iptables nat port forwarding rule set
location: linuxquestions.com - date: October 16, 2006
I have been trying to do a port forward, but I am new to iptables.
I have two ethernet ports: eth0 WAN, and eth1 LAN
I want anything which hits eth0 dport 2222 to be forwarded out eth1 to 192.168.1.5:8000
Do I need to do a FORWARD, PREROUTE and POSTROUTE rule? Or can I just do a PREROUTE
I tried this with no luck:
sudo iptables -A FORWARD -i eth0 -p tcp --dport 2222 -j ACCEPT
sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 2222 -j DNAT --to-destination 192.168.1.5:8000
Do I need the:
sudo iptables -A FORWARD -i eth0 -p tcp --dport 2222 -j ACCEPT
or will PREROUTE work without it?
Do I need to FORWARD if I already have a routing table set up?
iptables + NAT + Port forwarding problem
location: linuxquestions.com - date: May 11, 2004
Hi, I am having some trouble forwarding ports one my Gentoo router. Everything is working great except for the port forwarding. I figure it is probably a stupid mistake, but time is a factor here and I have not been able to come up with my own solution thus far. Any help would be greatly appreciated.
The goal: Forward external ports (eth0 12.215.xxx.xxx) to internal IP addresses (eth1 192.168.1.0/24). I am mainly concerned with port 80.
My current script:
[SOLVED] ubuntu router/port forwarding
location: linuxquestions.com - date: July 15, 2014
Hi, I'm very new to linux but have been trying some advanced configurations. Sorry if this is a long post but I've tried a lot of things already and I want to give proper context.
I've set up a ubuntu 12.04 server as a router with port forwarding (issue is with smtp). I've poured over all the information I could Google on it and I'm 90% there, just have a few weird issues. My guess is I don't have UFW configured correctly either on the router or on the mail server.
I'm running an ubuntu 12.04.4 LTS VM on Hyper-V (I know, Virtualbox or VMware are far better but it is what it is). eth0 is configured with a public IP, eth1 is a private LAN address 10.0.0.1 in my DMZ. I also have another ubuntu server as an internal firewall separating my DMZ from my internal network, it has an interface configured with DMZ IP 10.0.0.254. My destination http/https servers are currently on my internal network, i haven't moved them to the DMZ yet so port forwarding passes through the internal fw. The s
KVM NAT port forwarding
location: ubuntuforums.com - date: January 17, 2015
I would like to publish guests services (http, ssh and etcetera) to the outside world through NAT. I followed many tutorials and I have following rules in iptables:
iptables -t nat -I PREROUTING -p tcp -d x.x.104.49 --dport 22 -j DNAT --to-destination 192.168.122.20:22
iptables -I FORWARD -m state -d x.x.104.49/27 --state NEW,RELATED,ESTABLISHED -j ACCEPT
iptables -t nat -I PREROUTING -p tcp --source -d 192.168.122.0/24 -j ACCEPT
I save it with this:
service iptables-persistent save
But still, I cannot access guest en services.
My network settings:
em1 Link encap:Ethernet HWaddr b8:ac:6f:8b:7d:49
inet addr:x.x.104.49 Bcast:x.x.104.63 Mask:255.255.255.224
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:45643 errors:0 dropped:0 overruns:0 frame:0
TX packets:38934 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:3631264 (3.6 MB) TX b
ubuntu server port forwarding to private ip
location: linuxquestions.com - date: March 1, 2014
I realize this maybe simple for some but my research for a solution is getting me nowhere on this.
I am basically trying to do something so simple thats becoming a difficult task for me ... and yes i was a redhat certified technician a while back but i just never studied iptables and its drama.
What i am trying to do is something silly. use my vps as a gateway and have it forward traffic on incoming ports to my private computer at home.
so traffic that would come in on port 9003 (for example) to my VPS ip would be forwarded to my home ip via what i have setup which is the openvpn server.
on the openvpn server i've given myself a static ip of 172.27.230.2
I want my vps public ip to be "mask" so to speak.
So then traffic that comes to my pubip:9003 gets redirected to 172.27.230.2
in ubuntu server i tried to use ufw (ubuntus firewall software) to first open the port then i tried a nat redirect rule.
i then used a tcp/ip program on my windows machine cal
Ubuntu Server 11.04 NAT problems port forwarding
location: ubuntuforums.com - date: November 17, 2011
Ubuntu server 11.04 64bit with vmware workstation 8.0 installed with Win XP guest!
