Questions tagged [dnat]

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DNAT From Virtual Network Gateway

I have a client connecting to my Azure Virtual Network Gateway (Gateway1) that sits in a Virtual Network (ClientVNet1: 10.13.0.0/16). I want the client to be able to connect to my DB (10.4.2.5) in a ...
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230 views

What is UDP Masquerading behavior when forwarding and listening on the same port to the same remote address?

Assuming the following: ||netns2|<-kernel routing-> netnsRoot| <-network routing-> |remote server| netns2 is a network namespace has a client that connects to the UDP server on UDP/5060 ...
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233 views

nftables natting with source IP

I have a server in a datacenter which is a Proxmox server. On the server (one of many, they are in a Proxmox cluster) I am hosting various VM's. Services on the VM's are exposed through iptables (...
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how can I NAT a NAT IP

I have a server on AWS with a floating (secondary) IP. During integrations with a partner I provide my secondary IP to be whitelisted and define a POSTROUTING rule to SNAT my IP to the secondary IP ...
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255 views

TPROXY interferes DNAT port forwarding rules

I'm setting up TPROXY on my VyOS router to forward certain traffic to a local transparent proxy. It works pretty well, until I discovered that all of my DNAT port forwarding rules are no longer ...
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Linux iptables DNAT IP range to single IP

I have following rules iptables -t nat -I PREROUTING -d 192.168.0.2 -p tcp --dport 20001:20100 -j DNAT --to-d 169.13.29.133:80 iptables -t nat -I PREROUTING -d 192.168.0.2 -p tcp --dport 20101:20200 -...
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Windows Server Destination NAT

I'm unsure of the terminology for this question. Trying to solve a problem, I'm being forced to grow and learn something very new to me! How would I do Destination NAT on Windows Server 2016/2019 for ...
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63 views

Is it possible to send traffic through the VPN tunnel to the VPN gateway itself?

I have a WAN interface X and a web server Y behind NAT, that is traffic to X:443 is being forwarded to Y:443. Web server is accessible from the internet without any problems. Then I have a site-to-...
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Redirect output to dynamic IP and change port

I have an application that needs to communication with two external hosts. For various reasons the host has now become a dynamic IP address. Since iptables communications via IP, simply using a ...
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2 answers
170 views

Forward traffic with iptables without exposing real IP/Port

I want to forward traffic with iptables without showing a different ip/port to sending host. My application listens on host x.x.15.42, port 23555 using TCP. The client will be connecting to x.x.15.42:...
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2 answers
3k views

Nftables - how not to dnat an ip on interface (DNS)

I have been searching, but cannot seem to find an answer to my specific issue. I have the following rule today under prerouting: iifname "br0" udp dport 53 counter dnat to 192.168.22.5:53 However, I ...
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962 views

fail2ban action to route to another ip

I want to create a fail2ban action which routes the traffic to another IP on ban action, and removes the route on unban action. File: iptables-route.conf in /etc/fail2ban/action.d/ # Fail2Ban ...
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1 answer
185 views

How can I limit data download with PREROUTING on iptables?

I have 2 servers, called A and B. All (tcp/udp) traffic will be redirected (via SNAT) from A to B (except SSH). The clients will be connected to A. However, the response will return from B. This is ...
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63 views

DNAT locally generated packets sent to local WAN address

I have an (OpenWRT-powered) router with a port forwarding (DNAT) rule that forwards incoming HTTP requests to a dedicated server box inside my LAN. Here's the relevant configuration bits. Addresses: ...
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Request Time Out / Sessions Stalling through IPTABLE (DNAT)

Scenario: Customer recently Migrated Clustered HANA DB Servers to Azure Cloud Platform but these are Physical Servers on Azure (Offering: Azure HLI). Usually these HLIs (HANA DB Servers) in Azure ...
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1 answer
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DNAT redirection works but returns with the redirect IP

I'm doing a test that my clients, network 10.101.29.0/24, when try to connect to 192.168.100.100 been redirected to 10.10.10.222. This part is working, but my problem is on the answer. The answers is ...
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1 vote
1 answer
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Strange behaviour on iptable with nat AND port forwarding

I have several dedicated servers hosted in several datacenters, and I want to migrate mail (pop3, imap, smtp and their TLS/SSL variants) services from one server to another. For that purpose, I ...
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1 vote
1 answer
2k views

