Article View: comp.security.firewalls
Article #512Re: Incomin NAT Problem with FireWall-1
From: Olivier Merlin
Date: Tue, 05 Oct 1999 00:00
Date: Tue, 05 Oct 1999 00:00
79 lines
3637 bytes
3637 bytes
Hello Taoufik, well understood. Assuming that your NAT rules are correct, I think your problem relies on ARP. The fact that you are on the same network/subnet for your internal address and the NAT one, the router have nothing to do, your machine just try to resolve the NAT IP address to MAC address (ARP !). I have seen that you tried arp -s for a static arp, and I have done the same mistake myself at the beginning !!! Your solution (I hope) is in using the file "local.arp" of the \state subdirectory of your FW-1 (see the syntax in the manual for your OS, just create it if it doesn't exists): the goal is, for FW-1, to answer with its MAC address (the good side !), when someone tries to speak to the NAT address. FW-1 needs to be aware of that, and a simple arp -s is not the solution. You will need to fw stop/fw start if it seems not working. Just let me know. Best regards, Olivier Taoufik GABSI wrote: > Hello Olivier, > > My problem is that I have an internal use machine 192.168.150.50 (it can not > be sawn from the external network) and I want it to offer ONLY some HTTP > services to the extrnal network. > > So I wanted to configure may NAT like so: > all connection incoming to VALID_IP wil be translated to 192.168.150.50 at a > specific port. > AND > all connection incoming to VALID_IPZ wil be translated to 192.168.150.50 at > another specific port. > > Thats why I cant use the automatic translation rule. > > In the FW guides, it seems to be so easy to configure. > My Firewall logs say that the incoming packets have been translated to the > right machine on the right service, but my local machine does not see any > thing. > > Thank you for your help. > > Best regards, > > Taoufik GABSI. > > Olivier Merlin <omerlin98000@yahoo.com> wrote in message > news:37F8C5BD.DEF0FEAA@yahoo.com... > > Hello Taoufik, > > > > First of all, may I have some information on why and how you want to use > NAT in > > your configuration ? > > IE, do you plan to see your LocalMachine (192.168.150.50) on your side > with an > > "external" NAT address of (for instance) 192.168.160.12 (and try to > communicate > > from your LocalMachine2 192.168.160.50) ??? To be well understood( my > english is > > not perfect), 192.168.160.50 will try to speak with 192.168.160.12 (same > > network), and will go through NAT/FW-1 to your real 192.168.150.50 ? > > > > Second, have you checked the "automatically add translation rules" in your > FW-1 > > (with GUI) ? > > > > I think I have the good answer for you, but I just want to understand what > you > > are trying to do before... > > > > If you have already succeeded, just let me know ! > > > > Best regards, > > Olivier Merlin > >
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f922c,227863996b738b73 X-Google-Attributes: gidf922c,public X-Google-Thread: 110acc,227863996b738b73 X-Google-Attributes: gid110acc,public From: Olivier Merlin <omerlin98000@yahoo.com> Subject: Re: Incomin NAT Problem with FireWall-1 Date: 1999/10/05 Message-ID: <37F9BFD1.D7757F94@yahoo.com> X-Deja-AN: 532998731 Content-Transfer-Encoding: 7bit References: <7rr186$9md$1@arcturus.ciril.fr> <37F8C5BD.DEF0FEAA@yahoo.com> <7tc3h8$lqf$1@arcturus.ciril.fr> To: Taoufik GABSI <gabsi@inist.fr> X-Accept-Language: fr,en Content-Type: text/plain; charset=us-ascii X-Complaints-To: abuse@isdnet.net X-Trace: news4.isdnet.net 939114438 21866 195.78.1.77 (5 Oct 1999 09:07:18 GMT) Mime-Version: 1.0 NNTP-Posting-Date: 5 Oct 1999 09:07:18 GMT Newsgroups: comp.security.firewalls,fr.comp.securite