I'm trying to get RDP working to VM! I'm having problems with ports on Ubuntu. I used ufw to open port 3389 tcp for incoming connections allow anywhere and port 9997 allow from 192.168.157.0/24. I configured forwarding in vmware NAT.conf for 9997 tcp to VM address.
What is strange to me is that when I run netstat -lntup as root these ports are nowhere to be shown. When I run ufw status they are shown as opened. Scanning Ubuntu using Nmap only shows 3389 tcp closed ms-term-serv. Nmap should show at least few more ports as open!
I would appreciate if anybody would help me with this!
Port Forwarding trouble with iptables on ubuntu gateway
location: linuxquestions.com - date: November 14, 2008
I have a template for an rc.DHCP.firewall script that allows a person to setup a router that performs masquerading and, ideally, will forward ports 22, 80, etc to my local server.
EVERYTHING works (ie, there are no errors from iptables, and clients are able to view internet fine), but when i try www.elgrandomain.com, it says "Connection failed. Though the site seems valid, the browser was unable to establish a connection."
can anyone help me fix my script please?
here's my script.
Ubuntu Server UFW Port Forwarding
location: linuxquestions.com - date: October 19, 2011
I have built an Internet gateway using Ubuntu Server 11.10 x64_86.
* IP address: 192.168.1.1
* Only one interface - eth0 (There is a separate firewall device that translates this to public IP for internet access)
* UFW enabled
* Squid3 plus squidguard
What I want
1. forward all traffic from port 80 to port 3128 so that squid may block unauthorized sites.
What I did.
On my test PC, i put the 192.168.1.1 as the gateway so that I can access the Internet. On the browser, no PROXY settings. Results, successful connection and can access different sites.
However, squid3 seems not to be intercepting traffic, and therefore sites are not blocked
What I test
I used tcpdump port 3128. Result, no traffic.
I used tcpdump port 80. Result, successful logging of sites
accessed by my test PC
To test if squid/squidguard is working here is what I did.
On the test PC i set the proxy to 192.168.1.1:3128. Result, blocking successful and squid is working
What I want
SSH port forwarding [Ubuntu Host] to Mac Client
- date: April 14, 2010
I have open-ssh installed on my ubuntu computer, and I can SSH into it perfectly.
ssh [email protected]
To access official Ubuntu documentation, please visit:
3 packages can be updated.
0 updates are security updates.
You have new mail.
Last login: Wed Apr 14 12:37:30 2010 from [email protected]
However when I run
sudo ssh -Nv -L 80:127.0.0.1:80 [email protected]
debug1: Authentication succeeded (password).
debug1: Local connections to LOCALHOST:80 forwarded to remote address 127.0.0.1:80
debug1: Local forwarding listening on ::1 port 80.
debug1: channel 0: new [port listener]
debug1: Local forwarding listening on 127.0.0.1 port 80.
debug1: channel 1: new [port listener]
debug1: Requesting [email protected]
debug1: Entering interactive session.
debug1: Connection to port 80 forwarding to 127.0.0.1 port 80 requested.
debug1: channel 2: new [direct-tcpip]
ssh port forwarding doesn't work on Ubuntu 10.04 LTS
location: ubuntuforums.com - date: June 13, 2012
I have a problem of dynamic port forwarding on Ubuntu 10.04. I have a Ubuntu 10.04 desktop which connects to internet through a proxy. This machine (machine A) is installed with SSH server. From another machine which is also installed Ubuntu 10.04, I tried to use dynamic port forwarding with the command
ssh -D 9999 <user>@machineA
Then, at the SSH client, I configured firefox to use the SOCKs v5 127.0.0.1:9999 as a proxy but I couldn't access to the internet using dynamic port forwarding. I tried successfully with a CentOS server with SSH server enabled.
Most of documents and articles in the Internet say that it's simply to enable X11Forwarding, AllowTcpForwarding and PermitTunnel on SSH server. I'm not sure if this problem is related to firewall rules, Ubuntu 10.04, etc. Do anyone have an idea how to solve this problem?
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