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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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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iptables forwarding through virtual interfaces

I'm trying to configure my computer as a gateway between two networks, but I cannot make it working for some reasons Here is a representation of the network: 192.168.1.101 192.168.1.102 ...
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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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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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32 views

Setting up a virtual IP for high availablity [on hold]

Disclaimer; I'm completely new to server maintenance, availablity and clustering. I'm trying to achieve a high availablity server cluster configuration (failover, no load-balancing). I have two ...
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17 views

nat/portforwarding setup to access server on different network [on hold]

So in the office we have two networks, network A and network B. We have a server on network B due to limitations we cannot remotely access network B. Is it possible to set up port forwarding and nat ...
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Manual NAT on Checkpoint (Redirect all http requests to a local web server)

We have a proxy server in our internal network and I want to redirect all internet http requests to a web server in local network. It'll be like a Network Billboard that says "No direct connection is ...
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7 views

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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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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1answer
42 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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37 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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VMware workstation 11 [closed]

I want to connect my VM on VMware workstation in Bridged mode .I am launching an Ubuntu 14.04 LTS VM. But I can't connect to the internet in Bridged mode.VM has internet access in NAT mode but i want ...
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38 views

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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11 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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17 views

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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2answers
215 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 ...
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1answer
155 views

2 NIC vs NAT for exposing server

I'm trying to virtualize some applciation using Citrix. so I have to expose the Citrix Secure Gateway to Internet (put it in DMZ). my question is which is better practice ? using 2 physical NIC, ...
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Openswan tunnel to remote public NAT'd host

Need help on this VPN set-up to work. Left-hand. EC2: eth0:10.0.0.100/EIP=1.1.1.1 (ie. NAT'd IP) eth1:10.0.0.200/EIP=2.2.2.2 Peer ip/leftid: 1.1.1.1 Right-hand. Cisco: Peer ip: 3.3.3.3 ...
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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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58 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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iptables forward rule not working in openwrt

I am trying to apply some iptables forwarding rules in openwrt. Here is my scenario - My server has two cards ath0 and br-lan. br-lan is connected to internet and ath0 to private network. The other ...
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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 ...
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36 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 ...
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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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359 views

Load balancing Bind9 with Keepalived and LVS

How can I correctly configure LVS to masqerade/NAT packets from virtual ip to/from clients? Currently I have: UDP 10.47.1.80:domain rr -> 10.47.1.51:domain Masq 10 0 ...
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Unable to PPTP through NAT on Cisco 881

I'm trying to connect to a PPTP server which is sat behind a Cisco 881 NAT router. The server is running Ubuntu Server 12.04 and is running Poptop pptpd as the PPTP daemon listening for connections. ...
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12 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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1answer
28 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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64 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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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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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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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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sonicwall vpn and NAT

I have a site-to-site VPN set up with a vendor. Let's say the tunnel endpoints are 192.1.1.101 on my side and 192.1.2.0/24 on the vendor's side (which get's NATted to their LAN of 10.x.x.x). This is ...
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1answer
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asterisk/freeswitch in nat/no-nat setup

my current setup - i use bunch of sip hard-phones around few offices. all devices have two sip accounts configured - one on internal sip proxy [for calls between the branches], another - at 3rd party ...
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578 views

Large Scale NAT maximum concurrent connections issue

When I open Google Maps on a client PC that is behind a Large Scale NAT (LSN, Carrier grade NAT) the number of concurrent connections is limited to 15. Do you have any solutions how to enable more ...
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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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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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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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1answer
43 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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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 ...
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virtualbox: set up a private network for my VMs [migrated]

I have a few virtual machines I used to access with ssh. I set up their network configuration as Bridged and I set a static ip to them. But, as I'm moving from work to home to customer, the subnet ...
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1answer
3k views

cisco ip nat / port forwarding

I have been trying to get port forwarding working with a newly installed cisco router. I cannot seem to find where my fault is and have been looking for quite a while. The relevant section of my ...
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Forward traffic to local LAN IP while keeping the originator IP

I am trying to forward traffic from one server to another, while keeping the origin requestor IP. Therefor I cannot use SNAT or MASQUERADE. SERVER A: Public IP: 111.111.111.111 Private IP: 10.0.0.1 ...
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IPv6 and NAT, routing to multiple ISPs

Currently I have a nice setup using private IPv4 address space and uplinks from two ISPs to the Internet. Thanks to NAT I can just take down one of the interfaces and the Internet access is still ...
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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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1answer
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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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2answers
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Iptables: Forwarding packets doesn't work

I have 3 Linux Systems A, B and C. A is a TCP Client and sends a message to TCP Server on C. A can see only the external IP of B which is at wlan0 interface, 192.168.0.3 ------------------ ...
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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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40 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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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 ...