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Author
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Topic: Configure NAT
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pllim
Jr Member
Member # 11168
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posted September 21, 2005 04:55 AM
I have a Cisco 2621 router running 12.1 IOS. I'm trying to setup NAT with a registered global IP address. Using the same global IP address, I would like to -
1. Allow outside Internet users to access to my internal web server (IP 10.30.2.36) using port 80.
2. Allow outside Internet users to access to my internal Linksys Phone Adapter (IP 10.30.1.201) which requires port 5060 to 5070 and port 10000 to 30000.
Is this scenario possible?
Thanks in advance.
Posts: 14 | From: KL, Malaysia | Registered: Mar 2004
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JP Eikeland
Brainiac
Member # 15238
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posted September 22, 2005 02:43 AM
Hi ,
I did a similar scenarion a year ago, setting up a infrastructure for a SIP infrastructure. So yes, it is posible. I used the PIX to do the natting but that would be the same. SIP protocol can live with nat althogh it is prefered to use a public ip address to the SIP server. If you need any more help, just let me know..
Jens P
Posts: 577 | From: Norway | Registered: Mar 2005
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pllim
Jr Member
Member # 11168
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posted September 22, 2005 03:00 AM
After some trials and errors, I manage to find a solution. I created 2 static NAT entries into my router.
- problem solved -
Posts: 14 | From: KL, Malaysia | Registered: Mar 2004
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pllim
Jr Member
Member # 11168
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posted September 22, 2005 03:08 AM
The thing which I am puzzle about is Linksys uses SIP and Cisco NAT support for SIP was introduced beginning from IOS version 12.2 (8)T. (See document titled "NAT Support for SIP" in Cisco website)
My Cisco router is using version 12.1(1).
So, why did my NAT work?
Posts: 14 | From: KL, Malaysia | Registered: Mar 2004
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happs
Elite
Member # 15802
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posted September 22, 2005 07:40 AM
im not sure, but i think this doc you are referring to "NAT Support for SIP" is actually "NAT Support for SIP on non-standard port", SIP can be configured with NAT just like you have with old IOS version, on standard port(s), i would like someone to please correct me if i got this wrong, thanks
"NAT listens on the default port of the SIP Proxy/UA server to translate the SIP messages. If the SIP Proxy/UA uses a port other than the default port, that port needs to be configured using the ip nat service sip command".
Posts: 329 | From: KHI-PK/RUH-K.S.A | Registered: Apr 2005
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JP Eikeland
Brainiac
Member # 15238
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posted September 22, 2005 10:54 AM
yea... happs is right, and SIP is in fact a very nat friendly protocol compared to many others.
Jens P
Posts: 577 | From: Norway | Registered: Mar 2005
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