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

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UDP Port Forwarding and outgoing port

For UDP, assume that an incoming port (say X) is forwarded onto a port on a local host (say Y). Does that guarantee that any outgoing traffic from port Y from the local host appears as traffic from ...
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39 views

Can't make static route and NAT work together

My home LAN is a rather standard 192.168.2.0/24 network with gateway on 192.168.2.1 and has DHCP on addresses from 100+ configured on an ASUS router (RT-AC66U). The WAN is configured via DHCP from ISP....
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How to configure Linux iptables to block a specific port of server?

I am trying to implement port restricted cone NAT. I want to block a specific port 3479 of server 192.168.10.102. iptables -A INPUT -i $WAN -p udp -s 192.168.10.102 --sport 3479 -j DROP iptables -A ...
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37 views

How can I do DNAT and SNAT on Windows 7?

I have a very old program which uses a fixed IP address as destination. I'm trying to revamp my network into something more modern but this legacy system is holding me back. As a simple solution, I ...
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47 views

Computers can't access each other when both of them connect to Apple NAT64 hotspot

We have an iOS App on App Store. To submit a new version after Jun 1st, 2016, we have to support an “IPv6-only network” according to this link. We referred to Apple's documentation, upgraded a Mac ...
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22 views

How do I disable CGN (LSN) so I can host a server?

I have figured out that inbound packets do not reach my home network due to an apparent existence of CGN. This fully inhibits my ability to host a server. I have set up everything correctly; port ...
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32 views

Can't get open ports for a server (possibly modem related)

I am attempting to host an Unturned server. It is running from a dedicated box on my local network. I have correctly port forwarded on my Netgear router. My modem (Thompson ST5) also has an option for ...
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37 views

How to configure NAT to act as port restricted?

I am working on a project which require me to test with different type of NAT. I am using a laptop which is acting as Linux router. Due to some reason it is not able to correctly identify NAT with my ...
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69 views

How can I communicate to multiple devices that are all at the same IP address?

I work in a manufacturing environment and I have the need to communicate with up to 50 devices that are all at 192.168.0.2 from a single (Windows) computer. Assume that I don't have the ability to ...
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37 views

How to route all traffic from one vm through other vm on OS X

Challenge: to get one Debian VM (Virtualbox) to route all its traffic through another Debian VM (Paralles), both hosted under OS X 10.11.5. I've tried for days, I hope you can help here. Schema: vm1 ...
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33 views

Purpose of port forwarding

This following article talks about Network Address Translation (NAT) and port forwarding. http://superuser.com/questions/284051/what-is-port-forwarding-and-what-is-it-used-for What is the point of ...
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57 views

VPN server behind a NAT without port forwarding

I installed the SoftEther VPN server on a raspberry pi which is connected via LAN behind a NAT/Firewall. The client should be an Android as well as an iOS device and should access the server from the ...
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Trying to share proxy connection for my droplets on DigitalOcean

I'm using CoreOS 1010.5.0 (stable) on one DigitalOcean droplet. I have an http proxy connection setup, so that when I connect to the "outside" world, the external IP shown is not the one I have (as ...
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24 views

Test environment post carrier-grade NAT by ISP

Today I replaced my old router with a new faster router in my home. However, this event appears to have migrated me to carrier-grade NAT'ing by my ISP. I tried with my old router but the same holds ...
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32 views

Creating a poor man's DNS/name resolution with VirtualBox NAT network

I am running VirtualBox 5.0.22 on Windows 10 Pro (mikaw10) as host and have set up the following systems all with one NIC and a NAT network called unix-machines: Ubuntu 14.04 LTS 32 bit (ubuntu1404) ...
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14 views

Exchange Server DAG and Failover Cluster with High Availability

I have 2 exchange servers (EXCH1 and EXCH2) that have Exchange 2013 on them. They are both on Windows Server 2012 R2 (Standard) machines. They are also a part of a DAG (Database Availability Group) (...
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42 views

NAT in simple home LAN

I have a simple LAN at home. The LAN-side computers have by default an access to the WAN (internet). By default i mean i didn't changed/configured anything in the modem/router connecting the LAN to ...
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23 views

OSX mDNSResponder opening all ports on Billion

I recently swapped my router for a Billion 7800VDOX, and noticed some attempted connections to my iMac from external addresses. On investigation I found that a uPnP port had been opened on the router ...
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24 views

Set an OpenWRT as a Dumb AP while running 6in4 tunnel?

