Questions tagged [nat]

In computer networking, network address translation (NAT) is the process of modifying network address information in datagram (IP) packet headers while in transit across a traffic routing device for the purpose of remapping one IP address space into another.

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Can't connect to Vsftpd Server - Passive reply with unroutable address

I have installed Vsftpd Server listening on port 21 in ubuntu server. I've forwarded a port in my router to forward external port 8500 to internal port 21 where my vsftpd server is listening on. ...
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IPsec client access to LAN of other client

Since my home network is behing double NAT I want to set up a "reverse VPN" from a VPS that gives me access to local LAN from other VPN clients. I have set up a Strongswan IPsec server on ...
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I'm trying to create a loopback in ubuntu for gns3 cloud and nat it to the internet so that, I can run some automation code

Previous script below failed after update: #!/bin/bash #script of commands needed to make loopback interface #for GNS3 cloud! #Create the interface #only needed the first time #sudo apt-get install ...
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Mikrotik - NAT over 2 ports - cant get it to work

I have a problem with setting up NAT over two ports in separate LANs (there is no internet involved in this). Situation description: Problem is that our PBX. It has some crazy network setup with loops ...
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31 views

iptables, wireguard: 2-way routing between VPN and LAN

i am setting-up a VPN using WireGuard and are stuck configuring my firewall on the respective VPN server. I want the following features available: VPN devices (10.6.0.0/24) available from LAN (10.20....
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1answer
37 views

WireGuard: cannot delete iptables rule for default route

since I don't want friends and colleagues in my VPN to use my VPN server as a proxy VPN for "anonymous" surfing, I want to disable the default route for the VPN. In a nutshell: LAN (10.20.0....
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1answer
59 views

Kubernetes: route outgoing UDP traffic through service

My question is about Kubernetes' internal traffic routing and probably about routing / NAT in general. Goal: I'm running a Wireguard service on Kubernetes and I'd like to route all outgoing traffic ...
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2answers
33 views

New iptables NAT produces Error 400 Bad Request for Other HTTP Requests

All: Recently, I added several new iptables (RE: code snippet below) rules to route traffic through my VPN (0x1000/0x1000) for a specific destination (172.67.168.48) over port 443. The new rules NAT ...
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Shorewall SNAT not passing lan traffic to ipsec tunnel

I'm setting up a 20.04 machine with shorewall to allow traffic to one network across an ipsec tunnel. I have done this a number of times on 18.04 and it works fine. The problem with 20.04 is that the ...
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1answer
38 views

UDP NAT traffic but no response on MikroTik RouterOS

I have a MikroTik router with v7.1beta2 firmware installed It's WAN (eth1) has an IP address of 192.168.7.122 There are two devices connected to its LAN Device #1 is a webserver, communicating on ...
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3answers
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Web server with a private IP [closed]

I need an explanation of how to establish tcp/ip connection to two web servers that are on a remote lan network. The web servers have a private IP addresses. Let say of the sites is https://...
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107 views

Postfix behind NAT

my network looks like this: Internet <-> Gateway router(nat) <-> enp0s3 Linux enp0s8(NAT) <-> SMTP server Without Linux NAT it works ok, but I need it. When I try to send mail to ...
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pfSense - Port forward through site-to-site VPN

I'm trying to solve a problem on my setup, and kindly ask your help. This is the scenario. Site 1 Internet connection via 4G/LTE provider, with natted connection pfSense firewall 172.20.0.0/25 LAN ...
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34 views

Weird bandwidth issue with double NAT and Windows clients

I have the following issue and literally tried everything already and cant figure out, what's the root cause of this, how it is explained, and then also how to maybe fix it. Setup: Cable Router 192....
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NAT not working on VirutalBox with kubernetes, PC -> [ VM -> haproxy -> MetalLB -> Ingress controller -> Kubernetes web server ]

Im trying to connect to a webserver deployed in kubernetes, from outside of the vm. I've connected the pod to an ingress controller and gave the ingress controller a LoadBalancer IP via MetalLB, then ...

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