Networking :: Iptables Port 161 UDP/TCP?

Mar 18, 2011

iptables -A INPUT -p udp --dport -j ACCEPT
iptables -A INPUT -p tcp --dport -j ACCEPT
iptables -A FORWARD -p udp --dport -j ACCEPT
iptables -A FORWARD -p tcp --dport -j ACCEPT

and the rules are placed in iptables, i can see them when I do iptables -L. But when I do netstat -an | grep 161 I can see that port 161 (SNMP) is not listening. Why?

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Networking :: Use Iptables In Order To Forward All The Incoming Packets For Port 5555 To Port 5556?

Apr 4, 2011

I'm trying to use iptables in order to forward all the incoming packets for port 5555 to port 5556 on the same server (192.168.2.101).

I wrote the following commands:

iptables -A PREROUTING -t nat -i any -p tcp --dport 5555 -j DNAT --to 192.168.2.101:5556
iptables -A FORWARD -p tcp -m state --state NEW -d 192.168.2.101 --dport 5556 -j ACCEPT

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Networking :: Iptables Can't Port Forward (PAT Port Address Translation)?

Feb 20, 2010

I'm using a Debian servers, as router/firwall.. I've two ethernet interfaces into the server, one for wan and one for lan. The i use SNAT so my LAN clients can access the internet throgh the debian router. That is working... Now i want to be able to access servers on the LAN site from the WAN site, and i wanna use port address translation (PAT). I have a FTP server running on a lan server, so i'm trying to portward port 21.

iptables -t nat -A PREROUTING -p tcp -i eth1 -d (WANIP) --dport 21 -j DNAT --to 192.168.1.2:21

When people try to access my FTP from the WAN site, they are redirected to the local FTP server, and they are promted for crendentials, but when the credentials are typed, and the local ftp server should answer the wan request, the connections dies.

The wan clients are being promted for credentials, so they are redirected to the local lan server, but after that the connections dies, so i think there is some kind of nat problem, when the local lan server is trying to respond to the wan request..

Here i my iptables script:

#flush table
iptables -F
#input regler

[code]....

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Networking :: Iptables - Port Forwarding To Blocked Port?

Mar 25, 2010

I have a mail server on which I would like to block port 25 on my eth0 for everyone except our external spam filter. the problem is that I want our users to be able to connect via port 10025 which is forwarded to port 25, which then is blocked...

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Networking :: Iptables To Hide A Port?

Jan 13, 2010

I am running a voip server on port 5060. I want to hide this to all the robots scanning the net permanently - I know this is not enough security - it is just to prevent them from wasting by bandwidth testing all usernames until fail2ban stops them !

I'd like to have port 5060 accepting requests only from 'trusted' hosts, while others (client with dynamic ip) use port 5065 - thus, port 5060 will only appear open for some trusted partners and the bots will skip to something else.

I have setup the iptables rules succesfully to accept only trusted hosts.

-A RH-Firewall-1-INPUT -s 93.x.y.z -p udp -m state --state NEW -m udp --dport 5060 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m state --state NEW -m udp --dport 5060 -j DROP

I've added a PREROUTING NAT rule that change the port from 5065 to 5060 for others - but then, this gets caught in the INPUT rule as port 5060 -A PREROUTING -p udp -m udp --dport 5065 -j DNAT --to-destination 192.168.1.1:5060

This works so well that the packets coming on port 5065 are translated to port 5060 and get caught in the DROP rule...

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Networking :: Iptables Not Port Forwarding?

Aug 14, 2010

I have a CentOS box which is Internet Facing. It has 3 LAN's connected to it which are for virtual machines.

I want to port forward port 445 to a machine on one of the LAN interfaces. I have tried various ways to get it done, but still cannot access that port from the interface. I definately know device hosting port 445 is live, as I can ping it from the CentOS box and use lynx to access it! (It's a web server)

iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 445 -j DNAT --to-destination 192.168.0.2:445

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Networking :: Iptables Port Forwarding?

