Questions tagged [nat]

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

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How can I set up a layer 3 bridge using Proxy ARP such that http requests can be made to the inside hosts IP successfully?

Currently I am using a Raspberry Pi to bridge an ethernet connected printer to wireless internet and have used DNAT successfully to give the printer internet access, manually forwarding the printer's ...
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Rerouting all traffics from one interface to another

I'm using linux. I have a device connected to the ethernet interface on my motherboard (enp0s31f6) and my PC has a wireless card (wlp5s0) which is connected to the router . The device is sending DHCP ...
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NAT style port forwarding on Windows

I would like to know, is it possible to implement NAT style port forwarding on Windows? Native (included with the OS) solution is preferred, but third party tool would be fine too. Let's say, I want ...
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NAT: Getting no route to host error from private network but ping is working

I have two networks configured, one with 10.10.0.x (netmask: 255.255.255.0) this network is internet facing via gateway (10.10.0.1) and the other private network with ip range in 192.168.0.x (netmask ...
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Iptables: route ntp requests from lan to internal vpn server

i have to following config client gw with openvpn ntp server 192.168.10.82 ----> eth0 192.168.10.1 - tun0 10.8.0.46 ---> 10.8.0.1 where i can't install ...
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BitDefender firewall: allow single IP instead of a range

I want to allow a single IP within my LAN to be able to connect to my guest server which runs on a host with NAT networking in virtualbox. I configured port forwarding in virtualbox to pass the ...
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How does the router not have conflicts with other devices as it is using the same public IP address? (NAT)

So I've been learning about NAT and how it allows us to reuse IPv4 addresses by using a NAT table and having basically an alias for the private IP to a public IP and vice versa along with storing the ...
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PfSense NAT not working with bell fibre

New to Pfsense and have been stuck on an issue where I can't get the NAT to work. Let me give some back story. Before, we had the following setup, a bell modem/router set to bridge mode connected to a ...
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Double NAT port forwarding with pfSense and subnet - Is it safe?

I would like to expose an application server (virtual machine) to the internet for developing/learning purposes. I cannot physically separate my main home network from my server lab. My hypervisor is ...
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Establish connection through multiple hops

I have a set-up as shown in this figure. set-up How do I establish connection(TCP,Ping etc...) between Laptop-1 and laptop-4. I have background in physical layer of wireless, but not much aware of ...
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ddwrt behind dsl router

so at my parents in law house i have no access to log or configure the main dsl gateway/router he says he dosent know the login information. sometimes we get crappy internet and there is no way i know ...
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Connecting Multiple Subnets to Internet

I have this Cisco DPC3941B Modem/Router connected to a Wireless Nighthawk Router which then connects to my Layer 3 Switch. On that switch I have subnets of 192.168.70.0/24 and 192.168.80.0/24. When I ...
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network setting automatically switched to Bridged in VMWare Player

I was trying to setup a lab environment for Vulnhub box. I ran both Kali VM and Kioptrix level 1 VM on VMWare Workstation Player. I heard that I should set the network adaptor of both VMs using NAT or ...
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How does NAT know where to transfer the first incoming packet? [duplicate]

Say me and another identical computer are together in a local network (I am 192.168.1.5 or A, and he is 192.168.1.6 or B, for example) behind NAT (say our public IP is 5.5.5.5), and we have a torrent ...
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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 ...
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How to connect 12 devices with identical IPs on a single network when device IPs can't be changed?

I have a customer who has 12 PLCs (Programmable Controllers) on his shop-floor. All these PLCs have identical IPs, and cannot be changed for some reason. My task is to access information from all ...
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Webhosting on a “Double NAT” network behind Altice One Gateway

I have a home network with a small web-server hosted behind a LAN-WAN cascaded router. The port forwarding rules on my Altice One router point traffic on port 8080 to my cascaded routers port 8080 ...
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Terminate or bust natted connection

I have a problem with natted connection on linux. I'm using Debian 10, and iptables to do some SNAT to force all my packets outgoing from eth0 to a specific UDP port to use a specific IP attached to ...
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How does NAT convert a public IP address to a private IP address?

Lets say that someone on the internet wants to send me a message (not a response) and my phone has a private IP address (and my router has a public IP address). Since my router shares its public IP ...
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TCP Port Redirection through Firewall

I have two Win10 computers behind firewalls and access to a linux server if needed. I'm trying to get computer A (my computer) to be able to access computer B's network. I know the entire network ...
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Is it possible to port forward traffic from VPN server to one of clients?

I'm having a problem with NAT type in one of games. I cannot port forward my home network cause ISP blocks any traffic anyway, so the only solution would be to have a VPN server of mine. Everything ...
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How can I forward all traffic from one of a VPS's 2 IPs to my home computer using Wireguard?

I am trying to wean myself off the big companies, and would like to get a home server up and running with Nextcloud and a mail server. I know how to use dynamic DNS and whatnot, but for mail you need ...
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Port forwarding and NAT using pf on freebsd

I have a network router that connects three networks with the outside world. One of the internal networks is public facing the other two are not and connected via NAT. I am part of a larger network ...
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Am I doing anything wrong with my double NAT?

