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About Tejas Natu
Expertise
I can answer all questions for the following topics: Lan Design, Isdn configuration, Frame-Relay, Routing & switching, Vlan Configuration,OSI model,Tcp/Ip,Subnetting

Experience
Over 4 and a half years experience in the IT industry, worked in various roles such as Network Engineer, Technical Support Team Leader, Voice and Datacom Team Manager. Currently working as a Network Design Consultant for a ISO certified & SEI-CMMI Level 5 company.
 
   

You are here:  Experts > Computing/Technology > Communications/Networks > General Networking/Lan/Wan > ip nat inside source command issue

Topic: General Networking/Lan/Wan



Expert: Tejas Natu
Date: 7/17/2008
Subject: ip nat inside source command issue

Question
QUESTION: Hello,
i'm trying to enter the following commands in my cisco router's configuration but when i enter them and issuing afterwards the "sh run" to see the results only one of the two commands is present - the other is absent and i cannot figure out the reason this happens. The commands are the following :


ip nat inside source static tcp 192.168.1.2 5900 interface Dialer0 5900
ip nat inside source static tcp 192.168.1.33 5900 interface Dialer0 5900


Why is the router is acting so strangely ? I checked the memory usage of it and there is no problem - there is enough room. What i'm i doing wrong ? I'm looking forward ASAP for your answer.
Router : Cisco 861 ADSL/over ISDN   IOS VERSION 12.4. Configured for VPN usage


Thanks in advance.


ANSWER: Hello,

Only one internal IP address can be statically mapped to an outside dialer IP address, to have two static mappings, you need two different outside IP addresses.

Regards,
Tejas Natu

---------- FOLLOW-UP ----------

QUESTION: Hello again,

is there any way to overcome the issue if just only one outside dialer IP address exist ?



Thank you.  

Answer
Hello,

You can statically map 2 internal IP addresses to just one external IP address if some parameters differ, such as the port number or the protocol. If these are the same, then you need to have 2 external IP address to have static mappings.

Else you need to configure dynamic NAT.

Regards,
Tejas Natu

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