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1answer
18 views

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

I have the following NAT setup: +--------------+ +-----------------------+ +-------------------+ | | | | | | | | ...
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0answers
15 views

IPTABLES Forward a Input with specif dport to VPN and masquerade

Inside our company we have a XMPP server that works with source 10.0.0.0/8. But, What I want to do is redirect a package coming from WAN to the VPN (which is where our XMPP is located) but doing a ...
0
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1answer
38 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
33 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 ...
0
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1answer
30 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, ...
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1answer
42 views

rewrite destination IP of TEEed traffic

Server 1 and Server 2 (Centos 7) both host the same application, which listens on UDP port 1514. Server 1 receives traffic on this port. The goal is for the application on Server 2 to receive a copy ...
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0answers
48 views

iptables foward to multiple interfaces with NAT

I want to use iptables for provide NAT translation and forward the packets out a different interface. The network set-up is as follows: Alias: eth0:220 with IP address 10.1.1.220 / 255.255.252.0 ...
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1answer
58 views

How do hosting providers give each container a unique public IP? [closed]

I'm looking in to starting my own hosting company; even if I'm only paid in experience. At first, I thought I'd create shell scripts to automate the creation of OpenVZ containers. But then I ...
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1answer
449 views

Using host's iptables to prevent access to docker-container's exposed ports

I have a host which runs a few docker's containers. This host has a few network interfaces, my goal is make some exposed ports from containers accessible only by certain interfaces, and prevent ...
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0answers
102 views

iptables DNAT packets into an openswan IPSEC tunnel

I have the following network setup: +-----------------------------------+ | | ...
1
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1answer
182 views

Why some iptables DNAT rules don't work until reboot?

My iptables DNAT rules don't work until reboot. If I reboot my server, all of the rules work. Desciption of the architecture : Tens of hosts (senders) send some UDP packets (one-way on a specific ...
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0answers
165 views

Destination NAT on different Internet IPs with Kerio Control

We are using Kerio Control as our cloud infrastructure firewall. I have two internet IPs (v4) assigned to Internet Interface. I need requests to one of these IP's to be DNATed to a webserver inside ...
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1answer
41 views

DNAT in Shorewall not working for VPN

I have a firewall (10.8.0.1) connected to an internal server (10.8.0.2) via VPN. On the firewall the VPN interface is called tun0. So in my shorewall configuration I have this: $ cat interfaces #ZONE ...
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1answer
130 views

Port redirection with iptables to localhost / blocking the destination port

I like to forward all traffic coming to 80 to be redirected to 8000. I used iptables -tnat -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8000 But then port 8000 is still open to ...
0
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1answer
57 views

iptables: DNAT configuration FTP service

Hi have a FTP server behind a firewall and have problemi with DNAT configuration, internal server have ip 192.168.4.110: iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT ...
0
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1answer
46 views

iptables dnat mapping to specific ip

I constructed a private net with two machine, both of them have two network interfaces this is the networking information: machine1: eth0 10.0.0.11 (private net) eth1 10.82.80.208 (Campus Network ...
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2answers
106 views

Port forward with iptables

I got lo (127.0.0.1) and eth0 (172.17.0.8). I want to redirect packets that land on 127.0.0.1:80 to 172.17.42.1:80 (route from eth0). I tried iptables -t nat -A OUTPUT -p tcp --dport 80 -d 127.0.0.1 ...
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1answer
145 views

Are iptables prerouting (DNAT) packet changes visible to subsequent chains?

I was reading Rusty Russell's NAT Howto when I came across this section: 6.2. Destination NAT This is done in the PREROUTING chain, just as the packet comes in; this means that anything else on ...
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2answers
96 views

use iptables's nat to proxy mysql

I find this similar thread but don't work: http://stackoverflow.com/questions/10864854/forwarding-mysql-connection-with-iptables-and-differents-network-interfaces?rq=1 My environment as follows: ...
2
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1answer
2k views

Proxmox Nat Networking Issue

Definition I have installed Proxmox 3.2 and i am trying to configure a virtual machine as a communication server that handles all traffic and forwards them to the nodes with private ip. I ...
1
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1answer
47 views

Linux iptables DNAT 53306 to 127.0.0.1 3306

mysql real port is 3306。 I want public network using 53306 to visit mysql,and 3306 not allowed access from public network. How to write the iptables rules DNAT 53306 to 127.0.0.1 3306 ? help me
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1answer
189 views

Redirect traffic from one server to something.cloudapp.net (CNAME) [closed]

Through out North America, we have lots of legacy devices, which sends data to our server which has static IP Address. Now we are moving to Azure cloud services, and as you know they do not guarantee ...
0
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1answer
127 views

iptables NAT forward range

I have two network interfaces, eth0 and eth1. eth0 has a public ip, eth1 has 172.16.0.254/24. I'd like to do the following mapping: 172.16.0.1:22 -> eth0's public ip:2001 172.16.0.2:22 -> ...
1
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1answer
726 views

