Questions tagged [nat]

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

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How packets are delivered from server to local network?

I am new to networking and am trying to understand how packets are routed on the way back from the server. I learned that when packets go out from the local network, the source address is translated ...
Dan Chen's user avatar
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1 answer
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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 ...
user555542's user avatar
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3 answers
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Set up Linux box as WAP for MyBookLive?

I inherited an old Linux box as well as a MyBookLive and would like to make the MyBookLive available over my wireless, essentially using the Linux box as a gateway. I just wiped the Linux box (home) ...
Jiahao Chen's user avatar
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Trying to run a local server with port forwarding behind a carrier grade network from ISP, but getting no connection with localhost

i'm trying to make a half life server by portforwarding trought my router. It didn't work, i checked it out, and my public IP and my WAN IP were different, then i realised that i was in a carrier ...
João Peterson Scheffer's user avatar
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1k views

How to connect to a torrent tracker running on a local host?

I want to share huge files via bitTorrent. I'm using Ubuntu 18.04. I've set up a tracker opentracker listening to port 6969, and a client kTorrent listening to port 6881. My network uses NAT. I ...
havon's user avatar
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Asus router cloud double NAT

I'm building my personal cloud based on Asus routers. I would like to connect a 1TB hard drive to this router and switch it on/off remotely with a phone. So far so good, everything works fine, but I'...
JZK's user avatar
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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 ...
JakeRobb's user avatar
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Conntrack gets incorrect forwarding rules for outgoing protocol 41

I'm trying to forward protocol 41 (ipv6-in-ipv4) for an HE tunnel through a WRT54G running Tomato 1.28. Tomato 1.28 is running a 2.4 kernel that knows absolutely nothing about protocol 41, except that ...
interfect's user avatar
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How does uTorrent can automatically forward port through Linux Net Filter based firewall?

I have dilemma: How it is possible that uTorrent shows on my internal machine with internal IP, that my connection is OK (green check in the bottom right of its window), while I never forwarded any ...
saelic's user avatar
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2 answers
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Attach network interface to vmware nat (bridge is not working perfectly)

I have a developer computer with two physical network interfaces (NIC A and NIC B). I have VMWare workstation and several virtual machines in VMNet8 (NAT). I would like to connect my notebook to my ...
lajos.cseppento's user avatar
3 votes
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Does Guest WiFi on an Access Point make any sense?

I have a Belkin WiFi Router which offers a feature of a secondary Guest Access WiFi network. Of course, the idea is that the Guest network doesn't have access to the computers/devices on the main ...
Jason Kleban's user avatar
2 votes
1 answer
300 views

Why is my public IPv6 address different from the one listed in linux

Going to [whatismyip.com][1] on different devices inside my home network provides expected results, the same IPv4 address and different IPv6 addresses on each device. However, upon looking at the ...
Ethan Raque's user avatar
2 votes
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2k views

WSL2 Routing and NAT Rules

I recently installed WSL2 on my Windows 10 PC and I'm trying to understand how traffic is handled to and from WSL2. The below article states that WSL2 is running as a managed Hyper-V VM and uses a NAT ...
ikrnjajic's user avatar
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in windows 10, all files in explorer ftp window have associated with chrome, how can I change this?

I tried out an app on my android phone called cx explorer mentioned here https://android.stackexchange.com/questions/167789/is-there-a-way-to-access-the-phone-filesystem-from-computer-wireless my aim ...
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My network setup do not work. FreeBSD

This question was asked by me on serverfault.com. It was closed as off-topic, with a suggestion to ask here, on superuser. The OS is FreeBSD 13.0. The setup that I need to establish is simple. In ...
user14063792468's user avatar
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Port forwarding with multiple WAN default routes in OpenWRT

I have an OpenWrt setup with multiple WAN connections, and a DNAT port redirect that provides access to a server in my LAN. I want my server to be accessible on both WAN connections simultaneously. I ...
ManSamVampire's user avatar
2 votes
1 answer
2k views

Why my Windows NAT is inactive?

