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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13 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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0answers
9 views

elastix remote agent audio proble [on hold]

I am suffering with same problem. I have installed Elastix on my Oracle Vbox and using DDNS for my remote agent. It work fine in LAN but if am at the remote agent side there is the audio problem. SIP ...
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0answers
7 views

Virtualbox - how to custom NAT and port forward? [migrated]

How can I use Virtualbox custom NAT and also port forward? For demos, I am running my VMs behind NAT on my laptop. If I run it in the vanilla NAT mode, then each VM I spin up automatically gets ...
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0answers
10 views

Sipwitch NAT STUN

I am running Sipwitch on ec2 and I am able to connect two clients (1 microsip and 1 Phonerlite), but when I dial 201 from 202 extension, the call gets disconnected after 15-16 seconds. I learnt this ...
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3answers
25 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 ...
2
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2answers
44 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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0answers
36 views

How to setup NAT to work with ESXi 6.0

Edit - To cut a long story short, we assume that it is not possible to use vsphere with only a single subnet and DHCP range. We would need to purchase a router to create a second network. We have ...
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1answer
19 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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0answers
29 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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0answers
24 views

Total no. of hosts with 2 NATs in the whole network [closed]

How many hosts we can have with two NATs in the whole network if in IPv4 all the ip addresses are allowed to assign to a host in the network.
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1answer
45 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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0answers
20 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 ...
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0answers
16 views

Forward URL on cisco ASA 5505 [closed]

We have a remote support software that is hosted on one of our servers. Currently you have to put the port number after the public IP to access it. I'd like to have it run on port 80 and direct a url ...
0
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0answers
19 views

Asterisk : SIP/2.0 401 Unauthorized : same phone , different results

First of all I have already taken a look at similar questions such as : http://serverfault.com/questions/392979/asterisk-sip-2-0-401-unauthorized or Asterisk 401 Unauthorized when trying to register ...
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1answer
17 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
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1answer
26 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 ...
1
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1answer
18 views

pfsense with 4 WAN IP and outgoing NAT

I have a pfsense with a single wan ip, i want to assign multiple wan ip's. The pfsense machine is located on a vm machine with the other servers i wish to NAT forward. I want to give each server a wan ...
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2answers
63 views

Access internal ip (home server) through double NAT (router + ISP) [closed]

I have home server (debian-like machine) inside my wifi-network. I wan't to access it over http (for transmission-daemon web interface) and over ssh (to administrate it). The issue is that there are ...
1
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0answers
88 views

AWS yum does not work from private subnet (does work from public)

I have a VPC with a private and a public subnet - each containing an identically built RHEL7 server. I believe the VPC is set up correctly (see following). However, the public server can use yum and ...
3
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1answer
40 views

Reaching out DHCP relayed hosts

I have one primary server (DHCP) and one secondary (DHCP-RELAY). Majority of hosts are served from primary (wirelessly), however there are a few (wired ones) which get their IPs from secondary. ...
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0answers
28 views

smartos route between zones through external ip

I have three zones - nginx(reverse proxy), jetty(webserver), and curl. I want to reach jetty from curl through nginx. When I do curl from external ip I could reach jetty through nginx, but not from ...
1
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1answer
49 views

Iptables udp port forwarding [duplicate]

I'm using latest debian relese and i need to do some port forwarding, but i dont know how.I have 2 stream sources coming to my server on the same udp port from 2 diferent ip-s 192.168.1.2:1003 via ...
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33 views

SNAT traffic through tun interface

Here is the diagram of the network : Internet -----eth0(WAN), tun0 (GATEWAYPC) eth1(LAN)----- UserPCs Network interface : eth0 : WAN, DHCP tun0 : OpenVPN Client tunnel IP:10.0.0.9, ...
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0answers
23 views

Cisco 5512-x TCP request discarded

We have a fairly basic ACL and NAT rule allowing RDP inbound and NAT'd to a LAN IP (all IPs replaced with IP) object network STATIC-PAT-RDP host IP access-list outside_access_in extended permit ...
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0answers
10 views

AWS IIS web instances behind load balancer needs net access [duplicate]

I have a public subnet (10.10.1.0/24) and private subnet(10.10.2.0/24) in my VPC. I've setup a nat instance in my public subnet to provide outbound web access to all private instances. I have a load ...
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0answers
7 views

Can a host be both an IPA client and IPA server

I have a public network that includes hosts with private networks. I would like to manage all of the hosts via IPA. I have looked into managing hosts on the private network via the public IPA server, ...
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0answers
32 views

Cisco serie 4400 internet configuration with low performance

The issue: I have been trying to set up the network on a cisco router. It is working, however it is very slow. The configuration: Gi0/0/1 is connected to internet (ip 100.38.214.2, gateway is ...
2
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2answers
59 views