Jun 7, 2010

I've been Googling about port forwarding iptables and even though there's result and I've applied it in my script, I can't make iptables forwading request to another machine so I decided to ask help.

eth0 is my Internet Interface (1.2.3.4 is the public ip)
eth1 is my Lan Interface
eth2 is my DMZ Interface

[code]....

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Networking :: Use Port Redirection Using Iptables?

Jun 17, 2010

There is this server where in I want to use port redirection using iptables. For port redirection I have used nat table with PREROUTING chain and REDIRECT option. Like:

Code:
iptables -t nat -A PREROUTING -p tcp --dport pop3 -j REDIRECT --to-port 8110
It just does not work. I have tried to redirect other ports as well but nothing works.

[code]....

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Networking :: Port Forwarding With IPTables?

May 6, 2011

I have a server running debian squeeze and kvm to virtualize a Windoze box. It's setup to use NAT. This is because of limits on the network by the admin and unfortunately, there isn't a way to get around this.

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Fedora Networking :: How To Forward A Port Using Iptables

May 7, 2009

I need to forward a port to use dtella. I'm using Fedora 10, using iptables for my firewall.

I'm currently trying to forward it from terminal with this command:

Code:
sudo iptables -t nat -A PREROUTING -p udp -i eth0 -d [ip address] --dport 11823 -j DNAT --to 192.168.0.2:80
this is what I get from iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED

[Code].....

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Networking :: How To Enable Or Open Port In The Iptables

Sep 21, 2010

how do i enable or open port in the iptables

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Networking :: Iptables Forward Port To Another Host?

Nov 15, 2010

Lets say i have two machines on public ips. If i get incoming traffic on machine #1 on port 55242 i would just like to forward it to machine #2 on port 35000.I would just like to use machine #1 same way as a dns server works. It just redirects the traffic and tells the client where to go.

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Networking :: Iptables Port Forwarding Not Working?

Jan 28, 2011

I've used iptables since it replace ipchains, and I've never had a problem like this.The problem is, as you can see by the title, that port forwarding simply does not work.

network topology:
Slackware Linux Server:
eth0 - LAN (192.168.0.0/25)
eth1 - DSL Static IP
eth2 - cable Static IP

eth1 is our standard office connection; it handles all of our default traffic (web browsing for the staff, email, etc). eth2 is our VPN connection, as well as use for all incoming connections (www, etc). Behind the linux box I have a series of Windows Server 2008 R2 boxes that are used to run our office software, website, etc - I don't care how nice they make their products these days, I simply don't trust any MS box open to the net.
Therefore, this leaves me with having to port forward port 80 from eth2 to the internal IP address of the web server.

My ruleset is as follows:

$WWW - ip address of the web server
iptables -A FORWARD -d $WWW -p tcp --dport 80 -j ACCEPT
iptables -t nat -A PREROUTING -i eth2 -p tcp --dport 80 -j DNAT --to $WWW

Running ip route shows that I have routing entries for all 3 networks, and I can ping, ssh, etc to any of the addresses without issue. OpenVPN connects across eth2 as well, and all 15 of my VPN tunnels work fine. However - and here's the kicker - if I delete the default route and replace it with the route for eth2, port forwarding works fine.

If we accept that my networks are as follows:

192.168.0.0/25 - eth0 net, gw .1
1.1.1.0/29 - eth1 net, gw .1, eth1 ip .2
2.2.2.0/30 - eth2 net, gw .1, eth2 ip .2

then ip route reveals the following:

2.2.2.0 via 2.2.2.1 dev eth2
2.2.2.0 dev eth2 scope link src 2.2.2.2
1.1.1.0 dev eth1 scope link src 1.1.1.2

[code]....

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Networking :: IPTables Port Forwarding To Routed IP?

