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

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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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153 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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65 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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29 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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23 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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197 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 NAT....
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312 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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34 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. Now,...
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73 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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73 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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127 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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119 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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75 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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1answer
272 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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36 views

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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454 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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42 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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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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698 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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557 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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186 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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82 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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139 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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63 views

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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76 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 ...
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65 views

Is it possible to set up WAN connection on a VLAN (Cisco Router)?

I'm trying to set up NAT load balancing (or failover) with two ISPs on my 1941 router. The router has only two WAN ports and 4 EHWIC ports (which are basically switch ports). One of the WAN ports is ...
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469 views

Is it possible to setup a NAT loopback on a router with a dynamic IP using iptables?

I've set-up a Raspberry Pi home server attached to my router. I have a dynamic IP. I can access the server within my network using the internal IP (192.168.0.8). I can also access the server outside ...
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1answer
953 views

Forwarding ports after carrier grade NAT?

I cant forward ports anymore to my Xbox cause turns out my ISP recently refreshed IPs and all their IPs are public now and they say you can only forward ports if I request a static IP for a large ...
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51 views

Setting up server behind uncontrolled firewall

(Firstly, I apologize if this is on the wrong site. I am not a network engineer or a web master or anything like that.) Going off to college and my brother and I want to continue hosting a minecraft ...
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347 views

My Huawei B890 router is not accessible over the internet

It may be a beginner question but I called my service provider and the manufacturer and they have no answer for me. I want to have a remote access to my Huawei B890. On the management panel, I ...
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Networking between two VMs via host

I have two virtual machines in VirtualBox. I would like to do networking between them via my host OS. In this case they should interract only via my os. I tried NAT but I can't ping then both my OS ...
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81 views

How does a NAT differentiate between the receivers(behind it) of a packet stream?

After reading this question, I still don't understand how packets are being mapped to the their corresponding hosts(receivers) behind the NAT in the case of connectionless protocols. The accepted ...
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67 views

Most efficient way to proxy a port from one host to a port on another

I have a host with one IP address which is using port 443 (HTTPS) with one certificate. I want to run a second app on this IP address using a different certificate on a different port. To prevent ...
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virtualbox: set up a private network for my VMs

I have a few virtual machines I used to access with ssh. I set up their network configuration as Bridged and I set a static ip to them. But, as I'm moving from work to home to customer, the subnet ...
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148 views

Why do we need MAC address? [duplicate]

I have read that if we are using NAT, router knows where to send the incoming packets in the local network based on TCP/UDP port information. If this information can be used to uniquely identify each ...
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213 views

iptables - allow access to a web server from the outside

I am trying to allow access to a web server from the outside and I am getting nowhere. Granted I do not have any experience in iptables, but I have dabbled in Cisco ACL and NAT. I am not sure what I ...
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208 views

Private to private network address translation

I need a black box that will translate 192.168.1.1 to 192.168.1.2. Can a NAT router do this? The problem that I am trying to solve: I have 2 devices with identical IPs of 192.168.1.1. The devices ...
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NAT configuration for HTTP server

There is a router (192.168.1.1) having static public IP(hypothetically- 8.8.8.8). This router is programmed to forward all incoming port 80 (TCP/UDP) connections to a particular IP (192.168.1.105). ...
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266 views

How can I get rid of the double NAT in this network?

Topology: Incoming Traffic > Modem > Router > Switch > Rest of Network In this image, notice IEAS-FILESVR, incoming traffic goes to the modem/router "IEASOFFICE" into the switch, to the FILESVR ...
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133 views

Why does iptables not doing DNAT for the same subnet?

I have the following NAT setup: Whereas Host 1 has a VM with IP 10.0.0.3 and HOST 2 has a VM 10.0.0.4. The NAT box will have a NAT rule such that it changes the dest IP 172.24.4.2 to 10.0.0.4: -A ...
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Net-Gear router Hacked port 5000, don't no what to do [duplicate]

I have been through 4 routers already every router I get keeps getting hacked. It opens ports 5000, 80, 23, changes the firmware on my router and I can't take port forwarding off. Http & https is ...
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46 views

Item's refresh in Port Address Translation Table

When does an item is removed from PAT Table? In TCP I would say it happens when connection is closed, but I'm actually not really sure. Does NAT Device know when a table's entry will never be used?
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NAT iptables : why wrong/empty destination in saved config?

Here is rules I put in iptables : $ iptables -t nat -A PREROUTING -i wlan0 -p tcp --dport 80 -j DNAT --to-destination 19.11.11.1:80 $ iptables -t nat -A POSTROUTING -j MASQUERADE ...
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64 views

Do I need STUN?

My router has a "real" static outer IP address. Behind router's NAT there is an Asterisk server. Router is configured to forward 5060 UDP port to Asterisk machine. Do I need STUN server assuming that ...
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SIP: The other party can't hear me but I can hear them when using Asterisk

Please read carefully all the question and do not rush to a conclusion. === Test environment for point-to-point calls, without Asterisk === City1: A router with NAT and WiFi and 5060 UDP port ...
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95 views

One virtualbox linux machine act as router the for second virtualbox machine

I have 2 virtualbox machines setup with debian. The first one has 2 network adapters: NAT and Internal Network, the second one has only 1 network adapter: Internal Network. On the first one I have ...
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179 views

Virtualbox NAT port forwarding not working

I am trying to forward Growl messages from my virtualbox windows guest to the growl notifier instance on my windows host. Growl runs on port 23053. Here is my network configuration. But I'm not ...
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92 views

Change default network settings for VirtualBox when using NAT

I'm running into an issue where VirtualBox is assigning a guest from 10.0.2/24 when using NAT mode. The problem is its a real network on this site. I see how to change the setting for a particular VM....