Firewall Wizards mailing list archives
Re: Pix 501 configuration question
From: "Victor B. Williams" <vbwilliams () essvote net>
Date: Fri, 7 Nov 2003 11:45:19 -0600 (CST)
I think the question we're all going to ask is... Why in the world would you want to do something like this? There's no rhyme or reason why you would want internal people connecting to an external IP address of a machine that already has an internal address on your network...and quite frankly, I don't think you can do that anyway. If the point of the exercise is to access the machine by domain name--whether inside the network or outside--then you need to use a split dns setup...and that has nothing to do with the firewall. That's something that is isolated to your DNS setup. If you're using BIND 8 or later, it's pretty straightforward...consult the Oreilly BIND and DNS book. If your DNS is Windows, I can't help you there. Adam Lang said:
This is probably an extremely basic question for this forum, but in an hour of looking I haven't found a better forum to ask in, except paying multiple hundreds of dollars to call up Cisco and ask them. I'm a total firewall newbie, and have just set up my first one for my company, a Pix 501. I think I did a fairly good job of it, all things considered, but there's one thing that I just can't figure out. A secondary company web server is behind the firewall, as are our secondary DNS and two publicly available WebDAV servers. These machines have been given one-to-one NAT... 123.456.789.195 maps to 192.168.1.195, for example, for the web server. This works fine from the outside... anyone can connect to 123.456.789.195 on the web port (and can't connect on any other port). And from the inside, of course, anyone can connect to 192.168.1.195 on any port. However, I want my fellow employees to be able to connect to 123.456.789.195 from INSIDE the firewall. Hacks like the name-server-substitution stuff (where the Pix substitutes 192.168.1.195 for the 'real' address when the lookup passes through the firewall) are just not going to cut it. Is this possible? Why doesn't it work in the first place... is there something inherently insecure about allowing people from inside to connect to an inside machine's external ip? The pix is 123.456.789.195, and I can't imagine why it can't talk to itself. Do I need to set up some sort of default routing? Do I need to somehow make a rule translating 123.456.789.195 to 192.168.1.195 on the inside, even though the setup tool doesn't appear to allow you to do that? (Maybe I need to do it from the command line?) Do I need to ditch the Pix because it just can't do this? (Please say no.) Thanks in advance for your help. --Adam Lang _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards
"Real men don't even use monitors! I've just got a guy that can draw real fast." Victor Williams Network Architect Election Systems & Software http://www.essvote.com vbwilliams () essvote net (402) 970-1100 CONFIDENTIALITY NOTICE: This e-mail transmission and any documents, files or previous e-mail messages attached to it may contain information that is confidential, protected by the attorney/client or other privileges, and may constitute non-public information. It is intended to be conveyed only to the designated recipient(s) named above. Any unauthorized use, reproduction, forwarding, distribution or other dissemination of this transmission is strictly prohibited and may be unlawful. If you are not an intended recipient of this e-mail transmission, please notify the sender by return e-mail and permanently delete any record of this transmission. Your cooperation is appreciated. _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards
Current thread:
- Pix 501 configuration question Adam Lang (Nov 07)
- Re: Pix 501 configuration question Victor B. Williams (Nov 09)
- Re: Pix 501 configuration question Mikael Olsson (Nov 09)
- RE: Pix 501 configuration question Josh Welch (Nov 10)
- <Possible follow-ups>
- RE: Pix 501 configuration question Steven A. Fletcher (Nov 10)
- RE: Pix 501 configuration question Melson, Paul (Nov 10)
- Re: Pix 501 configuration question David West (Nov 11)