Aug 3, 2010

I have a linux server I'm intending to use as a firewall. The server has the following adapters

eth0 - Public IP (VLAN2)
eth0:1 - Public IP2 (VLAN2)
eth1 - 10.241.4.4 (VLAN4)

the Default gateway is my ISPs gateway. Additionally, I have the following route set: route add -net 10.0.0.0 netmask 255.0.0.0 gw 10.241.4.1

I have a server that exists on VLAN 208 at IP 10.241.209.67/21., its GW is 10.241.208.1 (first IP in /21 range)

as it is on the 10.0.0.0/8 network, traffic from the firewall is successfully routed from that server through my router to the FW and out to the Internet. The FW can ping, ssh, etc... the server and vice versa.

I want an iptables rule that will allow me to forward port 4401 on eth0:1 to 10.241.209.67:4401.

Is this possible since the IP is not on the same subnet as eth1, even though it is accessible?

I'm a bit better than a neophyte linux user. I have not made port forwards with it in the past without scripts to assist so I'm looking for not just "it is possible", but also the syntax of how to add it.

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Ubuntu Networking :: Port Forwarding With Arno Iptables?

Feb 20, 2010

iam using arno iptables can give me command to ip forwarding cause my web server behind my router. my ip web server 192.168.0.11 and my ip router on eth 1 192.168.0.1 and eth0 i use to dial up my modem and i use pppoe for that.

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Ubuntu Networking :: Using Iptables To Change A Destination Port But Keep The Ip The Same?

Mar 23, 2010

I am playing around with transparent proxies, The current way I am doing things is the program makes a request to a computer on port 80, I use

Code:
iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234 to redirect to my proxy that I am playing with. the proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy) so I want to do something like

Code:
iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80 The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip? Or am I doing this setup completely wrong,

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Ubuntu Networking :: IPTables Now Showing Port Open?

Sep 22, 2010

I am getting the hang of IPTables.I've setup to open certain UDP ports but they simply refuse to show when I iptables -L.

iptables file:
$IPT -A INPUT -p udp --dport 13000 -j ACCEPT
$IPT -A INPUT -p udp --dport 13001 -j ACCEPT

[code]....

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Ubuntu Networking :: IPTables / Masquerading - Port 80 And 3128

Nov 17, 2010

I am fairly new to Ubuntu/Linux and I have somehow managed to get a server up and running. For the past few months I have been trying to get masquerading working.

I have 2 network cards
eth0=Internal Lan IP address 192.168.0.254
eth1=router External IP address 10.0.0.1

I want all my internal lan traffic to go through my linux box & only have port 80 & 3128 go through squid. So for all pop3/smtp action I want the linux machine to act like a router & for port 80 & 3128 I want it to go through squid.

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Ubuntu Networking :: Iptables And Cannot Get Port Forwarding To Work?

Mar 8, 2011

I've been beating myself over the head with iptables and CANNOT get port forwarding to work. Here's my situation: Static LAN IP on eth0 Static internet IP on eth1 ip_forward is turned on by uncommenting in sysctl.conf Here's the output of iptables-save:

Code:
# Generated by iptables-save v1.4.4 on Tue Mar 8 10:34:12 2011
*nat
:PREROUTING ACCEPT [2443:347058]

[Code]...

Edit: by the way, the intended purpose of this machine is to server as a gateway and firewall. MASQUERADE is working, for whatever that is worth. And the host behind the firewall that is serving up http is definitely working too. All that is not working is getting hosts on the internet talking to hosts behind the firewall.

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Ubuntu Networking :: Port Open In Iptables But Nothing In Netstat?

May 16, 2011

I need the port 27015 to be open. I've opened it in iptables :

Quote:

iptables -A INPUT -p tcp -i eth0 --dport 27015 -j

But when i try :

Quote:

netstat -nan

The port 27015 do not appear as "LISTEN".

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Networking :: IPTables Port Forwarding Using Prerouting Not Working?

