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

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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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1answer
20 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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23 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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7 views

Ftp behind nat mobile tethring

Hi from the title above you already know what I need well let me allow to tell you get things I have a phone as I can't get a router set up I use my mobiles hotspot and now want to set up an ftp on ...
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2answers
29 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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19 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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1answer
13 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 ...
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16 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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6 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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25 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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29 views

NAT with multiple interfaces

________ +------------+ / | | ...
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14 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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1answer
26 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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43 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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2answers
46 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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54 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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1answer
17 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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1answer
56 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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1answer
49 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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1answer
99 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
23 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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41 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
17 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
21 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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77 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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28 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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1answer
40 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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1answer
22 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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1answer
27 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
57 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
93 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
17 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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24 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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18 views

How to use OpenSMTPD behind a NAT to relay messages through Amazon SES?

I am trying to set up OpenSMTPD to relay mail through Amazon SES, and my machine is behind a proxy. This gives me some problems I had not anticipated. If I use a configuration like accept from local ...
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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
103 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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43 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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35 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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1answer
72 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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38 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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1answer
73 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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105 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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1answer
51 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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26 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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17 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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79 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
101 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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19 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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28 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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37 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 ...