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

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What is: Keep port forwarding of the Internet router enabled for telephony

When using a fritzbox with attached phones in bridge mode behind another router, manufacturer avm suggests to enable the option Keep port forwarding of the Internet router enabled for telephony, ...
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76 views

How does a NAT router obtain its IP address?

I have a question about DHCP and NAT. I know NAT translates local IP addresses and ports into a single IP address and specific ports that can be used to communicate with the Internet. I also know ...
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69 views

Is “One-to-One NAT” works in one direction only

I have created One-to-One NAT rule in my home DSLmodem/router, in order to allow a locally networked PC with web server installed on it and private IP address assigned to it (192.168.1.2) to ...
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296 views

Trouble with NAT Type for 2 ps4's, Can't get open on both?

I have had a PS4 since release and have never had much fault with it until Call of Duty Black Ops 3 came along. I was excited to play zombies again and couldn't wait to play with friends however I ...
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1answer
25 views

SSH key lost in tunnel

I'm trying to connect to my private VPC instance through a NAT instance with tunnelling i'm defining -A to make the NAT instance an agent for my key and -i for the key file. When trying ssh -A -i ...
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107 views

no internet on centos 7 minimal virtual machine when it has a nat adapter and wireless internet connection

So, I have a lenovo thinkpad t410s. I used virtualbox and vmware. Both response the same and I think that the problem is on the laptop. When I connect the virtual machine through bridge adapter and ...
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1answer
41 views

IIS doesn't work when RRAS with NAT is enabled for VPN

I have a windows server 12 dedicated server and I use it mainly for hosting my websites, but I want to set up a vpn on it so that I can browse internet through it (my college restricts a lot of ...
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1answer
25 views

Internet Connection Sharing using routes

Situation I'm trying to share my Desktop's Internet connection to my Laptop. Here is the layout of my network: I only control the green computers. The routes on the desktop are automatically ...
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138 views

centos 7 virtualbox no internet, how to get rid of virbr0 and virbr0-nic adapters?

I have tried everything. I have 2 hosts and 2 centos 7 virtual machines with nat connection and wireless internet. The first has only lo and enp0s3 adapters and everything is fine. The second has lo, ...
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40 views

Networking with the netgear B90-755044-15

I have had a website running behind a Westell 7500 router for a long time. It was setup with out port forwarding, being DMZ host, or anything like that. It was setup as a "static NAT". Static NAT on ...
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71 views

Is it possible to configure a NAT routing device to have the same subnet on both WAN and LAN interfaces?

Case example for a router (or balancer, NAT gateway... etc): LAN interface (say eth0) with IP 192.168.1.1 on 192.168.1.0/24 subnet. Acting as DHCP (and internet) server. WAN interface (say eth1) ...
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34 views

Allow VM to be accessed outside host machine only via port

I have a VM A and VM B running on a host machine H. Both these VM are using NAT. What I want is that this VM to be accessible to outside machine within the same network but only via particular ports. ...
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41 views

Direct native traffic TCP file transfer between two NATted machines

Aim: I want to perform the fastest possible TCP based file transfer between two machines sitting behind two different NATs, in a situation where a public port cannot be redirected to any of the two ...
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2answers
141 views

How to connect a client behind a NAT router to an Asterisk server behind a NAT router?

I have an asterisk setup on a server. The local IP address is 172.22.9.200 and extenal IP address is 75.45.185.100. My client device is an android phone that is connected to a router and it which has ...
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2answers
287 views

How do I forward eth0 to wlan0?

I tried to forward eth0 to wlan0 on my Raspberry Pi B+ using NAT on iptables with the following commands: echo 1 > /proc/sys/net/ipv4/ip_forward iptables -A FORWARD --in-interface eth0 -j ACCEPT ...
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1answer
28 views

VMWare How to share the connection between a NAT and a host-only network?