I have added two routers in double NAT configuration, in order to protect my inner network from some risky devices that exist on my outer network (the private network of my internet-facing router). (...
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SSH file transfers slow with lots of TCP retransmissions

Good evening, I use SFTP (File Transfer over SSH) from a computer (Windows 10) to a Synology NAS. Both devices are behind NAT on different locations. Around 3 weeks ago, whenever I initiated a ...
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Virtualbox: Use Guest VPN in Host

I have a Win10 guest machine running in VirtualBox on a NixOS (Linux) machine. The Win10 guest is connected to a VPN. How can I share this VPN connection with the host such that I can visit IPs from ...
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Port forwarding: Modem -> Router -> AP -> Server

Attached is my network diagram. I have a Modem -> Router -> AP -> Server setup and want to forward port 443 through them. I have tried 3 configurations in the IP > Firewall > NAT but ...
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Setup MikroTik Hap AC to work with fiber internet

I got new ISP few days ago, and it's fiber line that according to ISP I can use with my MikroTik router. In mail I got the following (made up IP, but same pattern): WAN block 93.83.73.68/30 ISP port: ...
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ASA 5515 (9,5) FTP authenticating but not passing trafffic

Very simple setup for short term contractor access ASA with 2 interface inside(192...) and out (164.135..) just one server with ip 192... address directly connected to internal int of ASA . no ...
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Playing Call of Duty online using Socks5 proxy

My ISP don't assign public IP hence I can't use port forwarding to change NAT from 'Strict'. I've a private virtual server having static public IP and I've setup socks5 server there that works best ...
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how to get a non NAT ip in Win 10

When ever I connect my internet thorough usb tethering or wifi hotspot or my router's wifi and check my ip through ipconfig, it always shows natted (NAT - network address translation) ip (192.168.xxx....
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Poor Wireguard Performance using Mobile Data

I've setup a Wireguard server (running on Ubuntu server 20.10 (ASRock J4105), plugged directly into the router). I've managed to get it working after some difficulty actually getting access to the ...
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Port forwarding from VPN server to server's non-VPN neighbor

I have a server with OpenVPN server installed and the service is exposed to the internet through Port Forwarding on my router. I have a device on my internal subnet that provides a webpage that I wish ...
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Same port for 2 VM behind NAT via Virtual Network Editor

I have two VMs behind NAT. For the first VM through the Virtual Network Editor, I specified port 443. Now for the second VM I would like to do the same, but I cannot. What can I do to make both VMs ...
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How to be able to use global IP in the local network?

Let's say we have: 192.168.0.1 router connected to internet with global IP 1.2.3.4 192.168.0.10 machine A with a web server serving on port 80 192.168.0.20 machine B (laptop) The router is ...
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Routing/NAT Linux how to (RHEL 7)

I have a device (called TANGO) with an IP address of 192.168.1.2 netmask 255.255.255.0 connected directly using GbE Link to a RHEL 7 server (called LIBRA), where I assigned a static IP on LIBRA GbE ...
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iptables not filtering after applying rules to KVM based virtual machine

I am following this serverfault post as I want the guest Centos7 Virtual Machine to access the internet but have no access to any LAN network. My Host machine is Red Hat 7. Here is the output of ...
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Route the traffic through other system

Im fairly new with this. I wondering if i have 3 systems linux (e.g system A, system B and system C) and i want to redirect all the traffic through the system B, it may be looks like this: System A &...
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Setting up portforwarding for server behind NAT

With one of those "consumer VPN" like Privateinternetaccess, that have portforwarding is it possible to do the following: Set up a server on a network behind a NAT and use portforwarding so ...
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I want to connect to a printer through MikroTik NAT

A Wi-Fi printer is connected to the private network (192.168.2.xxx) on ISP's GPON, which has both Wi-Fi and Ethernet connections. An Ethernet cable from GPON then goes into a MikroTik router in my ...
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Port forwarding not working with iptables

I use a CentOS 7 as a gateway server. It has two network interfaces, ens28 and ens29. The ens28 uses a private 192.168.x.x network, it is considered as the WAN. Ens29 is the LAN area with a 172.16.0.0 ...
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Windows 10 perform masquerading NAT on routed traffic?

I'm trying to route internet traffic into a VPN running inside Windows 10 (Enterprise, 20H2) and do NAT (IP masquerading). Here's my setup: Host: Linux server, eth0 is public-facing and virbr0 is the ...
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TFTP reply with port not 69 can't go through NAT

I had an Ubuntu laptop which I configured as a router. The topology looks like: internet <---> laptop router <---> raspberry pi 3 NAT is enabled in the laptop to forward packets from ...
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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 ...
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Any low cost solution for using Windows as home NAT router?

Long story short: I need to replace a D-Link home router with Windows PC for some reason. How can do it without paying $500 for a Windows Server license? Full story: I've been a Linux & Mac user ...
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Port forwarding / Hair pinning

I have a server that unable to access external IP Addresses when connected to LAN. For example External Ip Address: 108.111.111.222 Internal Ip Address. 192.168.1.100 When connected to the same ...
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Port Forwarding and Firewall issues from public IP to VPN network

WAN VPN |--------------| |-------------------------| |------------| | Web Client | <----> | Cloud Server | <----> | Rpi |...
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Dynamic DNS and URL really slow to load from the internal network

I have a Docker Nextcloud instance running on my PC where I configured it in a way that the application server running upon it points to https://myid.duckdns.org:1234. Of course the duckdns.org client ...
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How to keep lxc guests in an invisible private network (unreachable from outside)

On a [pretty much] fresh Ubuntu 16.04 server installation, I set up one lxc guest. On the host, lxcbr0 is 10.0.3.1, and the host's public interface is enp0s3, while the guest is, say, 10.0.3.16. I ...
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Routing between network adapters on Windows Enterprise

I have 2 network adapters, one is "Mobile Broadcast Network" (10.123.1.23) and the other is LAN (192.168.1.1). I need to give the LAN adapter access to the cellular internet and I've tried ...

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