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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Iptables not routing GRE protocol

First things first, there might be a few English errors, considering it's not my native language. I'm having a problem with VPN(GRE protocol) passing through Iptables. I've done this at least a dozen ...
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67 views

access local network shared folder from the internet

I have a problem with my network configuration. I would like to access a folder that is in my local network and mount it on a public server. I have a VSERVER in local network (10.50.1.25) I have two ...
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2answers
155 views

Can I access a NAT addressed host behind a gateway from the WAN side without DNS or VPN (with DNS if it's not possible)?

I have a very simple gateway running a minimal Linux which is serving as an IP router with NAT and DHCP on the LAN, and a static IP on the WAN. The gateway router from the LAN side goes to a big ...
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2answers
56 views

iptable alternatives debian VPS

i am confused that i dont find any soloution... i will configure an reverse proxy and that with iptables for my gameserver on debian: Kernel: 2.6.32-openvz-042stab108.2-amd64 iptables -t nat -A ...
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1answer
57 views

KVM guest static ip with ports forwarded to another guest

Im on host-machine with Centos 7 and 2 guests on Centos 6.6. I want one of my guests have static external ip but some his ports must be routed to another guest. On host machine I do: iptables -t nat ...
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110 views

VMware ESXI Behind ASA5506-Xs using Public IP is Not Communicating

Here is the lay of the land. Everything works but I cannot get data flow from ESXI Server or it's VM's I want them using public addresses from behind the router. The Vmware ESXI Hypervisor on a Bare ...
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1answer
215 views

Vyatta and DNS Rewrite (aka hairpin or doctoring)

I'm trying to make my public IP reachable also from inside LAN. I know that it's better to spilt DNS in order to have an internal zone that solves hosts with internal IP, but for a lot of reasons ...
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259 views

Asterisk SIP Retransmission timeout after a month of server uptime

This Asterisk server runs fine behind NAT with a dozen of SIP registrations and the call volume of a few hundred calls per month. But then, after about a month of uptime, out of the blue the SIP ...
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1answer
882 views

pf (Mac OS X) rule to redirect all traffic to a specific ip/port

I'm trying to recreate this iptables setup (from https://github.com/darkk/redsocks) with pf: iptables -t nat -A REDSOCKS -p tcp -d 10.0.0.0/8 -j REDIRECT --to-ports 12345 iptables -t nat -A OUTPUT -p ...
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1answer
126 views

Use multiple WAN IP addresses on a single VLAN

Our ISP has given us a /25 range of IP addresses on our lease line. We want to be able to create several VLAN's and direcly assign each VLAN with any number of these WAN IP addresses. For example - ...
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110 views

Dual WAN and NAT on ZyWall

I have Zyxell ZyWall USG-50 router firewall and I want to configure dual WAN navigation. On WAN1 I've 10Mbits connection and on WAN2 I've 100Mbits connection. I want my LAN to navigate with WAN2 and I'...
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1answer
73 views

Why does iptables not doing DNAT for the same subnet? [duplicate]

I have the following NAT setup: +--------------+ +-----------------------+ +-------------------+ | | | | | | | | ...
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1answer
769 views

Asterisk does not use externip

I am trying to setup a cloud Asterisk server that is behind a NAT with the hello-world example. I have NAT issues. The IP address Asterisk is supplying to the client through the SDP is its local ...
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1answer
253 views

How can I do site-to-site OpenVPN routing without NAT

I have two OpenVPN servers at different location. Each machine in one location can ping and connect to every machine in the other location. My problem is when I use SSH to connect from machine A in ...
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0answers
15 views

Mikroti - route between 2 public adresses

I have 2 public addresses on mikrotik. Both using nat, but first is for normal users and second is for servers that I use on public network. I need to connect to second ip and services behind second ...
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0answers
67 views

IP forwarding issue in SLES12

I'm triying to configure iptables in SLES12 in order to route packages between two machines. This is the scenario. I want to connect from A to C using iptables and ip forwarding on machine B ...
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0answers
108 views

PFSense NATing to a load balanced server

I apologize for not being able to post the network diagram here but as this is my first time asking a question here I am not allowed. So here is the scenario: We have a site that is build with a ...
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1answer
82 views

