just DNS doctor the response and the client will get sent to 192.168.0.50 instead

This is in the PIX TA? are you wanting to do this on a PIX/ASA or the router? (dont know if a router will DNS doctor)


 

by: lrmoorePosted on 2008-08-28 at 05:50:14ID: 22334142

Is the host using a fqdn url or straight IP address to access the host?
Is there a current nat inside statement for that public IP forwarding over to the internal IP?
If using fully qualified domain name, ie smail.yourcompany.com and that resolves to the public IP address, then you need to change how you do dns resolution internally and have internal users point to internal dns servers that resovles that name to the private 192.168.0.1 ip address.
There is no DNS doctor equivilent on the IOS router.
Else, I have completely misunderstood the purpose of the redirect..

 

by: MaherLimitedPosted on 2008-08-28 at 07:23:40ID: 22335186

Hi,

Thanks for the quick replies.  

We have PDAs that connect to our MS Exchange server using mail1.domain.com which works fine when people are out of the office.  What we want to do is give our users access to the internal WiFi network so that they can connect directly to the server and we can save on GPRS data transfer.  

The problem is that domain.com our external presence (website, email, VPN etc).  This then comes to our route and is NATed to the relevant server.  Our internal AD domain is external domainltd.com.  As a result, when the PDA's try to connect to mail1.domain.com using the WiFi they can't connect, as the DNS servers return 23.27.166.34.  What we want to do is make internal request for mail1.domain.com redirect to 192.168.0.1.  If its possible to add a DNS record onto the 3825 or use NAT etc.

The 3825 isn't actually a PIX firewall its a Cisco router with firewall capabilities, but I couldn't find a more appropriate zone to post the question.

Yes we the PDA's use the FQDN

I have tried adding DNS entries on our W2K DNS servers for domain.com, however, that then meant that we were unable to access our website which is hosted externally.

I hope that clarifies our requirements.

 

by: MaherLimitedPosted on 2008-08-29 at 07:54:59ID: 22346060

Hi,

Do you require any further information?

 

by: MaherLimitedPosted on 2008-08-29 at 09:02:49ID: 22346833

Would it be possible to use a command such as:

ip nat inside source static tcp 23.27.166.34 993 192.168.0.1 993 route-map SDM_RMAP_1 extendable
ip nat inside source static tcp 23.27.166.34 587 192.168.0.1 587 route-map SDM_RMAP_1 extendable

 

by: PeteLongPosted on 2008-08-29 at 11:18:50ID: 22347927

if the clients are on wifi - and are getting leased your internal DNS servers why not simply create a forward lookup zone for mail1.domain.com that returns the private exchange address - then all this becomes a moot point?

 

by: MaherLimitedPosted on 2008-09-01 at 01:11:01ID: 22358188

I tried this and it did work, however, we are then unable to access our website www.domain.com.  I was going to put a DNS entry in for our website to get arround this, although our website doesn't have a static IP address.

 

by: MaherLimitedPosted on 2009-10-13 at 01:41:41ID: 31491048

Partially complete solution.

20120131-EE-VQP-002

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