Questions tagged [nat]
For questions about Network Address Translation (NAT), a method of modifying network address information in IPv4 packet headers.
494
questions
0
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0answers
13 views
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.
0
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0answers
10 views
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 ...
4
votes
1answer
133 views
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)?...
1
vote
1answer
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 ...
0
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3answers
510 views
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 ...
1
vote
1answer
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....
2
votes
1answer
49 views
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 ...
0
votes
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 ...
1
vote
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 ...
1
vote
2answers
47 views
How to configure NAT between 2 private network ? CISCO routers
If anyone can help with configurations it will be helpful
0
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0answers
18 views
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 ...
3
votes
2answers
41 views
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 ...
2
votes
2answers
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 ...
8
votes
6answers
4k views
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 ...
1
vote
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 ...
2
votes
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 ...
0
votes
0answers
39 views
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 [...
3
votes
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....
0
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0answers
41 views
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 ...
0
votes
0answers
34 views
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 ...
4
votes
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?
1
vote
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 ...
2
votes
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 ...
2
votes
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 ...
0
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0answers
21 views
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 ...
0
votes
1answer
23 views
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 ...
1
vote
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 ...
0
votes
0answers
52 views
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. ...
2
votes
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/...
0
votes
0answers
19 views
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 ...
1
vote
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 ...
0
votes
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 ...
1
vote
2answers
72 views
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
...
2
votes
2answers
46 views
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 ...
-2
votes
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 ...
-1
votes
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 ...
2
votes
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
0answers
14 views
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 ...
0
votes
0answers
44 views
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 ...
1
vote
0answers
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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,...
4
votes
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 ...
2
votes
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 ...
2
votes
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
votes
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
votes
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 ...
