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.

learn more… | top users | synonyms

1
vote
1answer
569 views

Connect KVM virtual network to internet

I have a CentOS server running KVM and need to connect a virtual network to the internet. The network must be routed or NATted, it must not be bridged (port security). If possible, I would like to ...
1
vote
1answer
141 views

Open VPN redirect all trafic from TAP/tun interface to netowrk interface

I want all my traffic redirected to the OpenVPN tunnel. I used the directive push "redirect-gateway def1" but the Tap interface on the server is not routed to the internet. How can I do it on ...
1
vote
1answer
642 views

Virtual box linux routing

Sorry for the basic question but I cant figure this one out. I want to set up a small network of linux servers for testing purposes. So I have a host server running virtual box with the following ...
1
vote
1answer
229 views

Linux ( Fedora 15 ) multiple ISP and NAT routing

So I have my system running Fedora 15 and currently with a DSL line. The line provides a static IP along with static route, DNS. I run a web/E-Mail/DNS server from this IP. It also supports a NAT'd ...
1
vote
1answer
567 views

pfsense firewall filter rules behind nat?

i am new in pfsense i have vmware which pfsense and windows xp are installed on them pfsense in using ip 192.168.44.1 for LAN and 192.168.121.129 for wan (which is NAT) my win xp ip is 192.168.44.2 ...
1
vote
1answer
306 views

port forwarding to access services on servers behind NAT

I have some security camera systems in different locations, each location does have internet, the ISP is NATing all the IPs so theres no way to open ports to my systems. My solution was to rent a VPS ...
1
vote
1answer
313 views

NAT and ISP Subnet when load balancing on pfsense?

I have a pfsense box that I'm trying to plan the configuration for. I am going to be load balancing two ISP's, each with their own /29 static IP subnet. The question I have is in relation to the way ...
1
vote
1answer
84 views

NAT ports - how do they work?

I have the following network schema: Computer A: three nics: NIC 1 (eth0): dhcp, public internet NIC 2 (eth1): static 192.168.1.1, gateway for Computer B NIC 3 (eth2): static 192.168.2.1, gateway ...
1
vote
1answer
101 views

ASA permit only one host to *.xyz.com

I want to allow a host to download some updates from *.xyz.com (in internet). How should I permit only this host from my inside network to access *.xyz.com on ASA, access can be via http? At moment ...
1
vote
1answer
536 views

iptables and virtual machines of KVM, no ping, no ssh from VMs

Hi everyone :) I have two virtual machines KVM. I did two alias to eth0 - eth0:0 and eth0:1 and put them on an external IPs (eth0:0 - 89.114.122.3, eth0:1 - 89.114.122.4)​​. Now the problem is: ...
1
vote
1answer
989 views

how to setup sonicwall tz210 to port forward packets received from external ip to another external ip

i have a sonicwall tz210 on a fixed ip, say ip1. And then i have, let's say a legacy server, with external ip ip2, which sends data to ip1 (and I have another server on ip1 behind the sonicwall which ...
1
vote
1answer
438 views

iproute and nat across devices

I've got the following configuration: vlan123@eth0 - range 1.2.3.0/24, with 1.2.3.4 assigned to it br2000 - range 10.2.3.0/24 In the ip route I see: 10.2.3.0/24 dev br2000 proto kernel scope link ...
1
vote
1answer
378 views

NFS proxy / re-export

I have a situation where I need to mount a few NFS shares on a series of clients on replicated VM networks. So their source IP addresses are not unique. In between the client and the server there is a ...
1
vote
1answer
914 views

Reverse NAT Setup for Hyper-V on Win 2008 R2

I'm trying to setup a Linux server behind a Windows Hyper-V host that will help supply some of the services (SSH, HTTPS, etc). However getting RRAS configured for reverse NAT (port forwarding) turned ...
1
vote
1answer
402 views

Inbound connections using Internet Connection Sharing in Apple/Mac/Leopard

I have a Mac mini which I'm using to give some other devices wireless access, by sharing it's Airport connection with the local ethernet, and that is plugged into a switch. All devices can get online ...
1
vote
1answer
166 views

