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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Forwarding traffic from TUN device (C++ backend) to the default gateway

The following problem is just a piece of the bigger solution I have a problem with. All other elements seem working so far, so I'll try to describe very small piece which I have problem with. I've ...
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88 views

Apache Instance in Private Subnet not returning packets

How can we get the Apache instance in a private subnet to work? Configuration Public subnet with 1 NAT instance Private subnet with 1 App instance Details 1. Masquerading is turned on NAT on via ...
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161 views

Keepalived failover not working for Static NAT target behind Cisco ASA

I've got a Cisco ASA[0] with a pair of Linux boxes in the DMZ running Keepalived and HAproxy acting as a load-balancing failover pair for another pair of Windows servers, also in the DMZ. I'm ...
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224 views

Openstack seems to not map internal IPs to local network properly

I have a very confusing issue which I can't seem to resolve. I followed a guide by Loic Dachary on installing Openstack Folsom on Wheezy, and deployed it on two hosts: a cluster node, and my ...
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134 views

Martian Source & Servers losing network

First off, I am pretty new at diagnosing network issues through linux. I have an intermittent problem with our LAN servers. They seem to lose all connection to the network and if I disable the adapter ...
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1k views

NAT64 configuration with tayga on Debian 6

I'm trying to implement NAT64 with tayga on my server and came to a point where I'm not sure how to proceed. My server is connected via one IPv4 address and one /64 IPv6 address block to the ...
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316 views

NAT not working after enabling DirectAccess

following test setup is given: server1 - 1 network card connected to internal network (10.0.0.2/24) + gateway 10.0.0.1 server2 - 2 network cards (1. connected to internal network (10.0.0.1/24) / 2. ...
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164 views

Virtual guest doesn't NAT when using the hosts IP

I am using lxc to host some services. I wish to expose one of these services to the outside world. I have setup three NAT rules on my host using iptables, one for the eth0, one for br0 (the bridge ...
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290 views

How to configure opennebula for allowing a cluster private network to host images with public IPs

I am installing open nebula 3.4.1 for running virtual machines a (kvm based) cluster made of 5 computers: a front-end machine having 2 network interfaces and 4 slaves machines with a single network ...
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140 views

How can I specify which IP address is used for outbound traffic in OS X Lion Server with multiple WAN IPs?

I have a Mac Mini Server running OS X 10.7.4 (Lion). I am using the ethernet port for the LAN and I have a USB->Ethernet adapter for the WAN. I have assigned two external IPs to the USB->Ethernet ...
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525 views

Connectivity issues with dual NIC machine in EC2

I'm trying to get some servers set up in EC2 in a Virtual Private Cloud. To do this, I have two subnets: 10.0.42.0/24 - Public subnet 10.0.83.0/24 - Private subnet To bridge these two, I have a ...
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198 views

Two separate WAN uplinks for two different NAT networks

I have a server running ubuntu 10.04 with four interfaces. eth0 and eth1 have static WAN ip's, and eth2 and eth3 are connected to two separate NAT networks 192.168.0.0/24 and 192.168.1.0/24 ...
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856 views

Errror on connecting to VPN-server by Demand-dial interface (Windows Server 2008 R2)

I have several LAN-interfaces and internet access over VPN (connect to provider VPN-server). I want to setup NAT from local area networks to internet. For this I install on Windows Server 2008 R2 ...
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320 views

Route two public (ISP assigned) subnets on 'outside' interface of Cisco ASA 5510

We've got a Cisco ASA 5510 that sits on our edge and acts as the PPPoE endpoint for a fibre connection. The fibre connection came with a static IP, which is assigned via PPPoE, and gets picked up by ...
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58 views

Change sender-IP for VM in libvirt behind NAT

I have a server with my own public /28 IPv4 Network. On this server I have some vServers, done with KVM/libvirt. These vServers are connected with a virtual network, NATed to the internet. Every ...
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64 views

Weird socket behavior in VirtualBox (NAT + PAT)?

