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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9 views

Chinese ISP block incoming ports, how to access home server? [on hold]

My chinese ISP block ALL the incoming ports. I have a 100M fiber internet connection, but obviously the connection needs to be initiated from inside (LAN) to start communicating with outside (WAN). ...
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1answer
30 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
18 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
12 views

Forward URL on cisco ASA 5505

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 ...
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0answers
10 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
13 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 ...
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1answer
21 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 ...
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1answer
10 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
47 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 ...
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0answers
65 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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0answers
34 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
22 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 ...
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1answer
38 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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0answers
26 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
20 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
5 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
29 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 ...
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2answers
58 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 ...
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1answer
21 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: ...
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1answer
26 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
26 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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0answers
47 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 ...
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1answer
65 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 ...
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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
86 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 ...
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1answer
47 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 ...
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1answer
38 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
68 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
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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 ...
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2answers
55 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 ...
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0answers
27 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 ...
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2answers
54 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 ...
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0answers
21 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 ...
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1answer
73 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
76 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
172 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 ...
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0answers
29 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
53 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
63 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 ...
1
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1answer
39 views

How to connect to P2P clients behind a router?

Apologies if this question has been asked before, but I don't think any of the ones I've found are asking quite the same thing. I'm designing a simple P2P protocol whereby a known server provides ...
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0answers
26 views

SNMP through NAT when server has two IP addresses

We have an SNMP client talking to an SNMP agent through NAT. That works most of the time. We send an SNMP request e.g. from 1.2.3.4:12345 to 10.0.0.1:161 and get a reply from 10.0.0.1:161 to ...
1
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1answer
28 views

Route new outbound traffic

I am looking for some iptables rules which can help me to route some traffic from a server : Client 1 ----| Client 2 ----| |----------| Client N ----| ssh, ...
1
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1answer
192 views

Using host's iptables to prevent access to docker-container's exposed ports

I have a host which runs a few docker's containers. This host has a few network interfaces, my goal is make some exposed ports from containers accessible only by certain interfaces, and prevent ...
0
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1answer
34 views

ip6tables snat don't work properly [closed]

I got three computers with these names: laptop, vds and home; vds is openvpn server; home is openvpn client. and, I got an ipv6 network 2a01:dead:beef::/64 vds has address 2a01:dead:beef::311 on ...
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1answer
24 views

Howto forward traffic between multiple OpenVPNs

I have an OpenVPN server which hosts two VPN networks, one is bridged and the other one is routed. See the following draft: The VPNs are working quite well while they are used in isolation. But if ...
0
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1answer
712 views

MikroTik - can't access webfig from external / can't SSH into router from external ip

Ok, here's the deal. Let's say that my public facing IP is 10.0.01. I can't webfig into 10.0.01 from external and can't SSH into mikrotik router from external IP. I can do it if I am physically ...
0
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0answers
67 views

iptables DNAT packets into an openswan IPSEC tunnel

I have the following network setup: +-----------------------------------+ | | ...
1
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1answer
48 views

Apache can't access from wan on archlinux

Information: Archlinux via vmware Have ports 8080, 443 and 80 forwarded to the local ip from router running pfsense I can access the webpage from lan via local ip. My httpd.conf: Listen 80 ...