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

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What causes this extremely strange Port Forward behaviour?

The scenario Basically, for about 10 years I lived in a country where my ISP gave me a NAT'ed address on their end (MAN). So I couldn't port forward unless I paid. However that was not an option. I ...
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73 views

Telnet to smtp.gmail.com 25 timing out inside vagrant box

Vagrant 1.8.1, Virtualbox 5.0.16, Windows 7. Vagrant using hashicorp/precise64 image. No modifications done to Vagrantfile. Using the default NAT networking. vagrant@precise64:~$ telnet smtp.gmail....
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15 views

Multiple hosts port-forwarding

Can I have a router-A(all hosts connected to this router) that is assigned an IP from another router-B that is connected to a WAN connection then be assigned ports that are forwarded. Would this ...
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10 views

Accessing a printer through a router, with complications

My development network is divided into production and proving. Once things are proven they are moved off to a hosting service. It used Internet service from the local ISP. So, the Internet is ...
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31 views

Multiple Clients Using Same Ports NAT

Can on a consumer grade router, say an Asus RT-66u, are you able to open multiple ports for all clients trying to access them? I've tried port triggering, but it only helps the first client that gets ...
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81 views

Making Sense of ISP's Network Topology

I recently noticed something odd while performing traceroutes from my home network, and its made me wonder as to the architecture of my ISP's network. My home network uses 192.168.0.0/16 addresses (...
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11 views

Trigger API on a Machine with private IP

I have an API server running on my local machine. I would like to trigger that API from an AWS instance. The machine's IP is assigned through NAT. Is there any way to trigger the API from outside the ...
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32 views

How should I configure my Linux kernel (running on armhf architecture) if I want to use the NAT-table in iptables?

I successfully compiled a Linux kernel (version 4.4) with nat support for my desktop computer that runs on a x86-processor. Now I want to do the same for my server which has an ARMHF processor. The ...
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167 views

Ajenti not accessible on Port 8000?

I have an Ajenti installation on a dedicated server on my home network, which is portforwarded to Port 8000. Using canyouseeme.org, the port shows as open, however when I try to access it using the IP ...
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92 views

iptables - kill established NAT connections

I have the following setup: PC eth0 connected to GW eth1 GW eth0 is connected to the internet. GW has net.ipv4.ip_forward=1 in sysctl.conf So, when I simply run (in GW): iptables -t nat -I ...
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216 views

How to enable NAT Loopback when modem connects to router

I want to see my hosted pages using my public address from inside and outside my network, but so far I can only from outside. The thing is that I recently changed ISP, and they brought me a ZTE-F660. ...
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78 views

Would NAT be eliminated transformed in ipv6?

NAT is a wonderful concept used in ipv4. It is the major reason for the existence on internet, in my concerns. There are no networks in the world that doesn't work without employing NAT. All I seek ...
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101 views

iptables routing of wlan0 to usb0 and usb1

Server: wlan0 (WAN) - 192.168.0.17 usb0 (LAN) - 192.168.2.15 Client: usb1 (LAN) - 192.168.2.2 wlan0 <-> usb0 <-> usb1 How do I configure a NAT to share my wlan0 internet access to my ...
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39 views

VPN and NAT access behind router

I am setting a VPN server and I am having a headache, because I can't make it work. My setup: Local LAN with 192.168.1.0 subnet behind a router. Server with two NICs in the same subnet, Internal: ...
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98 views

I need to spoof the source IP of a packet

I'm running some tests for a security project and here is the scenario. I have a SIP server (SBC) that accepts calls from a list of IP addresses. I have a SIP INVITE packet and I want to send to that ...
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58 views

Internet Connection Sharing (ICS) Port Forwarding?

When connecting my XBox One to my laptop via ICS I am able to open port 3074 required to receive an open NAT type, but other ports do not appear to open when added using the same method as 3074, using ...
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358 views

how to do port forwarding if my router wan ip is different from public ip?

I have an IP camera and i want to access it from anywhere around the world. I have configured my NETGEAR-router JNR1010 for port forwarding but the WAN IP it gives me is different from the public ip ...
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49 views

What is a simple STUN test I can perform from a Windows machine?

I want to test whether someone else's Windows machine can access a public STUN service using UDP and receive a response on its network, which I expect is behind a NAT and firewall. I do not have ...
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143 views

Forward HTTP port on mikrotik 1 to an address on another mikrotik

Trying to apply the Hairpin-nat concept on mikrotik1, my config is something like: /ip firewall nat add chain=dstnat dst-address=1.1.1.1 protocol=tcp dst-port=80 \ action=dst-nat to-address=192.168....
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32 views

bsd (osx) pf nat - change source port on outgoing UDP packets

I am running docker-machine on osx. docker-machine is running NAT so when my container send out a UDP packet on port 1812, NAT is translating it to some random port. I am playing around with pf nat (...
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12 views

How to obtain the proxy resolver configuration of a Virtualbox VM

Virtualbox provides two configuration flags to modify the DNS behavior of the NAT engine for a virtual machine: VBoxManage modifyvm "VM name" --natdnsproxy1 on VBoxManage modifyvm "VM name" --...
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66 views

NAT doesn't allow TCP ACK for sent TCP SYN

We are using TCP Simultaneous Open for connecting TCP socket. Lets call one SideA and other SideB. From the wireshark log I see that first two SYN sent from SideB is blocked by SideA NAT. Then SideA ...
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35 views

NAT with multiple interfaces

________ +------------+ / | | | +-------------+ Provider 1 +-----...
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24 views

setting up a remote access between two NATted hosts for remote assistance

I need to reach remote sparse machines (ARM Linux Appliances) for maintenance and support. All these machines are Customer owned and plugged into their own private LANs (where I have no privilege), ...
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66 views

Is it possible to achieve open NAT (Type 1) on my PS4?

I have the Huawei B5142 device from my carrier. This device is the source of internet connection to my home's router. My PS4 is wirelessly connected directly to the Huawei device, bypassing my router. ...
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55 views

How to reconfigure NAT servers so they are exposed?

Here is what I have: Live HTTP server (104.x.x.x) DD-WRT'd wireless router (192.168.2.1 / 8.8.8.8 DNS server) Win 8 Notebook PC (192.168.2.100) VMWare BIND DNS server (192.168.3.108 / NAT on ...
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531 views

Set up VPN server on a DD-WRT router behind NAT

I am trying to setup a PPTP VPN Server on my DD-WRT router behind NAT (the ISP router of my provider). I've done a lot of googling, but it seems like not many people mention about this exact scenario ...
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153 views

VirtualBox NAT--no connectivity: Ubuntu 14.04 guest, Windows 10 host

When I'm in bridged mode, I can connect with ethernet and some wireless networks (but this obviously requires switching nic back and forth). At work I can't connect through the wireless; we have both ...
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34 views

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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82 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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88 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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377 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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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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142 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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65 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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27 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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174 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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47 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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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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37 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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44 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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170 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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407 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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55 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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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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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: 192.168.1....
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180 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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75 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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46 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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326 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 ...