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

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Cisco NAT problems (Packet Tracer)

I have a little problem with my NAT configuration. When I ping 2 separated PC or laptop, the ICMP packet does not "find" the route back to the source machine. The NAT translate the IP when the ...
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12 views

Hairpin NAT with dynamic WAN IP

I have a dynamic WAN IP so if it changes my iptables will no longer apply. Here is my working hairpin nat, where x.x.x.x is my WAN IP br0 - LAN eth1 - WAN -A PREROUTING -d x.x.x.x -p tcp --dport ...
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10 views

Is there any benefit to 2+ machines seeding behind a proxy server?

I'd like to know if there's any benefit (increased speed etc) to seeding torrents on more than one PC even though they all share the same proxy server with NAT'ing capabilities.
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19 views

ISP home network PAT vs NAT

Is there an easy way to figure out whether my router is assigned an address by my ISP using NAT (Network address translation) or PAT (Port address translation)? I want to figure out if my public ip ...
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6 views

ALG IPSEC and RSTP

I have linux 3.18. my Linux is installet on a router. in this router I activate a NAT from the wan side. Does this Linux support ALG of IPSEC and RSTP ?
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pfSense does not close connections coming from LAN

I created a NAT rule that redirects external_ip:1234 of modem (pfSense itself) to 192.168.1.100:1234. I also wrote a server application which listens for connections on 192.168.1.100:1234. When I ...
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24 views

Packets don't come back in a network with NAT in Cisco Packet Tracer

This is my network: I have done my best to try to solve the problem, but with no success. Whenever packets come from LAN 1 or LAN 3, the local IP addresses are translated into one of the 3 public ...
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11 views

Static public IP for NAT connection

I've Installed an Apache web server on my PC. I know an Apache server can be accessed by the public IP of my computer. But in my case, I do not have a unique public IP address. Because my ISP using ...
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I cant connect to my web server from my LAN using its public ip

i created a static nat, by mapping a private ip 10.x.x.50 to the public ip 41.x.x.12 even though i can ping the public ip (41.X.X.12) from my lan. I cant access the web server from my LAN but i am ...
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35 views

How to avoid Double NAT?

I have a modem/router supplied by my ISP. The optical fiber connects to it and Internet and telephone lines come out of it. Unfortunately, the DNS server settings on ISP router are fixed and cannot be ...
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16 views

no-ip and double NAT, will it work?

I have a modem router from ISP which I connect to my 2nd router. The modem router from ISP does not have bridge mode so I just put my 2nd router IP to DMZ. Topo : Internet --- Modem router --- 2nd ...
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18 views

Problems with NAT - Wireshark shows TCP Dup ACK

I'm having some issues with NATing to a couple of web servers on my site. I initially thought it was my firewall after an update (smoothwall) but I blanked it and reinstalled and its still not ...
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21 views

How to ensure, that firewall does not pass any external packets into LAN?

Am I correct thinking, that in the case of NAT and correct firewall config, one should see no any packages with "source address" equals to global IP inside the LAN? Or NAT server will keep source ...
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38 views

VirtualBox natnetwork start failed

I use VirtualBox 5.0.16_Ubuntu, Ubuntu 16.04. When I added a new NAT network and try to start natnetwork service, I got some error: ~$ VBoxManage natnetwork add --netname openstack --network ...
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9 views

How does IPsec operate in NAT environment?

I know that if you mess with IPsec header it will drop the packet and NAT is build exactly for that. How do they deploy IPsec where NAT is also needed.
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52 views

PPTP VPN connection in a (bridged) virtualbox Kali Linux 2.1 VM

im a relatively new user to linux and virtualization software such as virtualbox, so im kind of confused as to how to configure my networking settings for the vm im using (kali linux 2.1), my host OS ...
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29 views

Connection between 2 computers behind NAT

If I am A and know the IP public of B and his internal IP and B has open the port 1000 for incoming messages and I send a packet from A to B using all data i know of B, will the packet come to B? ...
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20 views

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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32 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 ...
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11 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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9 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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21 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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53 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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9 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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23 views

Creating a local NAT behind WLAN client

I want to use my DD-WRT device as a client for an existing WLAN but I'd like to have NAT to jail some devices. For this purpose, I configured the DD-WRT like the following: LAN local ip ...
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66 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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53 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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89 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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61 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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65 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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27 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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45 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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41 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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126 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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28 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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81 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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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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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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43 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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30 views

NAT with multiple interfaces

________ +------------+ / | | ...
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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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42 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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47 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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201 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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116 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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23 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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73 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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65 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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254 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 ...