External IP becomes unreachable sporadically

I have a very strange problem - We have a lease line with 50 odd external IP addresses on it. We do a 1:1 assignment and Outgoing IP assignment to interfaces on a pfsense proxy server. For each ...
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108 views

NATing with windows server 2012

Greetings and thank you in advance for your help, My setup is just like this: computer 1 Windows 8.1 with one interface configured like the following ipv4 : 172.19.209.130 mask : 255....
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1answer
276 views

Original IP lost with IPTables NAT to another server

I'm trying to forward all HTTP traffic from one EC2 linux server (external IP 11.11.11.11) to another one (external IP 22.22.22.22), these rules set: sudo iptables -t nat -A PREROUTING -p tcp --dport ...
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164 views

How to get Ipv4 in NAT mode & Ipv6 in bridge mode together in Xen 4.4?

Here is my problem with Xen 4.4 wth Debian 8, i have one Ipv4 address & plenty of Ipv6 addresses. I would like to setup xen for NAT to route IPv4 to a private network and bridge with Ipv6 ...
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1answer
602 views

Troubleshooting “Network is unreachable” from within an Amazon VPC

An EC2 instance is running Amazon Linux in a public subnet in a VPC. Here are the outbound rules for its security group: ALLOW TCP on port 80 to 0.0.0.0/0 ALLOW TCP on port 443 to 0.0.0.0/0 ALLOW ...
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224 views

How can EC2 internal (10.X.X.X) IP addresses be mapped externally?

On our work internal network we've got a link to an Amazon domain. One of the servers we're talking to is: 10.29.112.X. Now this address starts with 10, so I expect it is an internally mapped ...
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1answer
59 views

Dynamic NAT configuration

I am using two routers and one host (computer), I connected fast Ethernet 0/1 of router A with the host and fa0/0 of the router A with the router B I have configured gateway as last resort on both ...
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1answer
62 views

Iptables DNAT working in my own network, but not through VPN

For some reasons I need to switch a server ip to another ip, in order to be seen by another computer elsewhere through vpn. So I'm using iptables (didn't know any of that until yesterday) and testing ...
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1answer
707 views

Can't get voice after changing Asterisk UDP port

Test environment consists of a CSipSimple client, Asterisk server and a router with NAT. Formerly the equipment used UDP port 5060 and everything was good. Then I changed port number to 15000 in ...
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1answer
59 views

Hyper V and NAT Redirect IP on different VM

I have 2 IPs public (but one physical network port) and i want redirect IP public 1 on my VM 1 and, IP public 2 on my VM 2 But when i check my NAT configuration i can just redirect port on my interne ...
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704 views

ASA 5505: How do I access the DMZ web server from the inside using the public IP?

We are using a 5505 ASA Sec+ (8.2). There are three interfaces: inside (172.17.0.0/24), dmz (172.16.0.0/24) and outside (1.2.3.4 for the example). There are static NAT rules set up translating 1.2.3....
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29 views

Routing and VPN Setup

The network setup is as follows: Router: eth0 1.1.1.1 (outside) eth1 192.168.54.4 (inside) eth1 10.54.4.4 (inside) Cisco ASA5505 192.168.54.1 (inside) 10.54.4.1 (...
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1answer
110 views

NAT TCP/UDP Connections With iptables on AWS

So I've got 2 instances on AWS set up so I can SSH into them directly (A, B) from my home machine C. But I want to set up box A so that I can forward certain UDP and TCP connections from it to box B. ...
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1answer
111 views

Cisco Router NAT does not work

I have an active internet connection from provider on festethernret0 and also have vlan1. I need to have an internet connection from festethernret0 to my vlan1. I am doing it this way: access-list 2 ...
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1answer
364 views

CISCO - organize NAT with 2 WANs, 2VLANs and failover (using PBR / ip SLA )?

