There are reason's to use each. Both NAT with an NVI and NAT "inside" "outside" have restrictions and each are better suited for certain situations. But both also have overlaping capabilities.
I recommend reviewing the information on univercd to understand the full feature benifits of each method and understand when each is best to use and also when it doesn't really matter which to use. You will find different restrictions with each method. "NVI is not a new way of doing NAT; it's a new feature to resolve NAT restriction." quoted from the cisco website. http://www.cisco.com/en/US/docs/ios/12_3t/12_3t14/feature/guide/gtnatvi.html#wp1027184 On Mon, Apr 14, 2008 at 3:08 PM, Roger <[EMAIL PROTECTED]> wrote: > Hi Ted, > > Nice to see that I'm not alone out there with my questions :o)) I hope that > a "NAT-Guru" could give us clarification. > > So, all the NAT-Experts out there, can you explain the real difference > between the "old style" and the "new-style" NAT with NVI? When to prefer > which solution? > > Thanks to all in advance > > Roger > > -----Ursprüngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von Ted Romer > Gesendet: Montag, 14. April 2008 21:02 > An: [email protected] > Betreff: Re: [OSL | CCIE_RS] IPEXPERT Lab 13 Section 2 General Nat question > > > Hi Roger, > > I'm also pretty curious about this one. Honestly, I've only used "ip nat > inside/outside". I noticed "ip nat enable" used a lot for solutions. I'm > curious if there are any gotchas around this or reasons for using one over > the other. > > Ted > > ----- Original Message ---- > From: Roger <[EMAIL PROTECTED]> > To: Louis S <[EMAIL PROTECTED]>; [email protected] > Sent: Monday, April 14, 2008 1:42:48 PM > Subject: Re: [OSL | CCIE_RS] IPEXPERT Lab 13 Section 2 General Nat question > > Hi Louis, > > I asked myself the same question, since I'm not very "NAT-experienced" :o) > Well, to me, the solution with the NVI is easier to configure. My problem > is, that for some questions, for example Task 13.21, still the old, "nat > inside..." command synthax is use. > So how can we differentiate, when to use which solution? > > Regards > > Roger > > -----Ursprüngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von Louis S > Gesendet: Montag, 14. April 2008 19:16 > An: [email protected] > Betreff: [OSL | CCIE_RS] IPEXPERT Lab 13 Section 2 General Nat question > > Hi all, > > I was hoping someone can explain to me what would be > the deciding factor that led the PG to use the > > "Configuring the NAT Virtual Interface" approach (see > hyperlink): > > http://www.cisco.com/en/US/docs/ios/12_4/ip_addr/configuration/guide/ntbaddr > s.html#wp1084652 > > as opposed to the older method in the "Configuring the > Inside Source Addresses" section of the same hyperlink > > > > > > ____________________________________________________________________________ > ________ > Be a better friend, newshound, and > know-it-all with Yahoo! Mobile. Try it now. > http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ > > > > ____________________________________________________________________________ > ________ > Be a better friend, newshound, and > know-it-all with Yahoo! Mobile. Try it now. > http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ > > -- Tyson Scott - CCIE #13513 R&S and Security Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: [EMAIL PROTECTED] Join our free online support and peer group communities: http://www.IPexpert.com/communities IPexpert - The Global Leader in Self-Study, Classroom-Based, Video On Demand and Audio Certification Training Tools for the Cisco CCIE R&S Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage Lab Certifications.