The computer connect to OpenWRT router through LAN port, the router connect to another router using WAN port. So it's like: Computer -> OpenWRT -> External Router(Still in private address setup) ...
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22 views

IPTables — Forwarding to Attached Client but keep source IP

Here's my scenario: I have a VPS that has two IP addresses and is running OpenVPN (IP Address of OpenVPN server: 10.1.2.1). I want to forward all received traffic on ONE address to VPN-client (10.1....
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255 views

Windows 10 - NAT - Port forwarding & IP masquerade

I'm looking for a way to get iptables functionality in windows 10. I enabled IP routing and I need to forward tcp data to another host (port 8080) and then forward his response while masquerading IP. ...
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Not all subnets in OpenWRT can access internal device via WAN

On my OpenWRT router I have such interfaces: Lan1, physical interface eth0, IP address 10.10.0.0/16 Lan2, physical interface eth1, IP address 10.11.0.0/16. Wan, physical interface eth2, IP address ...
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29 views

pfSense Port Forwarding using Alias Not Working

I am running a pfSense 2-3-RELEASE firewall and I am trying to set up NAT port forwarding so some development servers and my Mac. The servers (FreeBSD) have statically assigned IP's and my iMac has ...
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51 views

AWS nat instance doesn't route to the internet

I have a vpc, the vpc has two subnet, one is public to internet (10.20.7.0/24), one is private (10.20.8.0/24). In public subnet, I have a machine use aws commuity ami to create for NAT, in private ...
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UPnP NAT Traversal Custom IPTables Server

I'm looking to make a multi-subnet router at my house using a Linux box and IPTables. However, I need UPnP support for some services. From what I understand (though this is hard to find in the ...
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78 views

Configuring NAT on a Thomson cable modem/router

I have a simple cable modem (Thomson TWG870). I've looked in the manual, but there is no option to select the NAT type the router uses. Can I conclude that the only - and default - mode is port-...
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51 views

NAT Port Mapping from external IP to internal Web Server not working

I am trying to setup an HTTP server using Virtual Box on my Win 10 Host. The network is being set as a bridged network on the Guest using the ip 10.0.0.254. Opening the browser with that IP is ...
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130 views

Why disable NAT passthrough?

According to this article NAT passthrough is a router feature enabling outbound VPN connections from LAN computers. My Asus router has NAT passthrough for three VPN protocols: PPTP, L2TP and IPSec. Of ...
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81 views

Using an ADSL modem/router as modem only

I have a D-Link DSL-2520U ADSL modem router and a Netgear WNDR3700v2 router. I want to use the DSL-2520U as ADSL modem only, and the WNDR3700 for NAT, firewall, DHCP and wireless access. How I should ...
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iptables whitelist doesn't work while blacklist does

Allowing forwarding for all and blocking a set of ips work: iptables -P FORWARD ACCEPT iptables -A FORWARD -m set --match-set denied_ips src,dst -j REJECT But denying forwarding for all and ...
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46 views

Create Private Network based on TOR

I have a home server with deployed OpenStack and few cool services that I use, everything is inside my home network. I wanted to use this service outside the home network. I started with hamachi and ...
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UFW Ubuntu NAT with virtual interfaces setup

Trying to setup NAT on a (VPS) virtual private server. Running Ubuntu 14.04. All the guides I see mention using eth0 interfaces in the lines. Example -A PREROUTING -i eth0 -d 25.25.25.26 -j DNAT -...
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46 views

Static routes and multiple routers

I have the following set up: My office is located out of town and unfortunately I can't get fibre. Fortunately, I have a mate in town who can get fibre. He has pointed a p2p WIFI modem at my place. ...
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How best to configure my Airport Extreme and uVerse Gateway to work together?

I have AT&T U-Verse internet service. I have their 2WIRE-manufactured wireless residential gateway (RG). It's an older one, with only 802.11g support. I have lots of devices, both wired and ...
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Most efficient way to route all traffic from eth0 to wlan0

I use a Raspberry PI (model B, first generation) as a NAT router. I use a wifi usb adapter to connect to a wifi network, and route all taffic to eth0. I enabled NAT and issued the following iptables ...
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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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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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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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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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71 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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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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45 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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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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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 working....
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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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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 "192.168....
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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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86 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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33 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? ...