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Questions tagged [nat]

Network Address Translation, a technology used to translate a private IP address into a public IP.

Network Address Translation (NAT) is a method of connecting multiple computers to the Internet (or any other IP network) using one IP address.

NAT is also known as IP masquerading.

RFC 2663 - IP Network Address Translator (NAT) Terminology and Considerations

1164 questions
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How does NAT work for non-standard or uncommon protocols (or raw up)

For TCP and UDP NAT users port info. For other protocols like ICMP it can use protocol specific tricks. What happens if an IP protocol is used which isn't catered for or recognised? Can such a packet even leave the target interface? If so, what…
Andrew Parker
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Find out how many NATs exist between my home machine and the Internet

Are there any tools/utilities that can help me find out how many NATs exist between my home machine and the public Internet? Any references to protocols that would help me figure this out would also be useful.
sthustfo
  • 151
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How best to configure my Airport Extreme and uVerse Gateway to work together?

I have AT&T U-Verse internet service. I have their 2WIRE-manufactured wireless residential gateway (RG). It's an older one, with only 802.11g support. I have lots of devices, both wired and wireless: U-Verse DVR Wireless U-Verse receiver 2x Blu-Ray…
JakeRobb
  • 162
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How to find NAT responce port

Does NAT work as follows? My computer 192.168.1.5 sends a request on port:5555 (for example) this request goes to my router 194.564.23.67 (public ip) the NAT then changes the port and forwards the request and port and waits for response from target…
buill bogger
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I can't access URL on my own server, but others can

I have a server running webcams at 96.30.159.42:8081. If YOU click on this address you will see the 3 cameras I have set up. If I enter that address (or click on they hyperlink on my webpage), NOTHING happens. I don't get re-directed, no activity…
Bob
  • 29
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Port based routing, 1 public mapped to multiple private ips

Simply put, I want this single public ip mapped into different private ip's based on port 111.1.1.1:80 -> 192.168.1.1:80 111.1.1.1:443 -> 192.168.1.2:443 is this a standard and possible?
user1735120
  • 123
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Private to private network address translation

I need a black box that will translate 192.168.1.1 to 192.168.1.2. Can a NAT router do this? The problem that I am trying to solve: I have 2 devices with identical IPs of 192.168.1.1. The devices have dongles that fix their IP to this value. I need…
stephenb
  • 111
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Item's refresh in Port Address Translation Table

When does an item is removed from PAT Table? In TCP I would say it happens when connection is closed, but I'm actually not really sure. Does NAT Device know when a table's entry will never be used?
c.bear
  • 123
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1 answer

Which MPoA bridging protocol to use for delegating the public IP to an external router?

I have a DrayTek 130 VDSL2 modem, which uses PPPoA for connection. My ISP requires CHAP for authentication, but I am using an alternative OS on an external router, whose PPP plugin does not work as one would expect, thus having trouble with…
Tony
  • 69
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Do I really need a Static IP to fix my NAT type?

I have a NAT type of D on my Nintendo Switch that won't resolve regardless of my router settings. My fixed wireless ISP claims that this is because of a firewall on their end, and that I would need to buy a static IP in order to fix this issue. I…
user421241
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2 answers

How is NAT accessing the Transport Layer

When a router uses NAT to translate the destination IP/Port, it has to get the port from the TCP/UDP packet inside the IP packet, right? But what, if the TCP packet is encrypted?
coding4live
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1 answer

Accessing services from the external network

Does the ICMP request from the external host reach the server inside the private LAN ? if so , how the NAT router knows to which it has to forward the packet in the case of Port Address Translation (PAT) ,when no entry is there in the translation…
kathiravan
  • 11
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1 answer

What is Carrier Grade Nat (in human readable language!)?

I googled Carrier Grade NAT (CGN) and read some articles on Wikipedia and other websites, but I did not understand its difference with traditional CPE-NAT. Are CGN and CPE-NAT two totally different tools or CGN has some features (such as XLAT464,…
Alex Salig
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RV130 won't pass http unless behind another NAT

I'm attempting to replace a Linksys WRT54G with a Cisco RV130 for a home internet connection. For the moment, the setup is about as simple as it gets. Cable-modem -> RV130 -> Switch -> Multiple computers. Unfortunately, web traffic and just about…
Elros
  • 141
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1 answer

Offer IP to other end systems while behind router

Possible Duplicate: How can I make my home PC a web server? I am hosting a HTTP server on an end system that is behind a router. I want to offer my IP address so other people can access this HTTP server. Because of NAT however, I cannot just give…
codd
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