I have 2 VMs running. (On Ubuntu 14.04) The first one has 2 network adaptater (NAT and host only) The second one has 1 network adaptater (host only). The first can ping google.com. The second one ...
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41 views

Loopback NAT not working for DMZ host

Since last year, my ISP basically forced me to use their all-in-one cable modem/wireless router instead of a standalone cable modem. I already had my own router (Netgear R7000) and as a result I'm ...
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1answer
16 views

Virtual Port Forwarding for Device Web Server

I've got a streaming device, where I've set the port for the webserver to let's say 3030 and I configured the router as follows: service name: some service Port range: 3030 IP Address: ...
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2answers
170 views

Double NATing Issues and DMZ Solution?

I just wanted to put this out there to make sure I am understanding everything correctly around double NATs in an apartment building and if my solution is sound. So I just moved to an apartment ...
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65 views

Testing ARP poisoning in VBox NAT network

I wanted to test ARP poisoning in a VBox NAT Network environment. I currently have 2 VM in the NAT network: a Kali Linux VM (IP 10.0.2.15) and a victim Ubuntu VM (IP 10.0.2.4) The other victim is ...
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41 views

windows server vpn with direct tunnels/connections between clients

I'm setting up a VPN for gaming which requires low latency connections. I'm trying to figure out how I can make the computers in my VPN to connect directly to each other instead of routing all traffic ...
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202 views

Hairpinning in Linux

I have a router in which I installed a Linux system. I want my router to support NAT hairpinning. Does a such feature exists in Kernel Linux? If yes how to activate it? Are there a patch to apply it ...
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59 views

Traceroute behind a Carrier-Grade NAT (IP address 100.64.0.0/10)

Is it possibile that a Carrier-Grade NAT blocks all incoming ICMP messages? Trying a traceroute from an IP address belonging to the range 100.64.0.0/10 it doesn't detect any hop, neither the first ...
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114 views

IP address from LAN side of client router appears in NAT table of primary router

I’m seeing what appears to be strange activity on my Primary router (the only router connected to the ISP modem) from one Android device. It could be that I’ve never seen it before as the day is ...
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137 views

Ssh Access to VMware Virtual Machine(NAT) From Host

I need to ssh into NAT based VMware Virtual Machines from host. What's the minimum requirement to do that? At first, it seems impossible to me, as NAT VMs have internal IP addresses (10.20.xxx), ...
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60 views

How to I configure iptables for both IP masquerading and firewalling at the same time?

I have a host that acts as a gateway for routing a home network to Internet. IP Masquerading has been enabled for months now and the system has worked fine. How do I configure it to function also as ...
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28 views

iptables wont take any arguments

I have an ubuntu server configured as a gateway router with eth0 (ext connected to a dsl router) and eth1 (internal network) I have Source NAT enabled, to share the external IP with all internal ...
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22 views

Torrent with different external/local port

I'm running a torrent client behind a router, I want to open the port for the client on the router, but I don't want to use UPnP, so I have to configure NAT. The problem is that the client sometimes ...
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3answers
152 views

Using a reverse SSH tunnel without port forwarding

I have already created a reverse SSH tunnel on Windows using FreeSSHd and am able to connect to it when inside the network. However, my ISP has blocked port forwarding and our internet is behind a ...
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2answers
257 views

Running DNS Server to circumvent NAT-Loopback issue

First I want to say that I probably read everything that there is on the internet regarding the problem. And the problem is that I can not access my owncloud over doc.selfhost.eu if I am in the same ...
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26 views

NAT64 using Tayga

I have successfully configured Tayga to facilitate NAT64. I gave a dynamic pool as 10.0.64.0/24. Currently, I have 2 IPV6 hosts configured and trying to ping an IPV4 host through the NAT64 server. ...
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51 views

HTTP server through NAT (without access to the router config) with a fixed domain name

I need my client to connect to my http server from outside and I don't have access to the router settings, we are trough NAT. Let's say the domain is going to be example.com My client must change ...
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67 views

How to setup a routing for NAT internal clients to connect to a internal hosts through external address and forwarded ports in CentOS7

I've setup an NAT environment using a CentOS7 with two NIC. And I setup a service in internal host and use firewall-cmd to setup a port forwarding rule. Everything works fine outside of the ...
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98 views

Complete masquerading NAT example using nftables on Linux?

