Questions tagged [nat]

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

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IPTables NAT Prerouting not working

I am trying to use IPTables NAT to reroute a request to myip:3240 to an ip from an OpenVPN client, 10.8.0.8:3240. The command I am using is iptables -t nat -A PREROUTING -d 192.99.154.95 -p tcp --...
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VPN connection to Unifi USG Pro 4 using L2TP/IPSEC does not work behind my ISP's router

I have my ISP's router in my home which gives out 192.168.0.x addresses. I also have a USG with which i want to create a separate network, that i can reach using VPN with L2TP/IPSEC. This should be ...
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non-NAT'd ip to firewall

My firewall appliance requires a non-NAT'd ip address and 4G is my only option. What is the difference between a 4G router that uses a sim card vs one where I connect a phone and select usb tethering ...
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How does a cloud NAS manage to be accessed from the outside of a LAN through an app?

I have a cloud NAS within my home network and I can't figure out how it manages to be accessed from the outside through an app. How does the app always know at what address requests should be sent, ...
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SSH from one VM to anther keeps failing - under same NAT network

I've set up two vm running on same virtualbox host, they are working under same NAT Network and each has grained an IP. Their network setting looks like: In order to make SSH works, I've followed ...
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cannot use sftp in case of usb tethering (NAT)

Summary: I'm trying to connect from my laptop to my Desktop to transfer files using sftp username@localIP but it gives me connection timeout Case: Both machines are using Linux and connected to the ...
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how can I implement nat in Linux now?

I used to be able to do it with iproute2 (ip rule and ip route), but it's been deprecated. I now found tc-nat. From the man-page: tc ... action nat DIRECTION OLD NEW However, when using it: ...
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When multiple client hosts are behind a NAT sharing one 'external' IP address, how do multiple clients to connect concurrently to the same address?

According to a related post it is not possible for port forwarding to concurrently serve multiple client hosts that are using the same internet service/application/protocol(eg. FTP, HTTP, etc) as each ...
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Different ISPs with Bridged Mode and PPPoE

I have a passive FTTH connection at home, which is connected to an optical media converter and then to a D-Link DIR-615 router. The ISP has given me PPPoE credentials, using which I connect to the ...
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Does the software-firewall of a virtual machines host also protect the guests?

Both: host & guest are running windows 10. I use VMware for virtualization. The guest VM connects to the internet via NAT. I have a service running on the guest VM which I can access from the ...
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Firewall with NAT, Do I Need A Router?

I have a home lab that is behind a Juniper NS-50 firewall. I can reach the firewall's admin page from a laptop (on the trusted LAN), but I can't get the servers within the (trusted) lab to communicate ...
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Am i right with the assumption that basically every time we see “NAT” being used for SOHO environments, its actually PAT?

I am just a bit confused because on the one hand i thought that i have good knowledge and that what we know as NAT is mostly PAT. On the other hand, i see the term NAT being used for the same ...
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Nat network request to itself not working

I have a proxmox server with one public IP. I have setup up NAT and iptables to forward port 80 and 443 to my apache2 server. Everything is working fine until I try to make a request from inside the ...
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How is security ensured in Port Forwarding

I was reading this to understand Port Forwarding and what it is used for. Though the thread very clearly explains what Port Forwarding is, wouldn't setting up a port on the router to forward all the ...
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Is it possible to make P2P applications work behind CGNATs?

I've been thinking about making a pure-blooded P2P communication system, without any servers in the middle. Made a prototype on sockets that works locally. But then it turned out that my provider ...
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Weird ISP setup: Static ip behind carrier-grade NAT

I'm new to "ISP level" networking so this question might be a bit naive. I've been having weird network issues in linux machines. As a debug/learning initiative, I decided to try and replace my ISP ...
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Is a NAT Punch through the NAT Loopback possible?

Lets say three devices behind the same NAT. A server, two clients. The clients send packages to the server through a port forward in the router and receive the socket-adresses of each other as a ...
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Cannot set home web server for universal access

I was trying to set up a home web server for universal access on port 80. I disabled the firewall to and set up port forwarding on the router correctly. When I tried to reach my server outside of ...
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Home router difficult to access remotely

I've been trying to debug this problem for a week or two now, and haven't been able to figure out what the issue is/if there's anything I can do to resolve it. I have a home Xfinity router that's ...
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How do I change the source IP of NAT-locally forwarded packets to the public IP of the forwarding router?

I have a typical consumer router(netgear) running DD-WRT. It has port forwarding set up to a server in the private network. I can send UDP-packets to that server, by using the public ip/DDNS address ...
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Allow Traffice between two VPN AnyConnect users (Ping, RDP, etc..)

How I can establish a connection between VPN clients? I would need someone to explain this by example. I could not see any clear reference to this subject
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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?
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Why do I sometimes get a traceroute that makes four internal LAN hops before reaching the WAN?

