Questions tagged [nat]

For questions about Network Address Translation (NAT), a method of modifying network address information in IPv4 packet headers.

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Running UDP port 43210 [on hold]

I want to host Bombsquad game windows server. UDP port 43210 is not accesed. I did Settings in Router but still this does not work. I use supernet Infocomm Router.
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Bridging two NICs [on hold]

(I know next to nothing about networking, so bear with me.) I have a Linux board with two NICs. One will only be connected to another board, the other will connect to a network. I need to make the ...
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1answer
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What does NAT64 do which can't be done by deploying IPv6 + NAT444?

Why was NAT64 developed? What does it do that can't be done by deploying IPv6 + NAT444, and allocating your customers a (public) IPv6 and a (private) IPv4 address (behind a shared public IPv4 address)?...
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26 views

Origin of Cone in NAT naming convention

I am reading about Full Cone, Restricted Cone and Port Restricted Cone NATs. While how they work is clear, I am having trouble coming up with a justification for such naming. The "Cone" probably has ...
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Why isn't 10.0.0.0/8 used instead of 192.168.0.0/16 for private addresses?

RFC 1918 “Address Allocation for Private Internets” (https://tools.ietf.org/html/rfc1918) specifies 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 as private addresses suitable for unrestricted private ...
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24 views

Difference Between PAT with pool or Interface/Loopback?

I'm just wondering what difference does it make when doing PAT with same IP defined in pool or assigning IP on Loopback and overloading that interface. ip nat pool MYPOOL 1.1.1.1 1.1.1.1 netmask 255....
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1answer
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Is this possible (NAT??)

I have a device on another network, say it's IP is 10.1.1.1 I want to ping it from my own network, say host 192.168.1.1, but I want to ping an address in my local segment to do so,so 192.168.1.2. Is ...
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1answer
15 views

How to use IXIA IxNetwork 8.40 to send bi-directional traffic between CPE and router

My setup is: IXIA -- CPE -- router -- IXIA I have one end of the IXIA connected to CPE, and getting private IP (DHCP from CPE). Other end is connected to router side and has public IP. Traffic ...
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2answers
33 views

How to configure snat between 2 private networks having different nat pools?

Hi, i'm having some problems with the current configuration i have on this network. I have two nat pools one for the blue square routers, and another for the yellow ones. And i'm using snat to have a ...
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2answers
47 views

How to configure NAT between 2 private network ? CISCO routers

If anyone can help with configurations it will be helpful
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Are there NATs which will block any further incoming packets from a peer after rejecting first one?

I'm attempting to test udp hole punching. Right now I'm simply testing how my computer reacts behind a router. If I send a udp packet from my computer to a server, it can reply back on the same port ...
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Overload PAT Question

Learning details of NAT PAT. I understand basics wherein the PAT router incorporates a source port to ID the private address computer communicating out on the public address, enabling the public ...
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108 views

NAT VLANS with same IP subnets and same IP addresses

I want to do something very similar to NAT VLans with same IP sub-nets but it is dissimilar enough that I don't know how to apply it to my application. I did find NAT Overlapping but it places ...
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Could IPv6 make NAT / port numbers redundant?

From what I can tell, each process could get its own IP address, with loads of IP's to spare. What would the drawbacks be? Essentially, your host would become a router and each process is a host (in ...
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1answer
40 views

Juniper port forward range of ports with dynamic pppoe

I have Juniper SRX300. Due to some restrictions, i can't use static WAN IP address. I need to port forward a range of ports and it's working only using nat static section like this: username# show ...
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2answers
62 views

NAT + load sharing

I would like to do NAT while load sharing is active on R1 and R2 (cisco routers). Do you have any ideas how should I do it effectively? Is there some way to share a common NAT table between the 2 ...
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How to route a specific users IP from WAN to a specific host IP on a subnet OPT1 (pfsense)

I host a game server, Players and Devs use the same launcher/client that has hard coded ports (5555) that cannot be changed. (No Configuration Files) How would I route Devs to the Development Server [...
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1answer
59 views