I run HyperV VM with Windows Server 2019 on my physical laptop with Windows 10. I want to have access to internet on Widnows 2019 so I created NAT on my Windows 10. I executed following command in ...
Mariusz's user avatar
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Symmetric NAT - Peer to peer WebRTC

I am currently working on a WebRTC project that aims to communicate people by video conference in peer-to-peer. However, according to the WebRTC documentation, there may be a problem when a user is ...
Mat's user avatar
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0 answers
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SSH forwarding through NAT times out for one machine, but not another

This just started happening a few weeks ago seemingly out of the blue. Essentially, I have my home router setup to forward SSH to my home server. I can SSH into my server just fine from outside, but ...
sagargp's user avatar
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NAT Loopback (hairpin) not working - OpenWRT

I have a home network with a modem and a router (SmartRG SR905AC) provided by my ISP (EBOX). The firmware version of SMART/OS is 10.6.5.1, which is "Powered by OpenWRT", but they don't mention which ...
Vincent L's user avatar
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Turn a multi-hop ssh connection into a direct connection

I have a machine behind a NAT (that I don't control) that has a reverse SSH connection to a home machine. I can then ssh into my home machine, and via the open reverse connection to the NAT'd machine, ...
Him's user avatar
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2 votes
2 answers
538 views

Wake up a computer over Internet using another computer in the same local network

I have two Arch Linux-powered computers, 'A' and 'B', connected to the Internet via the same router. I have configured and tested Wake-on-WAN on both of them. Both computers are shut down most of the ...
ivanp7's user avatar
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Double NAT for isolation

I have an existing network but want to provide WiFi in a room that is isolated from my main network. I thought a simple WiFi router would be good for the job as the NAT will prevent access to anyone ...
Richard's user avatar
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How to force users create host-only VirtualBox VMs

Managing many users within a security-strict network makes a VM a bad option. If the admin allows the installation of VirtualBox throughout the network, how can admins force users to setup host-only ...
Tarek Eldeeb's user avatar
2 votes
0 answers
2k views

OpenSwan VPN Routing/NAT

I am setting up a vpn to one of our customer's networks. Due to a requirement on their end, we cannot have our traffic (appear to) come from a private ip address. I have been able to get a tunnel ...
Joel Bouwkamp's user avatar
2 votes
0 answers
517 views

separating two networks with DMZ?

I am a college student wanting to get into server and networking but I have an issue I need help with at home. I asked a question about a year ago about creating two separate networks with the same ...
Josiah Christiansen's user avatar
2 votes
0 answers
2k views

How to port this NAT scenario from WindowsXP to Windows 10?

Scenario: computer1 has 2 Ethernet NICs. One of them (external interface) is connected to the internet computer2 has 1 Ethernet NIC computer1 (internal interface) and computer2 are connected directly ...
Windows11's user avatar
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1 answer
11k views

How to redirect all traffic in eth0 to eth1 and back

I have a Ubuntu box with eth0 and eth1. How can I redirect all the traffic coming from eth0 to eth1 and back? Should I do DNAT and SNAT like below or just forwarding or both ? Edit My case is like ...
nkg's user avatar
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VirtualBox NAT: ICMP works, TCP doesn't work

I am using VirtualBox 5.1.8 (and 5.1.18) on Windows 7 with guest Kubuntu 16.04 Set up: Guest has only one network interface with mode = NAT Windows Firewall is Off (all profiles, all interfaces) I ...
Max Kosyakov's user avatar
2 votes
1 answer
3k views

Connect two virtualmachines on different host machines

In Virtualbox is it possible to connect two VM's on two separate host machines on the same network using NAT? I currently have two linux boxes (VM's on seperate Host machines) that aren't able to ...
Jay Hawk's user avatar
2 votes
0 answers
1k views

netflix stall via linux iptables nat, tcp checksum errors (with workaround)

I've been trying to track down this problem for several days. I still haven't worked out what is going on, or how to fix it properly, but I do have a workaround. Problem summary Netflix stalls when ...
tpr's user avatar
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292 views

What are the use cases when STUN does not work?

I understand that STUN does not work with "symmetric" NATs. They assign (i.e. replace the address on the network layer and store the information in a forwarding table) a different port for every ...
DBRN's user avatar
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How to create enought traffic to bring my router down?