I have a Linux VM with NAT and PAT configured. Let's say ports 2000 and 2001 are forwarded to the VM. These ports are also configured for external access on a device such as a router using a domain ...
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48 views

Poor large transfers behind NAT on Centos

I have the following set up. A Centos 6.5 VM running on an ESX host, with a public IP4 address. It is acting as a gateway for (a bunch of) other Centos 6.5 VMs that are only connected to a virtual ...
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2k views

[SOLVED ]Openvpn routing for lan to lan through tun

I am trying to setup an OpenVPN tun to connect two lan's The open vpn connection is up and working but there is a problem with my routing or nat or something. What I need is an example of what a ...
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92 views

Firewall and NAT settings in GSM modem for one server

I have a GSM Modem (PSI-MODEM-GSM/ETH) in field with one device behind, acting as a server. The situation is as follows: "PC" | \_________Dynamic IP: 10.103.153.122 | ...
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72 views

strongswan packet get natted when ufw is enabled

I'm using strongswan 4.6.4 to connect road warriors to my server (ubuntu 13.10), which is natted behind a firewall. left=%defaultroute leftsubnet=10.10.1.0/24 right=%any ...
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52 views

OpenVPN running on Internet Gateway, so all private clients can access VPN with no config

Our LAN connects to our office gateway machine (192.168.1.1), which is connected to the Internet. I have setup NAT/Masquerading for this purpose with no issue. We also use OpenVPN to connect to our ...
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141 views

Simulating a client behind a NAT in Virtual Box

I am trying to simulate a client behind a NAT using Virtual Box. I have a host machine let's say with an IP address 130.0.0.1. I create a virtual machine (let's call it VM1) running Ubuntu 12.04 with ...
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99 views

Port corruption using iptables NAT on Enterprise Linux 6

I am trying to setup a captive web portal redirect on CentOS using the following configuration: This configuration works for the first few packets, but then suddenly the destination port is corrupted ...
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70 views

Cisco ASA ASDM Missing Nat options when creating network object

Hello all hope this is a simple fix. In ASDM of one of our ASA's, when we go to create network object. the NAT options to create automatic NAT rule is completely missing. its just a small box to ...
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35 views

Zyxell USG200 NAT for local computer using wan address

My WAN public address is linked to the server with NAT. How can I set up the firewall to let all local computer use the same NAT rules for www.mypublicaddress.com address from INSIDE the network? I ...
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537 views

How to stop NAT dropping idle connections?

I have a TCP connection that can be idle for many hours. The traffic is flowing from the server to the client only. One might say it's kind of push notification. My home router, however, tends to ...
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71 views

Linux iptables NAT

So I need to setup a server that servers a NAT server for IPMI network xxx.xxx.xxx.xxx = external IP(internet IP) aaa.aaa.aaa.aaa = internal IP A bbb.bbb.bbb.bbb = internal IP B User 1 -> ...
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181 views

OpenStack Server Instances have internet access, but they are unable to access the internal network

I'm running an OpenStack Grizzly release with a Nova-Network configuration. [No Quantium]. My network is setup as follows: OpenStack Box (10.10.13.xx network)->OpenStack Internal Network ...
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520 views

Puppet agent (v3.0.1) hangs connecting to master (v3.1.1) in VM behind firewall (with NAT based access)

I am using puppet agent v3.0.1 (On FreeBSD), trying to connect to a puppet master v3.1.1 (On Ubuntu) and the puppet agent hangs with the following debug output: puppet agent --debug --no-daemonize ...
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466 views

NAT Pooling with IPSEC source int on Fortinet 60c

I've been working on this one for a while, and been trying to figgure it out but now I've been banging my head against the wall.. We have the following setup: Fortinet 60c configured with these ...
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48 views

Nat Traversal, peers unable to communicate

I'm currently working on a project that requires NAT traversal but I seem to be running into difficulty. I have the following setup running for testing: R1, Verizon Fios router connected to the ...
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93 views

NAT Public ip to that many number of pvt ip

i have a Linux box with two interfaces one with ip 10.10.18.2 and other with ip 192.168.1.2,192.168.1.3 aliased. A xen host is connected with ip 10.10.18.3 and gateway 10.10.18.2 to this through a ...
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339 views

How does one configure UFW to allow private DNS requests, but block DNS requests from internet

I have an Ubuntu Server 12.04, with two network cards: eth0 is connected to the internet eth1 is connected to a private network (192.168.10.1) The server is configured as a gateway and hosts DNS ...
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166 views

Cloudmin GPL Xen PV with Nat Port Forwarding

I'm running Cloudmin GPL on CentOS 5 64bit and am trying to allow my Xen PV guest to access the internet via a NAT/port forwarding setup.. I've done the following: (on dom0) echo "1" > ...
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291 views

NAT loopback/reflection on Zyxel P-661HW-D1 doesn't work

I have a Zyxel P-661HW-D1 modem/router with several port forwards that works on the WAN interface. I'd like to make them work for the LAN interface as well, like I'm used to. I updated the firmware to ...
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431 views

VirtualBox - multiple guests, each with a single bridged adapter?