Exposing private network ip

I have the following setup: Box A eth0 - 192.168.1.101 eth1 - 10.10.2.1 Box B eth0 - 10.10.2.2 Box A has internet access through eth0. I want Box B to be visible on the 192.168.1.0/24 network, so ...
0
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1answer
25 views

pfsense: connection between two internal lans dropped after 20 seconds

I have the following config: LAN 01: 192.168.16.0/24 (LAN for internal servers) LAN 02: 192.168.67.0/24 (LAN for workstations) WAN: X.X.X.X And then: PFSENSE LAN IP: 192.168.16.1 PFSENSE LAN IP: ...
1
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1answer
29 views

IPTABLES -L OPTION NOT SHOWING SNAT RULE

I am able to get NAT to work using the following snat rule: iptables -t nat -A POSTROUTING -o em2 -j SNAT --to 192.168.2.2 My question is: Why is this rule not displayed when I issue the ...
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0answers
28 views

Cisco 1921 router stops routing traffic

I have a cisco 1921 router that recently started acting up. I haven't changed anything on the router in many months because everything was running smoothly, until a week ago. Configuration: The setup ...
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51 views

How to set up Iptables SNAT with dynamically assigned public IP address

I am trying to set up a system to do NAT and other iptables-stuff (like logging, firewall, monitoring, etc.). The ISP provides a dynamic IP address and the DSL modem does NAT. I have the following ...
0
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1answer
78 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 ...
1
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0answers
30 views

iptables foward to multiple interfaces with NAT

I want to use iptables for provide NAT translation and forward the packets out a different interface. The network set-up is as follows: Alias: eth0:220 with IP address 10.1.1.220 / 255.255.252.0 ...
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3answers
105 views

Why can i not ping my host behind the firewall. Cisco asa 5505 [closed]

Can anyone please help me to figure out what in my configuration of the Cisco asa 5505 is wrong or missing. I have multiple host behind my firewall these hosts run different websites on port 80. I am ...
1
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1answer
48 views

How the firewall is allowing Facebook requests to bypass itself?

I've a McAfee Firewall configured at my workplace. It actively blocks all the requests for websites like https://www.Flipkart.com https://www.Amazon.com https://www.Facebook.com I's playing ...
-1
votes
1answer
43 views

Routing between Two Host-Only Networks [closed]

I have two routers on VMWare workstation, Router01 and Router02, both are set up as Host Only Networks. I need to route between the two networks, so that from Router01 I can ping the public endpoint ...
0
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1answer
82 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 ...
4
votes
0answers
75 views

Why would you internally use NAT? [closed]

I work at a fairly huge company as a software engineer and I would like to understand why an enterprise would internally use NAT. We have several data centers, somewhat geographically close to each ...
2
votes
2answers
58 views

RRAS Server 2012 R2 Not Assigning Network Info or if it does not passing NAT

I wouldn't bother with this for any other reason than the fact that the speeds I get are worth it. Cable Modem (Bridge mode) - Server 2012 R2 (RRAS) - Linksys EA2700 (Bridged as Switch) My issue is ...
0
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0answers
31 views

Kerio Control Static Route issue

First of all, thank you for reading this and trying to help me with this issue. I have a Kerio Controll installed in premises in NAT mode with two NICs. LAN: 192.168.1.7 WAN: x.x.x.x I have added ...
0
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2answers
63 views

Accessing server without port forwarding

First of all, I know this question has been asked before It seems, however, that none of these yet have a full solution. My question is essentially the same. I have a device connected to a wifi ...
0
votes
1answer
28 views

OpenVZ container(s) and NAT

I have been trying to days to solve my NAT issue with OpenVZ. I have used their guide on their website/wiki, however I just seem to be unable to get it to work. My Linux box is running on CentOS 6 ...
1
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1answer
83 views

DirectAccess: Client receiving icmp error from Ipv6 address

Pardon my naivety but I have never setup DirectAccess before, I've done some research prior and was unable to find a relevant resource. Let me provide a little background and then I'll jump into the ...
1
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0answers
93 views

Virtual IP Pool for NAT with StrongSwan VPN

I'm trying to wrap my head around a site-to-site VPN configuration using StrongSwan that will allow remote sites to connect to our AWS VPC. The catch is, the remote gateways will potentially be using ...
1
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4answers
206 views

Cisco ASA Implicit rule dropping traffic

The network is as follows: Two Default Gateways exist on the network - one which provides connectivity to the an MPLS with several subnets. Let's say 10.0.0.2 Another which is a Cisco Firewall, on ...
1
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2answers
43 views

Watchguard VLAN Head-Grasping needed

I am trying to wrap my head around setting up my new watchguard M400. Here's what I need to figure out and what I've done so far. My ISP provided me with a P2P IP, which I plugged into my interface ...
1
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1answer
63 views

iptables can't NAT multiple IP addresses

I have a server with two network adaptors: eth0 and eth1. This server is running two distinct https webservers: One is listening on eth0 (172.29.49.112:8443) The other is listening on eth1 ...
0
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0answers
64 views

Modify iptables rules when docker container has started

On my debian host I have a few docker containers, which I ran with -restart=always so, they start after host has rebooted. Some of them have exposed ports, and docker host process adds certain ...
0
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1answer
34 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 ...