In our office we have a TP Link TL-ER604W router. Sometimes the router runs into problems and nothing in the network works anymore, also not the connection to the router itself. The only possibility ...
meles's user avatar
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0 answers
1k 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 ...
MGSoto's user avatar
  • 457
2 votes
2 answers
171 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 ...
omencat's user avatar
  • 436
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0 answers
593 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 ...
Kintarō's user avatar
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0 answers
214 views

Simulate SNMP Trap with SNAT

I have to test SNMP 2c Traps. I want to send those traps from some computer and the trap destination has iptables. So before the trap enters the NMS, I could just rewrite the real source of the trap ...
heiri's user avatar
  • 21
2 votes
2 answers
3k views

link machines which are both behind NAT via ssh tunnel

I have two machines. both behind NAT. Also I have access SERVER from each machines. Is there way to do ssh tunnel from machine1 to machine2 via SERVER? Client machines are linux mint. SERVER is ...
Eugen Konkov's user avatar
2 votes
1 answer
141 views

Custom nameservers over wifi hotspots with initial web login

I have built a portable router using a raspberry pi. My setup works, unless I connect to a hotspot that requires some kind of web based login. After some investigation, I think I've tracked it down ...
simonwjackson's user avatar
2 votes
0 answers
839 views

OpenWRT sending invalid packets to WAN when Android phone connects

I have a Netgear WR703N wireless router flashed with OpenWRT 12.09 "Attitude Adjustment" connected to my school's Ethernet network, and our IT department sent emails alerting me that it's "...
twisteroid ambassador's user avatar
2 votes
2 answers
2k views

I can't access URL on my own server, but others can

I have a server running webcams at 96.30.159.42:8081. If YOU click on this address you will see the 3 cameras I have set up. If I enter that address (or click on they hyperlink on my webpage), ...
Bob's user avatar
  • 29
2 votes
2 answers
306 views

Port based routing, 1 public mapped to multiple private ips

Simply put, I want this single public ip mapped into different private ip's based on port 111.1.1.1:80 -> 192.168.1.1:80 111.1.1.1:443 -> 192.168.1.2:443 is this a standard and possible?
user1735120's user avatar
2 votes
1 answer
3k views

How to forward ports through ssh and nat to another machine

I have a problem when using ssh port forwarding and nat simoultaneously. Situation: Machine A runs a webserver on port 8080 Machine B is a raspberry pi which works like a little router. It has two ...
Dominik's user avatar
  • 21
2 votes
0 answers
976 views

Tunnelling TCP connection through NAT

My server is in my school's NAT and my desktop computer is in my home NAT. I want to SSH to my server from home. I normally used school's VPN, but recently for some reason I can't. So I'm looking for ...
Wu Yongzheng's user avatar
2 votes
0 answers
116 views

Turning Computer into Router,Network Address Translation encryption.?

I have windows seven and am using connectify. but when i try to connect to the interner through my ethernet court in my dorm room the comp0uter doesnt recognize the ethernet cord. I belive that the ...
user1754847's user avatar
2 votes
0 answers
224 views

Is there a decent diagram of packet flow for a modern era (2.6+) iptables setup?

I'm currently trying to debug a particularly hairy set of DNAT based iptables rules (the UDP reply never makes it back to the original requester) and I'm struggling to visualise the packet flow ...
stsquad's user avatar
  • 499
2 votes
0 answers
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Linux VM can not connect to the internet

I'm trying to set up an virtual server with connection to the internet. When I start a ping to the local network, there are no problems. When I try to ping an address from the internet, it shows that ...
bitrevolution's user avatar
2 votes
1 answer
2k views

Linux PPTP VPN and gateway woes

I have an Amazon Linux machine running in an Amazon EC2 instance. I am connecting to my office's VPN as follows: sudo pppd pty "pptp pptp.<DOMAIN>.com --nolaunchpppd --loglevel 2 --debug" file ...
user1058765's user avatar
2 votes
0 answers
1k views

After NAT how to setup VPN in windows server 2008 r2?

We have one windows server 2008 R2 with about 10 Hyper-V virtual machines. We've used wizard that comes when you enable RRAS to setup NAT, so that virtual machines can connect to internet (and to ...
This is it's user avatar
2 votes
1 answer
1k views

Change the NAT setttings on mobile dongle

Is it possible to change the NAT type on a mobile dongle modem? I've searched the web but couldn't find anything. Should I contact the ISP for this, is it even possible. At the moment it is set as ...
codys-hole's user avatar

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