How to send a packet across NAT to local machine

I recently read about network address port translation and I have a doubt. Lets say I have a PC(PC1) at 192.168.1.2 under a router with public address 10.74.65.11 . I have another PC(PC2) at 192.168.1....
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NAT setup for two LANs on same router

We have a moxa edr 810 series router , we have few devices connected to the router as below. We are using IPsec tunnel for VPN. From VPN we are able to connect Device 2 , but not able to connect to ...
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Bi directional natting between two lans

I have two lans , say lan1 and lan2 on my router. My problem is that i tried give a lan1 ip to a lan2 device by using bi directional natting , but what i see is that this lan1 ip always resolve to the ...
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2answers
2k views

IP addresses from public IP block in my LAN

If I have NAT or PAT applied on edge router, Would it matter if I use IP addresses from public block in my LAN? And how?
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1answer
27 views

NAT Problem Fortigate 501e v6.0

I created a VIP and am having trouble connecting this VIP to an IPv4 Policy. When I put it into the destination I get an error: "Failed to save some changes: Entry not found." I am trying to create a ...
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2answers
50 views

ACL: Deny specific host not working

I'm trying to create an acl for use with a nat but I can't get the deny statements working. All hosts on a private network should be accessible, except from a server which should not be accessible ...
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2answers
42 views

Does NAT always translate the destination address of a packet?

From https://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/13770-1.html This document provides a sample configuration with the ip nat outside source list command, and ...
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How does this NAT translate the same public address to different private addresses, without using ports? [duplicate]

From http://www.firewall.cx/networking-topics/network-address-translation-nat/228-nat-table.html translates the same public destination address 203.31.220.134 to different private destination ...
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1answer
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Without NAT or NAP, can a host in the Internet send a response back to a host in a private network? [duplicate]

Suppose a router device connect a private network and the Internet, and doesn't have NAT or NAPT features. If some application on a host inside the private network sends some packets to a host in ...
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3answers
44 views

Is a gateway both a router and a NAT?

From Tanenbaum's Computer Networks: The general name for a machine that makes a connection between two or more networks and provides the necessary translation, both in terms of hardware and ...
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Simultaneous dynamic and static NAT not working

Cisco 4200 series running IOS XE with a single public IP address and dynamic NAT, which works just fine. I am trying to add Static NAT to access a server (map external port XX to internal port YY. ...
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1answer
45 views

Juniper SRX Destination NAT for L2TP server

I have a L2TP server on my LAN which I would like to access from WAN and there is a Juniper SRX standing between these two networks. I've had some success with this post: https://forums.juniper.net/t5/...
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NAT->Multicast Setup->ACL? [duplicate]

I am a network newbie and would be amazing for some help. I trying to input multicast (239.10.1.11) onto a router 0/0 interface and would like to output multicast on (239.0.0.2) on interface 0/1. The ...
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2answers
45 views

Can a host in a public network communicate with a host in a private network, by layer 3 alone?

Suppose a private network and a public network are connected by a router or some other device. After a host in the private network sends a message (e.g. a HTTP request) to a host in the public ...
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1answer
37 views

What are the differences between packet forwarding and network address translation in layer 3?

What are the differences between packet forwarding and network address translation in layer 3? Is packet forwarding done by a router between two networks that use public IP addresses? Is network ...
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Unable to access Server over VPN behind 2 Fortigate Firewalls; however ping is working

Client -> VPN -> FG1 -> FG2 -> Server Created a VPN tunnel with remote IP 10.20.30.4/32 and local ip 10.20.30.40/32 on FG1, NAT/VIP is established with VIP as 10.20.30.40 and server IP as 192.168.2.6 ...
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2answers
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Are both VPN and NAT alternative ways to provide access to a private network?

https://en.wikipedia.org/wiki/Virtual_private_network A virtual private network (VPN) extends a private network across a public network, and enables users to send and receive data across shared or ...
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1answer
54 views

How do i find out if a LAN is behind a multi-level NAT? [closed]

Not much i can specify here - its obvious that my CPE is NATing my LAN, but how do i find out if my ISP is using a carrier-grade NAT (obviously, without asking them)? I heard that port forwarding is ...
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1answer
40 views

MAc address or IP address? which one gets used from my pc to router? [duplicate]

Question 1) which one is used nowadays? NAT or PAT? Question 2) as I knew, when my pc requests some website, what happens is , the data(packets) from my pc go to router. then router makes the request ...
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1answer
34 views

How do I find out which NAT is getting hit?