Why am I getting both 10.x.x.x and 192.168.x.x internal IPs each time I tracert? I am using a Hitron CGNM modem/router combo provided from my ISP. If I run a tracert I get something like: 1 20 ...
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Some doubts about Destination NAT

I am kind of a noob when it comes to computer networking. I have been studying NAT for a while, but I am having a hard time trying to figure out what exactly Destination NAT does in some circumstances....
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Trying to run a local server with port forwarding behind a carrier grade network from ISP, but getting no connection with localhost

i'm trying to make a half life server by portforwarding trought my router. It didn't work, i checked it out, and my public IP and my WAN IP were different, then i realised that i was in a carrier ...
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Access VPN hosts from another PC in a local network

In my local network I have two machines PC Linux - 192.168.1.11 Laptop Windows - 192.168.1.12 The machines are already reachable inside local network, subnets and firewalls are configured properly. ...
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Switching a VM to/from LAN when Cisco AnyConnect is disconnected/reconnected

Question Here is my current setup (refer to the diagram below): Within my local LAN, call that LAN1, I have a Windows 10 Enterprise laptop called host2. Within host2 I have running VMware Workstation ...
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Noticing common public IP address across all devices

I have googled what is my ip address from my laptop and got 103.92.123.196. Doing the same from my Raspberry Pi and from my phone, I got the same public IP address. Doing a speedtest on all 3 devices,...
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Ubuntu Server - “Virtual” Network Interface with Internet Access

I have an Ubuntu 18.04 server with one public network interface (eth0). I'm trying to create additional "virtual" network interfaces that will also be able to access the internet with NAT rules set up....
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Cannot forward/nat traffic to vboxnet

We have a guest vagrant/virtualbox machine (ip 192.168.50.10) inside a host (ip 192.168.50.1 and two interfaces, the second one with public ip 104.x.x.x). On the host, we want to forward traffic ...
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Local computer and remote computer are behind NAT. How to make local network accessible with SOCKS?

I have a Local computer (behind NAT). An intermediate server which is publicly accessible and has a fixed IP address. Remote computer (behind NAT and not the same as local computer). I’d like to ...
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Ubuntu Firewall to Sophos xg210 Firewall

I've inherited an Old linux/IP tables Firewall, along with a new Sophos xg210. I'm not very proficient at Linux or the commands that I need to use to view everything that I need, however I need to ...
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How to fix Symmetric NAT Router Router?

I am trying to host game on game ranger , it gives me the following message: Your internet connection is behind a Symmetric NAT Modem/Router that will prevent you from hosting all games, and from ...
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Host names behind NAT

First of all I want to apologize if this is a little bit silly, but I'm getting old.. My topology is as follows: Internet (I) <-> Router (R) <-> Host (H) I bought a domain (have a real IP as ...
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IP forwarding and masquerading not working

I have a Ubuntu based VM with one interface ens4. I would like to use it for IP forwarding and masquerading. The aim is to make sure that if a request is made to 10.238.232.19:443 on the interface ...
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Setting up DNS server behind NAT

I have a CentOS 7 server sitting on my home network. I running Plesk to perform server management. Everything works fine, I have some port forwarding rules set as well as Firewall. The only issue I ...
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I would like to know how not to have a doubleNAT while using my aftermarket router for WiFi

Basically what I want to know is the following; I have an arris router/modem which i have the Wifi disabled and the Asus rt-ac88u connected to it broadcasting Wifi, I have the Arris running in "...
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Bridging a Linux VPN client's VPN to a video game console

I have a Nintendo Switch that can't play multiplayer games despite reporting NAT Type B. It worked until I switched to an ISP that can't provide a static IP or port forwarding. I can't switch ISPs. So,...
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Why do I need to use port forwarding to be able to access SFTP on my VM?

I'm using Debian on a Virtualbox VM, the default network mode is NAT which according to the Virtualbox documentation is "the simplest way of accessing an external network from a virtual machine. ...
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Nftables DNAT doesn't seem to be working

I am trying to setup a DNAT on my new centos 8 using nftables. This utility (and centos 8) is new to me, I've been using iptables (centos through 6) for ages. My assumption is that I did not setup ...
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How do ports work through NAT? [duplicate]

i can't quite word it in the tutorial, but this is what I'm talking about Public IP: 10.0.0.1 Private IPs 192.168.0.1, 192.168.0.2 and 192.168.0.3 connect to argos.com google.com and ebay.com through ...
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Does a Router use NAT to assign it's own IP to the packet and then the use PAT to figure out where to send the response?

Does a router use NAT when receiving a packet from a private IP:PORT to change the source IP on the packet to its own public IP and then when it receives the response packet back, use PAT and the PORT ...
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Public IP, access from router to modem

I have a network structure based in the following way: PC ------------ ROUTER ------------ MODEM ------------ INTERNET I´ve set up a public ip in modem, and I need to access it from the PC, how ...
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How do I correctly configure a wireless router that's connected to an ONT?

My physical network setup is like this: Fibre Optics from ISP > Splitter > PON Connector > ONT > From LAN1 of ONT to WAN on Wireless Router> Via Wi-Fi my other devices are connected My ONT Model: TP-...
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DNS and Web Local Servers and NAT

I'm doing a scenario about DNS and NAT in Packet Tracer: As shown in the image, I write a default route and NAT on Router1. I want to request www.apfz.ir from the PC1 browser through the Internet or ...
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DDWRT access IP over NAT

I have Wi-Fi router with DDWRT and a fileserver over router's NAT. How can I access a fileserver from the router's subnet ? A computer is connected to a Wi-Fi router its IP starts with 192, Wi-Fi ...
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Reverse proxy with upstreams behind NAT

Scenario Multiple IoT devices, owned by different customers, running behind different NAT LANs. Customers wanting to remotely access their IoT devices. IoT devices have an onboard hand-rolled web ...
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119 views

Two IP cameras cannot be present on a network at the same time

I have two IP cameras with Ethernet connectivity (TV-IP313PI from TrendNet). The cameras are identical models and have unique MAC addresses. The two cameras are connected to an unmanaged Industrial ...
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Not able to do port forwarding in a home router configured with a static IP type connection

I have a typical home internet connection with a wireless router which broadcasts a wireless signal for all the home devices to connect. Recently I started using Linux and I heard about the idea of ...
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Do routers necessarily conceal mac addresses?

According to this answer, routers can conceal multiple devices before an ISP and make it look as if there is only one device (the router), with one mac address (just only the router's mac address!) ...

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