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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Vyatta Nat Rule Help Translating From Cisco ASA Rule

I'm fairly new to Vyatta and need advice on how to translate the following rule example from a Cisco ASA to the Vyatta. static (dmz2,outside) 192.168.254.0 192.168.254.0 netmask/24 How do I ...
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134 views

RTPProxy traversal does not work wit Opensips

I installed opensips but there is no sound on clients. This is what I did: apt-get install opensips rtpproxy osipsconfig I selectred Nat Tracversal and generated the .cfg file. The customized ....
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57 views

Cisco IP Redirection (static NAT?) for non existant IP Range

We are moving office and our managed service provider has let us down badly. We have a Cisco 4500 stack with 5 VLANS configured of interest. These are: interface Vlan200 description FLOOR0 Gateway ...
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108 views

Error: Can't create new inside entry - forced_punt_flags: 0

I have a router Cisco 3725 and setup NAT on this but when I run command debug ip nat detailed it show error "Can't create new inside entry - forced_punt_flags: 0" My router config as follow: Current ...
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1answer
310 views

pfSense can't access https website

I have just installed pfSense on a PC Engines APU1D4 to evaluate as an alternative to a Soekris 5501 + OpenBSD based setup, I have a PPPoE WAN configuration. The pf rules, NAT and PPPoE ...
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How to communicate effectively over a jumphost?

My company uses a jumphost to get into a datacenter. For various reasons I want to use applications that communicate from my localhost, to ports on a machine or set of machines in that datacenter. ...
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1answer
359 views

How to make VMs get LAN IPs from ESXi 6 Host

I have a very simple setup where my ESXi host is hooked up to the LAN just as other regular PCs. I have created a few VMs on that host and want to be able to access the LAN as if these were hooked up ...
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33 views

Expert iptables Nat - Virtual interface ip address issue

I've been looking information related to this problem several days, I had no luck finding a concrete explanation. Explanation about this issue: With this command I redirect one ip to another ip in ...
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4answers
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pfSense not forwarding back packets

I have a pfSense box setup where my WAN interface (em0) is set up in my local network (192.168.1.100) and my LAN interface (em1) is a private network of its own (10.0.0.1). The end goal is to have the ...
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tcp previous segment not captured when NAT

I have a client request web service on a server behide NAT. My client IP is 10.54.10.193 NAT address: 10.54.28.183 Server address: 62.209.39.203 When client request web service on server we have TCP ...
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60 views

ASA 9.1 NAT Rule issues

I added this NAT rule on my 5510 ASA object network SHF-NY-DC01 host 192.168.1.50 nat (Inside,Outside) static interface service tcp ldap 6699 access-list inbound extended permit tcp any object SHF-...
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How does NAT work with more than 2^16 devices? [duplicate]

According to this article, NAT keeps track of which devices to route responses to by specifying a response port that it listens on. For example, when I make a request from a NATted computer, my router ...
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1answer
62 views

forwarding from internal to external network does not work

I have a Ubuntu 14.04 LTS server with two NICs. One is connected to the internal network (eth0, 192.168.4.0/24) and the other one is connected to a router with internet access (eth1, network 192.168.2....
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2answers
392 views

Bind docker container ports only to specific outside server address

This is the first time i address such a network "problem" to solve with docker and i need some inputs. This is my situation: Ubuntu 14.04 running NginX, ufw as firewall and docker containers to ...
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1answer
24 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 ...
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2answers
926 views

Hyper-V host with one External IP address. How do I assign guest VMs an internal IP and configure NAT?

I've been struggling with this for a few days now, I've got a Hyper-V host with one statically configured external IP address. There is no DHCP server or internal network to retrieve an IP. How do I ...
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2answers
91 views

Trying to hookup 10-15 laptops to a switch, could someone point me in the right direction?

Let me start off by saying I am not a system administrator, however I am desktop client support. I have the need to have about 10-15 laptops to be hooked up to a switch that gives all 10-15 laptops ...
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1answer
158 views

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
165 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
57 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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61 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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115 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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228 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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278 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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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
131 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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114 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
74 views

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

I have the following NAT setup: +--------------+ +-----------------------+ +-------------------+ | | | | | | | | ...
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1answer
866 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
280 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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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
87 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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111 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
323 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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1answer
676 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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235 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
60 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
768 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
63 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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731 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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1answer
117 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
125 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
375 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
35 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
523 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
57 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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115 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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56 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 ...