Load balancing + NAT issue on BNT GBE 2-7 gear

I've got troubles configuring an Hardware load-Balancer with NAT functions. I have the following architecture: Internet ===> VIP (public) LB (private ip) ====> private addressed servers When a ...
1
vote
1answer
319 views

If I suspend and resume my vmware host vista box, I have to restart the VMware NAT service or my guest Linux DNS requests won't resolve

If I suspend and resume my VMware host (Workstation 6.5) Vista box, I have to manually restart the VMware NAT service or my guest Linux (Ubuntu) DNS requests won't resolve. I can ping boxes on the ...
0
votes
1answer
26 views

Connecting to an AWS RDS behind a NAT with an SSH tunnel

I've set up a MYSQL RDS on AWS, in a private VPC behind a NAT. With Workbench, I can connect successfully from a remote client into the RDS no problems - so all of the RDS, the NAT and the security ...
0
votes
1answer
43 views

Forwarding IPs to Switch for NAT

I have a Question. We actually have a Cisco 1812 Router and we're Switching to an ASA 5512-X. The Problem is, the ASA 5512-X only has 6 Ports. The 1812, had 8. All in use. We need to translate 3 ...
0
votes
1answer
78 views

Watchguard, accessing server with public IP from internal network

I can't go trough it. I need access from my internal network to a server with public IP. I have private network with few VLANs, and then I'm using Watchguard m400 firewall. The server, that I want to ...
0
votes
1answer
22 views

How to mapping ports from a single public IP to multiple internal servers in Fortigate Firewall?

I have one public IP and I want to use it for 3 servers behind Fortigate Firewall, two for RDP and one for Mail server. I can NAT one public ip to one private local ip but I can not NAT to Multiple ...
0
votes
1answer
44 views

When I ping local IP address I get a reply from external IP

I have SonicWall NSA 2400. Port X2 is WAN port with following settings X.X.X.250 / 255.255.255.248. I connected VPN concentrator to port X5, which is assigned to DMZ zone in Transporarent IP Mode for ...
0
votes
1answer
32 views

Assign WAN IP on internal NAT network

I have a static WAN IP address (in the example 77.88.99.166) that is provided by a DSL modem that also has a static IP address (77.88.99.165). The modem interfaces with a firewall/NAT router (green) ...
0
votes
1answer
50 views

Amazon Linux - iptables NAT rules not matching GRE traffic

I'm trying to prototype something in AWS VPC/EC2, but I can't get my NAT rules to work. I have the following setup (all instances running the Amazon Linux AMI): GRE Tunnel between instances ...
0
votes
1answer
41 views

VoIP: No audio, local IP in SIP header

I'm trying to get SIP trunking to work on my Bintec Elmeg hybird 130j with sipgate.de as trunking Provider. So far, call signalisation works fine, so I can call outside phones and also get called ...
0
votes
1answer
23 views

Azure NAT blocking connections

When I try to connect to a port on the public IP address of a node, 50% of the time Azure doesn't respond and nmap marks it as "filtered". When I try to connect to the same port from the node using ...
0
votes
1answer
53 views

Cannot SSH to ec2 instance in VPC

I'm just starting with AWS, and have 2 ec2 instances running on a VPC, one with a public and private IP, one with only a private IP. I can SSH to both (using my key) if I attach an external IP to ...
0
votes
1answer
41 views

Iptables won't redirect

I'm trying to redirect all tcp traffic on port 102 from a single ip address to another ip address and want to masquerade the ip as well im using this iptable config, but still i cannot connect. ...
0
votes
1answer
22 views

public tunnel into private behind-nat machine

Say I have a web server running on my local machine which is connected to the internet but behind NAT (let's just assume it cannot be reached directly from the outside but It can open TCP/UDP ...
0
votes
1answer
121 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 ...
0
votes
1answer
44 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 ...
0
votes
1answer
235 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 ...
0
votes
1answer
53 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, ...
0
votes
1answer
63 views

Determine internal(LAN) IP address based on external connection port

We have an external VPN server; somebody within the LAN has connected to it, and I can see the port they connected through (ie. the NAT port the router set up for them). Is there any way to find the ...
0
votes
1answer
102 views

route output traffic from specific NAT'ed VM via ip alias

In a dedicated server with several containers behind NAT, I'm trying to route the output / outbound traffic from one of the containers through a specific virtual interface attached to the main ...
0
votes
1answer
263 views