I am running a dedicated server (located at Hetzner, Germany) that runs VirtualBox in order to virtualize several services accross multiple virtual guests. Those guests are supposed to communicate ...
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0answers
104 views

Changing externally visible IP on a multi-IP router?

I work at a public library and I'm trying to configure OCLC's EzProxy software. I've run into a problem and I think it's related to our network config. I'm punching above my weight here a little so ...
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0answers
569 views

Cisco 1841 - Configuration Issue with NAT

We recently dug out an old Cisco 1841 to solve a need and have been in the process of trying to configure it appropriately. Admittedly, this is my first escapade into the land of Cisco Routing. I've ...
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0answers
264 views

iptables dynamic NAT, SNAT: force overload on exhaustion

Is there a way to specify the use of iptables NAT'ing where you can use SNAT for a pool of outside addresses, but when the last IP is about to be used it is used as an overloaded outside IP? I ...
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0answers
386 views

internet connection sharing using NAT or Proxy

I have problems with a proxy auth over a shared network. Config: 1 server with 2 NICs and windows server 2008 r2 NIC_1 = 10.xx.xx.xx AD Internet connection ...
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0answers
246 views

SNAT on windows 2008

I've an openVPN client which runs on windows2008 R2 server and through this windows 2008, I'm trying to do static nat to a machine which lies behind this win2008s real network. Here is my ...
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0answers
253 views

Default Gateway solution on NAT'd network (best options)

I've recently changed a network from a bunch of machines exposed to the net on a network to a more security conscious Firewall-fronted network with a DMZ for public services. Everything's mostly ...
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0answers
1k views

How to make sysctl network bridge settings persist after a reboot?

I am setting up a notebook for software demo purpose. The machine has 8GB RAM, a Core i7 Intel CPU, a 128GB SSD, and runs Ubuntu 12.04 LTS 64bit. The notebook is used as a KVM host and runs a few KVM ...
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346 views

Linux IPsec VPN and SNAT

I'm trying to connect my network to an IPSec VPN, and for this my connexions need to come from a given domain. The network is the following: Internal network eth1:10.0.0.1/14 eth0:1.2.3.4 ...
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306 views

Libvirt/KVM in NAT: can't access from host (and can't forward)

I'm trying to set up a port forward to a KVM guest, managed through Libvirt on Debian 6. The VM is running in NAT, through the "default" network. This all runs fine, the VM has full internet ...
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1k views

Port Forwarding through VBox NAT for SSHing from Host to VirtualBox Guest Not Working

Despite the tremendous amount of work that VirtualBox has put in to make this process easier, I really just cannot get it working properly. The goal: To be able to run a headless VirtualBox VM, which ...
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463 views

Static NAT with 2 ISPs on CISCO router

Our company has a block of real ip addresses 91.xxx.xxx.0/24 and have bgp sessions with 2 upstream ISPs. The problem I ran into is that we need to configure static nat on a cisco router, so that 2 ...
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324 views

how to access virtual machine behind NAT from public network

I have a 1&1 hosting dedicated server (linux centos 5.x with plesk) (IP 74.208.98.x) and configured a nagiosxi virtual machine to run in NAT mode under VMware player 4.0. because i unable to use ...
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114 views

NAT confusion regarding cisco ASA5510

I'm setting up my first cisco firewalls. A little information first:I have two asa5510 setup in a working active/standby pair. From my ISP i have two public subnets. A /29 and a /26. On my DMZ ...
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138 views

VMWare Workstation 7.1 on Ubuntu 10.04 Host NAT Connections Dropping

I hope someone can help me with this issue. We currently have VMware Workstation setup on an Ubuntu 10.04 host with NAT networking configured for the guests (b/c we don't have a router at the servers ...