DNAT using iptables only works for traffic incoming on eth0

I have a machine with two interfaces that have different routeable IPv4 addresses. To return traffic on the right interface, I used this answer and comment, and it works: I can ssh into the machine ...
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2 answers
568 views

DNAT without default route

I have a TCP service in a datacenter that is doing filtering and rate limiting based on source IP address. I'd like to move it to another datacenter. I'd like to provide the same service on an IP ...
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Redirect traffic from one IP adress to another

I am moving a server from one local IP address to another, and I have a lot of places on my network which statically reference the old IP address. I'd like to re-route that traffic to the new address, ...
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1 vote
1 answer
308 views

Need correct iptable rules for NAT instance to prevent loop back for private subnet EC2 instance outgoing traffic

My AWS architecture has a public subnet having a NAT instance. It forwards the traffic on certain ports to my EC2 instance hosted in a separate private subnet. sudo iptables -t nat -A PREROUTING -...
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Port 80 mixed up among clients using DNAT

I'm trying to set up a network like this: ...but I'm facing an issue. Here's the point: If I try to reach (e.g.) mywebsite1.com from external it works like a charm and it's shown my wonderful ...
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Can I access my VMware workstation intranet VMs through a public IP address

I have a Windows Server with a public IP address (102.1.1.1) and I've installed VMware workstation on it, creating several VMs on it. The VMs use intranet IP addresses, such as 10.0.0.1, 10.0.0.2. ...
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How-to DNAT-forward all IP traffic on Windows 10 from IP1 to IP2?

On my local machine, I want to setup a (web-)server that receives data that is sent (via http/https) to IP 65.55.44.109 (vortex.data.micorosoft.com). In order to do that, I need to forward all IP ...
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2 votes
1 answer
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KVM guest can't connect to itself after DNAT

Network Description Virtual hosting environment (KVM): Guest: Ubuntu 14.04.5 LTS \n \l Linux ari 3.8.0-29-generic #42~precise1-Ubuntu SMP Wed Aug 14 15:31:16 UTC 2013 i686 i686 i686 GNU/Linux Host:...
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Draytek Vigor2926ac Port Redirection across WANs

I have a DrayTek 2926ac router which has an Ethernet feed as it's primary WAN and a 4G router (factory default settings + APN) as the Failover WAN. When I disable the primary WAN, the failover WAN ...
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1 answer
1k views

(dnat|redirect) with masquerade doesn't work

I have a problem, till a bit ago it was working just fine. but now, it doesn't work, but on another testing server it works just fine I force all traffic to tor, and this part works just fine. ...
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-1 votes
2 answers
5k views

nftables dnat forwarding is not working properly [closed]

Good day, I am currently migrating from iptables to nftables. The problem is my systemd containers are running behind NAT, but I want to forward ports like 443 or 80 to them. There is no error message ...
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Infos about iptables DNAT/REDIRECT to local

I'm using Qubes OS, a system based on the Xen microkernel, which let you run easily multiple Virtual Machines and compartmentalize your digital life. All the domains are connected by default (through ...
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1 vote
1 answer
1k views

IPTables -j DNAT doesn't appear to work in a certain case

I am trying to change the destination IP address for an ICMP reply packet. The ICMP reply enters the router from my IPSEC tunnel as such (I'm not entirely certain why it is shown in tcpdump twice): ...
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4 votes
1 answer
3k views

Mikrotik - redirecting YouTube to a local friendly page

I'm configuring a rb750. I would like to drop YouTube access and redirect to a friendly page located in our local webserver. I can drop using l7 firewall but I'm not able to redirect user because ...
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1 vote
2 answers
355 views

IPTables DNAT WAN interface to hosted VM fails but DNAT to WAN IP succeeds

Thank you all in advanced! So here is the situation: 1. domain0 has two NICs (LAN=enp1s0f0, WAN=enp1s0f1) 2. vm0 of domain0 has IP=10.4.4.10 3. ip_forward=1 AND all interfaces forwarding=1 4. ...
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0 votes
2 answers
2k views

How to DNAT Broadcast Packets

I am working on a project where I have to DNAT some broadcast packets to a remote machine IP Address. So far I have learnt that IP-tables can only DNAT unicast packets and it does not DNAT broadcast ...
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119 views

