Questions tagged [dnat]

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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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154 views

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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46 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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38 views

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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2answers
86 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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2answers
1k 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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2answers
458 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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1answer
110 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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1answer
46 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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32 views

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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1answer
38 views

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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1answer
212 views

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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1answer
1k 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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2answers
347 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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100 views

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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1answer
175 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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1answer
51 views

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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1answer
296 views

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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2k views

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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1answer
160 views

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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343 views

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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1answer
814 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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2answers
4k 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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78 views

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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1answer
877 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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1answer
2k 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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2answers
279 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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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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1answer
103 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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385 views

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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485 views

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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1answer
60 views

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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0answers
734 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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1answer
244 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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896 views

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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1answer
65 views

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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1answer
894 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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2answers
230 views

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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0answers
817 views

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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1answer
414 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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2answers
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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2answers
787 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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1answer
792 views

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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2answers
425 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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1answer
565 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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1answer
447 views

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

I have the following NAT setup: +--------------+ +-----------------------+ +-------------------+ | | | | | | | | ...
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1answer
2k 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
133 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
71 views

NAT forwarding (whole IP) working only on some ports

Since my hoster doesn't allow briged setups I had to go for a NAT solution to run my CentOS VM on an additional IP and my host machine on the primary IP. Now, I've got a problem since for ports 22, ...