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04-25-2020 04:09 PM
Hello,
I need basic info. I am confused that large scale NAT. For example we have a single interface for ISP. There are 30,000 devices using Internet access simultaneously using NAT.Assume each device can have 5 connections to Internet open at any time. This would grater than TCP/UDP port lenght limit. In this situation, how to router (ISP router) behaves ?
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04-26-2020 10:28 AM - edited 04-26-2020 10:34 AM
Hello
If you have that of a large user base then one public nat address wouldn't be applicable you would use multiple public addressing in a NAT Pool and have users utilize those pool of public addresses in nat translation, With that many users you would also have resiliency and high availability so dual nat rtrs would be applicable incorporating something like B2B nat but the concept of dynamic nat pooling would be the same as below
example:
ip access-list 100 permit ip 10.1.0.0. 0.0.127.255 any
Ip nat pool PUBLIC 1.1.1.1 1.1.1.30 prefix-length 27
ip nat inside source list 100 pool PUBLIC
Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.
Kind Regards
Paul
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04-26-2020 05:05 AM
what router and model you are referring here.
First you need to start with Single Public IP with NAT configuration, when the X-Late and TCP multiplex full you get an error. I have worked environment there was no issue only for browsing, this may not be the case all the time. Depends on application.
you need to ask provider more IP address if the requirement is bigger. ( you need to Double NAT inside(i would not suggest, some application dont like it also).
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04-26-2020 10:28 AM - edited 04-26-2020 10:34 AM
Hello
If you have that of a large user base then one public nat address wouldn't be applicable you would use multiple public addressing in a NAT Pool and have users utilize those pool of public addresses in nat translation, With that many users you would also have resiliency and high availability so dual nat rtrs would be applicable incorporating something like B2B nat but the concept of dynamic nat pooling would be the same as below
example:
ip access-list 100 permit ip 10.1.0.0. 0.0.127.255 any
Ip nat pool PUBLIC 1.1.1.1 1.1.1.30 prefix-length 27
ip nat inside source list 100 pool PUBLIC
Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.
Kind Regards
Paul