Reply on the same interface as incoming with DNATed IP

A server has 3 ifaces, 2 internal (eth1/2) in different public networks, one external (eth0). There is a service (openvpn) that can't bind to some IPs/ifaces, only to all or one, but I need it to ...
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2answers
216 views

Forward web request to another computer

I have one notebook and two servers: ip = 172.17.0.2 (I have installed nginx here) ip = 172.17.0.3 (There is nothing here, but I can ping 172.17.0.2 from here) I open browser on my notebook, open ...
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0answers
92 views

Some packets are dropped in [wan-local], when DNAT rule exists

I am running EdgeOS (aka vyatta 6.3 aka debian) with 3.4.27. There are two DNAT port forwarding rules like this: rule 1 { destination { port 65432 } inbound-interface eth0 inside-address { ...
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1answer
531 views

netfilter DNAT rule doesn't work for local traffic

I have a webserver hidden behind a firewall. A DNAT rule on my firewall makes it reachable for visitors from the internet. The rule works for traffic from the internet. Unfortunately it doesn't work ...
0
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1answer
206 views

DNAT from localhost (127.0.0.1)

I'd like to set up a TCP DNAT from 127.0.0.1, port 4242 to 11.22.33.44, port 5353 on Linux 3.x (currently 3.2.52, but I can upgrade if needed). It looks like the simple DNAT rule setup doesn't work, ...
3
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1answer
5k views

port forwarding through AWS VPC NAT

Yes, I have already scoured the internet and read most of the popular IPTables / DNAT guides / pages / posts. My Problem Summary I have a VPC with several subnets. One subnet in particular requires ...
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1answer
74 views

Do any applications using port forwarding require the SNAT address = external DNAT address?

We use iptables to implement SNAT for our users with a dozen external IP's in round robin (for load balancing). Our developers require port forwarding to their machines and have each requestded a ...
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1answer
1k views

iptables with DNAT and multiple gateways: How to route replies to correct gateway?

I have a problem setting up iptables rules and routes on a Linux client for a scenario with DNAT and multiple gateways: We have two gateways to the Internet. The first has a fixed IP, the second ...
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2answers
323 views

iptables: filter before DNAT

iptables -t filter -A OUTPUT -d 1.2.3.4 -j DROP iptables -t nat -A OUTPUT -p tcp -m owner --uid-owner abc -j DNAT --to 127.0.0.1:121 First rule does not work because nat it processed before filter. ...
0
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2answers
357 views

NAT from Pvt ip to PublicIP

I have a gateway machine with 2 NIC: eth0 with public IP and eth1 with private IP. On eth0 I have 4 public IP aliased, I wanted to NAT public IP to private IP and I used DNAT to do that uisng ...
0
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1answer
41 views

DNATing multiple ips not working

i have centos box with public ip on eth0 and private ip on eth1,4 pub ips are aliased on eth0. I have written DNAT rule to NAT request on 1.1.1.3 to 10.10.10.3 it worked fine, but when i add more ...
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2answers
848 views

ASA 5505 outside access for clients with dynamically assigned IPs, no outside access for clients with static IPs

We have an ASA configured to access the internet, which works fine for clients who have an IP address assigned by DHCP, but not for clients with manually assigned IPs. For instance, with the DHCP ...
1
vote
1answer
49 views

DNAT generically?

How would you setup iptables to generically send packets of some port say tcp port 80 to the correct machines (which are not all in the same subnet)? For ex: iptables -t nat -A PREROUTING -s ...
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0answers
98 views

NAT Public ip to that many number of pvt ip

i have a Linux box with two interfaces one with ip 10.10.18.2 and other with ip 192.168.1.2,192.168.1.3 aliased. A xen host is connected with ip 10.10.18.3 and gateway 10.10.18.2 to this through a ...
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2answers
415 views

NAT with iptables: need help understanding

i am trying to learn NAT with iptables but i ran into some confusions. i am having two virtual machines with ips 18.43 lets say B and 18.42 C running webservers on port 80. i need to NAT every ...
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0answers
129 views

iptable DNAT poor performance

I have the following rule for PORT FORWARDING: root@foo:~# iptables -t nat -S -P PREROUTING ACCEPT -P INPUT ACCEPT -P OUTPUT ACCEPT -P POSTROUTING ACCEPT -A PREROUTING -p udp -m udp --dport 1:1024 ...
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0answers
310 views

ejabberd on vm not connect to another xmmp server (iptables dnat dport 5269)

i migrate a ejabberd server to a vm with only private ip. is work fine but not connect to anothers xmmp servers. log: s2s connection: xxxx -> gmail.com (remote server not found) telnet test: telnet ...
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0answers
755 views

openstack, bridging, netfilter and dnat

In a recent upgrade (from Openstack Diablo on Ubuntu Lucid to Openstack Essex on Ubuntu Precise), we found that DNS packets were frequently (almost always) dropped on the bridge interface (br100). ...
1
vote
1answer
1k views

How to DNAT to different local IP based on what public IP was accessed with Shorewall?

My server has several public IPs, and is running a bunch of virtual machines with private IP adresses. As an example, I want to map ports 80, 443 and 8080 on 232.21.23.23 (public) to 192.168.122.12 ...