I'm looking for a complete example how to do this using nftables. It should be a DHCP client on the upstream interface, have a 192.168.0.0/24 LAN on the other interface, and also act as a firewall. ...
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100 views

Is NAT loopback the only reason I can't view my own website from within my LAN?

I am new to this so apologies if this is the wrong place for such a question. I'm testing out a simple "hello world" website hosted at home. As we have not been assigned a static IP address by our ...
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69 views

VirtualBox 5.0.6, unable to start single VM after network configuration

I've installed VirtualBox 5.0.6 on Windows 10 64bit, and configured and installed a guest VM with Debian Jessi. Everything works fine at this point. Then I configured two port forwarding rules: port ...
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190 views

How to set up NAT46 on Linux router?

I have a internet connection supporting IPv6 only. But some of my devices (like an AV-receiver) are only capable of IPv4. ______________ | Linux router | ...
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Tried to NAT hole punch the router in a loop, why didn't it work?

Comments on this answer indicate, that the NAT is not consulted if the destination is in the same network. But what if the destination is the public IP of the router, not 192.168.x.x or similar? I ...
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399 views

IPTables NAT and virtual interfaces

I have 2 VM's running CentOS 7 with the following ifconfig configurations: VM1: ifconfig eth0: public ip eth0:0: LAN IP 172.22.xx.x1 VM2: ifconfig eth0: no public ip eth0:0: LAN IP 172.22.xx.x2 ...
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41 views

VirtualBox NAT transfer and multi-port forward

I need to copy a virtual machine to another computer. It is a NAT network setup and It has several IP address port forwards. Is there a way to either transfer a configuration file for the NAT setup or ...
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1answer
23 views

Clarification on NAT host

My router has a option to choose a NAT host IP address by specifying the last byte. What is this host IP address? Isn't NAT on by default in routers? Wouldn't the outside world see the same IP ...
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1answer
490 views

Mark packets with iptables by destination mac address

I need to mark packets which goes to a specified mac address. I need this to use in shaper with tc. --mac-destination doesn't exist in iptables. Also I tried to use ebtables: ebtables -t nat -A ...
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1answer
397 views

disable NAT in openvpn

I'm having a similar problem to this: OpenVPN without NAT Seems it wasn't answered yet. Description of my situation: I have an openvpn server on network A which another admin installed before he ...
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1answer
158 views

What are the security risks of connecting to a VPN?

Does connecting to a shared-IP VPN expose local ports to other users of the same VPN server? Does a VPN tunnel neutralize the protection offered by a NAT router? Are local ports reachable from a ...
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1answer
78 views

How to configure an Amazon EC2 instance inside a VPC (Virtual Private Cloud) without NAT?

I need a server on the network which has direct public IP address, not behind NAT. I’d like to use Amazon EC2 for this due to its flexibility and my familiarity with it. But as far as I can read so ...
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127 views

Not able to ping Ubuntu VM from host deployed using NAT

I have Windows 7 as a host operating system and have created a Ubuntu VM using NAT Network configuration. IP Address of VM is 192.168.182.134. However when I am trying to ping it using command from ...
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Having problems with setting up server behind NAT

My OS: CentOS 7 Server: Apache Equipment: Sterlite SAM 300AX Okay so I'm trying to set up my server on my home connection, and been having some problems. I have been allotted a static WAN IP by my ...
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How long does NAT keep a TCP translation field in it's table

I was wondering if I could create a TCP client on machine A and connect it to a remote host (S) and then close the connection from client side and create a TCP listener on the on the same machine ...
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72 views

NAT port forwarding of the same service run on multiple hosts?

Is port forwarding of the same service running on distinct hosts behind a NAT, on the same port possible? For example, if there are two hosts 192.2.0.2 and 192.2.0.3 using the gateway(NAT) 192.2.0.1 ...
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How is Windows ICS service different from Linux-based NAT & routing when I want to hide my LAN structure from ISP?

Background I've been using a WIFI-router as my home gateway perfectly until my ISP appears to restrain the number of connected devices. And currently there is not any realistic upgrade plan from the ...