I can see in packet captures that my packet's destination IP is getting translated. How do I find which NAT statement is responsible for the conversion if my device has over 200 NAT rules? I'm using ...
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1answer
37 views

How does packet traversal works over a public network with NAT overloading

Let's say I have a private network connected to the internet with default gateway 192.168.1.1 on Router1. Now a host(Host#1, 192.168.1.10) on this network wants to send a packet over the public ...
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2answers
63 views

How can AWS restrict access by private IP?

The official AWS docs state: If you are connecting through an ISP or from behind your firewall without a static IP address, you need to find out the range of IP addresses used by client ...
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0answers
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How to connect private networks? [duplicate]

I need to connect two private networks. I have the same IPv4 addresses and need to establish connection between them. • How can I connect them? (NAT?) • What type of routing to use? (I know static ...
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Cisco L2TP Tunnel and NAT

I have problems with NAT clients connected to an AP . This AP has an L2TP tunnel established to a Cisco router (7206VXR). The session is UP and the router can ping the IP of the client. The client ...
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54 views

Why NAT type detected by `stun` command depends on used STUN server? [closed]

# stun -v stun.counterpath.net |& grep '^MappedAddress\|Primary' MappedAddress = 93.84.76.218:20458 MappedAddress = 93.84.76.218:20458 Primary: Independent Mapping, Port Dependent Filter, preserves ...
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1answer
79 views

Accessing internal website from subnet

I have the following network: - Edge Lite 3 router with public IP on WAN (eth0) and 2 LANs: 1) eth1 192.168.1.11/24 2) eth2 192.168.2.11/24 eth1 is DHCP, I have several work laptops inside. eth2 ...
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1answer
36 views

A question on NAT [closed]

I know ISP's use NAT to provide a home user with a public IP. If multiple devices connect to the internet using the same router all will have different private IP addresses but similar public IP ...
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1answer
25 views

Daisy chaining IOT devices without switches? [closed]

I have multiple IoT board with two network interface in each device. I want to connect them in a daisy chain without help of switch. The eth1 of first device will be connected to eth0 of second device,...
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1answer
332 views

Will the data transfer with the destination on the same LAN network be routed through the internet when the WAN IP is used?

I'm planning to set up a Nextcloud locally. I will be using my own domain with a DNS record to connect to my WAN IP and port forward the needed ports to the local machine running Nextcloud. Now of ...
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2answers
408 views

NAT Translation Table Port Number

I had a practice question about a NAT-enabled router with outside address 24.34.112.235 and inside network 192.168.1/24 and three inside hosts .1, .2 and .3. The three hosts all open two connections ...
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4answers
137 views

Can I make 2 ISP providers' IP addresses into 1 IP address?

We have 2 ISP providers (X, Y) and we have connected the ISPs to a core switch>Sophos firewall>Switch rack>end user (LAN & WiFi). This ISP works on fail-over mechanism. The issue here is that we ...
4
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1answer
153 views

PAT not translating at all

I am studying for my CCENT. I threw together a PAT practice lab. Other than DHCP and RIP everything is pretty stock. No VLANs No security Just NAT overload on ACCESS router. I am stumped why it isn'...
4
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1answer
136 views

Source NAT on Juniper SRX300

I'm having issues setting up the Source NAT on my SRX300 firewall. The firewall is connected to an LC-panel through a fibre optic cable in port 0/6. I have set the public ip on that interface and have ...