Redirection (ip nat static) with filtering

I want to apply a D-NAT on my Cisco router to access my management IPBX server via the Internet and I have successfully done it with this command: (config)# ip nat inside source static tcp 10.1.1....
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3 votes
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Getting NATed traffic returned back to the right interface

On a custom board (running a 4.x kernel), I have two physical ethernet interfaces and one radio modem that gives me a ppp-interface. iproute2 has been installed, and I am using nftables (not iptables)....
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Port forward port 25 on a Firehol instance

I am trying to port forward through a Firehol box to my email server on port 25: clienta:25 > firehol > email:25 This is a non-transparent connection. The command I am trying is: nat4 to-...
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multiple ip dnat with firewall

i am having a vmware install running multiple VMs i would like 1 of them as a router/firewall where all external IPs are connected to and running different services on the other VMs like apache ftp ...
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3 votes
0 answers
971 views

IPTables DNAT Exemption

TL;DR - I'm looking for a way to send all my external traffic through a proxy server but not send all my internal traffic through a proxy server. How can I achieve this? My end goal is to forward ...
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1 vote
1 answer
383 views

DNAT for connecting a subnet via proxy to the internet

DNAT for connecting a subnet via proxy to the internet I want to connect a server in a subnet to the internet via a proxy-server. But I can’t ping a host on the internet (www). Actually the subnet-...
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Prerouting with iptables, destination port to DHCP ip

I have an iptables rule that translates requests to the same IP from different internal hosts by changing the source port. iptables -t NAT -A POSTROUTING -p TCP -d 173.32.1.2 --dport 873 \ -m state --...
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policy routing to guests on other server

After long searching I've found the answer to my challenge, but the last step fails. I have two identical servers that both serve multiple guests. The servers have two interfaces: one for the ...
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1 vote
1 answer
1k views

Forwarding ports from one bridged interface to a guest container on host OS

I have a simple configuration. Mind map how everything look like So I have a structure: Proxmox Host OS (vmbr0, vmbr1) Container 1 (eth0) Container 2 (eth0) The Proxmox networks: vmbr0 Link ...
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2 answers
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port rerouting with iptables not working

I want to reroute all traffic from a port e.g. 4445 (from localhost) to another port on another machine in the LAN e.g. 3305. I expected this should do the deal: iptables -A PREROUTING -t nat -i eth0 ...
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4 votes
0 answers
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iptables/nat/prerouting ignores UDP packets?

The same effect on many servers with various kernel versions. There are multiple Iptables DNAT rules: iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 12345 -j DNAT --to-destination 10.20.30....
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1 vote
1 answer
695 views

Iptables DNAT single port

I'm trying to redirect a single port to a local server via IPtables. Currently I have the following rules: iptables -t nat -A PREROUTING -p tcp -m tcp --dport 55555 -j DNAT --to-destination 10.188....
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3 votes
2 answers
5k views

Squid 3.5: Preventing forwarding loop in intercept mode

I have set up a router and an intercepting HTTP squid proxy on different machines. Clients should use the proxy (without knowledge) in the following way: Client -> Router (DNATing to proxy server) -> ...
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  • 412
1 vote
2 answers
883 views

iptables DNAT broadcast address

I'm having trouble using iptables to change the destination address of a broadcast packet. I have read several places that iptables/Linux won't forward broadcast packets, so I'm looking for ...
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3 votes
1 answer
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iptables nat table is not changing destination IP in PREROUTING?

OK, so on a vanilla Ubuntu 14.04.2 install, i run the following commands: sudo bash -c 'echo 1 > "/proc/sys/net/ipv4/ip_forward"' sudo iptables -t nat -A PREROUTING -d 192.168.100.1 -j DNAT --to-...
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1 vote
2 answers
548 views

UDP packet comes to VPN interface and is not delivered to the process

I have a server X (45.55.245.182) which is connected to server Y by VPN. VPN interface on X is tap0 with ip 10.200.0.2; VPN interface on Y is tap0 with ip 10.200.0.1. I run netcat on server Y to ...
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  • 195
0 votes
1 answer
706 views

iptables DNAT to external IP without masquerading does not work

On server 1.1.1.1: iptables -t nat -A PREROUTING -p tcp --dport 20000 -j DNAT --to-destination: 2.2.2.2:20000 iptables -t nat -A PREROUTING -p tcp --dport 20000 -j LOG --log-prefix pre20k iptables -...
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