We have a CISCO 800 series connected to 2 WAN channels, and 2 VLANs. The idea is to have VLAN1 always use WAN1 channel, and VLAN2 use WAN2 channel, but in case of connectivity failure switch to a ...
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1answer
34 views

On a Linux NAT host, late duplicate segments cause connection resets

https://www.cloudshark.org/captures/6f185eb12e97 172.30.5.1 Linux vm with bridged networking, running on another server, VM has RFC1918 address only 144.76.103.194 Linux host ...
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1answer
502 views

Network issue with Centos 7 [closed]

I've just installed the minimum install of Centos 7 in VirtualBox. When trying to ssh from my local into my VM I realise the VM is on a different gateway / ip range. My home network is on 10.0.1.x ...
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1answer
55 views

Rate-limiting & dropping natted packets, EXCEPT for 5 local networks

Basically, I am trying to rate-limit requests to a mailserver at the firewall level, but whitelist several company-owned IP ranges. I can whitelist one IP addresses range, but not several, because of ...
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0answers
111 views

Cisco ASA 5505 no NAT

I have a cisco asa 5505. The outside and inside IPs are private IPs so I do not want to NAT the inside IPs as they go out the Outside interface (there is a router upstream of the ASA 5505. Would I do ...
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votes
1answer
54 views

Connecting an Azure VM to active directory domain behind ISP NAT

I have an active directory local domain set up with 2 DC's running DHCP and DNS. Because my ISP uses NAT there is no way to host services externally. How can I link an Azure VM into my local active ...
2
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2answers
900 views

Linux Routing with two NICs (LAN vs Internet) with NAT and bridging for VMs

My Setup: There is only one physical machine in this setup, a Host System for Virtual Machines (VMs) with two network adapters. One NIC (eth0) is connected to an internal network (LAN subnet, e.g. ...
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1answer
196 views

Port Forwarding with Cisco SR520 IOS

I've been tasked with setting up port forwarding for access to remote desktop on a server. I'm having trouble making it work. Server IP 192.168.1.20, port 3389 The router is a Cisco SR520. It is ...
2
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2answers
789 views

Trying to connect to servers in a remote lan with softether vpn client and iptables nat ip_forwarding

I have implemented a softether vpn server on one aws server connected to other instances in a LAN. I can ssh into the server with ssh myname@10.0.1.10 without problem. I followed this guide My goal ...
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1answer
594 views

Sonicwall HTTPS management from LAN using WAN IP

I'm trying to enable https management of our Sonicwall NSA 220 wireless-N from the LAN interface, but browsing to the WAN IP. This is because: we also need WAN side management we don't have VPN set ...
1
vote
1answer
134 views

VPN problems: MTU and Don't-Fragment

I am setting up a VPN on Ubuntu 14.04LTS which uses IPSEC and performs NAT for clients. It is basically working - I can connect to it from a clinet (Android device) and browse (for example) www....
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1answer
1k views

How does TeamViewer get through my firewall even though I set it to “No incoming connections”? [closed]

Here is my firewall settings: Clearly, firewall is on for both private and public networks and it is set to "Block all connections including programs on the list of allowed programs". I did not ...
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35 views

Network syslog with port number

I am collecting syslog from VoIP phones over the network and it is usual having several phones behind same NAT device. I need to collect syslog files to different files or be able to differ lines ...
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3answers
90 views

Ubuntu / iptables: Using a server as middle-man to talk to firewalled server [duplicate]

I have a situation where I need to communicate with an API that only allows connections from one particular IP. So api.example.com accepts connections on port 443 from whitelisted-ip I want to be ...
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2answers
310 views

How do I send network packets from an ipv4 address (with port forwarding) to an ipv6 address (no port forwarding) without STUN?

* I have the following situation: * Bob wants to interact with Alice directly (encrypted interaction, no intermediary server who will forward his packets). Both are behind NAT. Alice has a public ...
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1answer
56 views

NAT forwarding (whole IP) working only on some ports

Since my hoster doesn't allow briged setups I had to go for a NAT solution to run my CentOS VM on an additional IP and my host machine on the primary IP. Now, I've got a problem since for ports 22, ...
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1answer
139 views

How to combine multiple route hops using one (pfSense) router?

I am trying to come up with a way to consolidate two routers into one. I have the following network configuration: LAN <-- a/24 --> NAT Firewall <-- x/29 --> Router <-- y/30 --> ...
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1answer
318 views

why my nat iptables rules dont work with marked packets?

System: debian squeeze, Linux server 2.6.32-5-amd64 #1 SMP Tue May 13 16:34:35 UTC 2014 x86_64 GNU/Linux, iptables v1.4.8 lsmod | grep iptable iptable_security 2176 0 iptable_mangle ...
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116 views

Connecting P2P over NAT?

I started to explore the option of connecting with other using a p2p connection, so I coded a simple socket program in JAVA for android devices in which the user in which the users can share simple ...