Route traffic through private IP for only certain hosts - CentOS 6.6

I am having a weird problem which I cant figure out - so I was hoping someone here could give me a hand. First off the end goal is that a specific server in my network runs an IPSEC connection to ...
0
votes
1answer
769 views

Cisco IOS, Multiple WAN & Port Forwards (Outside -> Inside PAT)

I have been trying to work out how to accomplish PATing from Outside to Inside on a Cisco IOS router, in this case specifically a Cisco 2901 running IOS Version 15.1(4)M1. Firstly, the problem I am ...
0
votes
1answer
80 views

Windows translate external IPv6 to localhost IPv4

I have a machine running Windows server 2012, whose external IPv6 address is "2a01:4f8:190:7449::4". Let's assume it has no external IPv4 address, so the v6 address is the only way of accessing it ...
0
votes
1answer
252 views

c7200 IOS 15.x-x NAT/PAT issue

My problem may be just finger trouble, but after fighting with this for a day on what should have taken 5mins, I am getting fustrated. I am not Cisco Certified at any level, just a fair amount of ...
0
votes
1answer
104 views

Windows Server as a PPTP Gateway

I have a Windows Server 2012 server at work, which is currently used as a domain controller, and an internet gateway. The current internet connection uses a USB dongle, which appears like a standard ...
0
votes
1answer
288 views

Cisco IOS - Problems with NAT and port forwarding

I have a problem forwarding ports. I have configured a NAT pool of 1 address (192.168.5.2) and assigned that address to the WAN interface. I assigned networks to the access-list, and bind the two ...
0
votes
1answer
411 views

Use Openswan / IPSec on Ubuntu server to connect to existing Openswan VPN - NAT broken

I have an existing Openswan VPN, all working fairly well with Windows, Mac and Phones. [Office 192.168.0.0/24]---[VPN A.B.C.D]----[Internet]---[Home Routers (NAT), Dynamic IPs]----[Workstations] Now ...
0
votes
1answer
75 views

iptables port forwarding from public ip but not from 127.0.0.1

i have an issue with my network setting and i need a port forwarding a bit advanced. I need : - All packets that arrive on my public_ip on port 54321 to be forward on port 12345 but i don't want any ...
0
votes
1answer
222 views

How to start with IPv6 subnetting on linux gateway

We are currently having perfectly working IPv4 network with a typical layout - internal network with all servers splitted to VLANs in 10.0.0.0/8 (each vlan is /24) and external network with public ip ...
0
votes
1answer
626 views

How to trace dropped TCP connections?

Trying to help someone with a situation where TCP connections get mysteriously dropped after a few minutes for no apparent reason (this happens even with non idle connections). Both client and server ...
0
votes
1answer
683 views

Proxmox VE: Multiple shared public IPs with NAT configuration

I have a Proxmox VE (v3.3 @ Debian 7 Wheezy) and got 3 public IPs routed to that server. It is my aim to have multiple VMs sharing those IPs using a NAT configuration so that I can forward single ...
0
votes
1answer
109 views

Keep source port for outgoing packets

I have 2 interfaces eth0(192.168.0.1) and eth1(10.1.1.15). And I do nat for all packets in this way. iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE Now I want to keep source port ...
0
votes
1answer
216 views

IPsec VPN Site-to-Site: Unable to reach hosts on same subnet as gateway

I am trying to bridge an office network with an Amazon VPC cloud network. So far everything seems to be working, except that I cannot reach servers on the same subnet as the cloud gateway. Office ...
0
votes
1answer
112 views

VPN routed traffic, response goes outside of VPN?

Here's a weird one. Whenever I'm on a hotel network I tend to like to route all my traffic through my home network. Mainly since I'm not entirely sure all my passwords go through SSL all the time. ...
0
votes
1answer
634 views

Trouble with port 80 nating (XenServer to WebServer VM)

I have a rent server running XenServer 6.2 I only have 1 public IP so i did some NAT to redirect ports 22 and 80 to my WebServer VM. I have a problem with the port 80 redirection. When i use this ...