Feb 18, 2010

I was trying to setup port forwarding on my setup. My network consists of:

Code:

[Server: xxx.xxx.xxx.15]
|
|
[ switch ]

[code]....

I ran the following 2 commands:

# iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j DNAT --to-destination xxx.xxx.xxx.15:80
# iptables -A INPUT -i eth1 -p tcp -m tcp --dport 80 -j ACCEPT

Yet I am unable to connect. Are these the correct commands? I am using IP Masquedering on the same box using the following commands:

Code:

$IPTABLES -P INPUT ACCEPT
$IPTABLES -F INPUT
$IPTABLES -P OUTPUT ACCEPT

[code]....

I don't think there is a hidden firewall in the switch but if these commands are correct, then I may need to contact my ISP and see if they are blocking the commands. I just wanted to make sure I was not doing some stupid mistake before I try to contact my ISP.

EDIT: Also, is it possible to forward Port 80 requests to different servers depending on the hostname used to connect, so say [URL] redirects to server xxx.xxx.xxx.15 while hhh.com redirects to xxx.xxx.xxx.16?

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Networking :: Setting Time For IPTables To Remember Its Incoming Port?

Mar 9, 2010

I've got a box with 2 interfaces, with IP1 = 192.168.100.1 and IP2 = 10.1.1.1 respectively on them. I've got an iptables rule that looks like:
Code:
iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -d 10.0.0.0/8 -p udp -j SNAT --to-source 10.1.1.1 --random

If I get 2 consecutive packets from the same address and port from 192.168.100.0/24, they get SNAT-ed and come out of the same port on 10.1.1.1. If then I get another packet from the same address and port 10 minutes later, then it gets SNAT-ed, but comes out of a different port on 10.1.1.1. How can I set the time delay I would like iptables to remember its incoming address/port to outgoing port mappings?

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CentOS 5 Networking :: IPTABLES - Should This Rule Take Care Of Port 5090?

Jun 6, 2010

I am new to iptables. The setup tool on a VPS doesn't work. So, I am learning to insert rules. I have inserted so many and some of them show as duplicates now.

1- I want to know how to remove the duplicates. Is there a file that these rules are store in so I can go in and easily edit it?

2- Is there any other utility that handles firewall in Linux that I am unaware of? or is the iptables the ultimate door guard? This is a plain install of CentOS.

3- Since I believe I opened port 5090 but I think it still might be blocked, could SELINUX be the problem? How can I get my way around setting it to permissive or disable if I don't have access to "setup" command?

4- What is the order of iptables reading? does rule #1 supersede all other rules? or does the last rule supersede all rules prior to it?

5- Do the rules below make a fairly safe system? (except for the duplicates which should be remove) I understand that a safe system is dependent also on the applications that are allowed in this category and I am not talking about those. I am talking about dropping all other inquiries and in general is this how iptables are setup? This is what I currently have:

[root@tel ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination

[Code]...

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Networking :: IPtables Port Forwarding \ Have A Computer With Two Interfaces Eth0(LAN) And Eth1(WAN)?

Apr 20, 2011

I have a computer with two interfaces eth0(LAN) and eth1(WAN).I have followed some guides on the internet and came up with this iptables configuration:

# Generated by iptables-save v1.4.4 on Wed Apr 20 09:43:12 2011
*nat
:OUTPUT ACCEPT [0:0]

[code].....

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CentOS 5 Networking :: Iptables Not Opening Port To Connect Via Vnc To A Server Running 5.5?

Apr 27, 2011

I'm trying to open up some ports to connect via vnc to a server running Centos 5.5. I've edited /etc/sysconfig/iptables everything *looks* fine, but I still can't seem to get access to the port I've opened (I added some newlines for clarity between commands):

[Code]....

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Security :: Iptables: Verify Traffic On Port To Check If It Is Legitimate For That Port?

Apr 18, 2011

Is there any way to verify if packets being trafficked over a certain port are valid for the service you want to use this port for?

One obvious example that probably clarifies my question:
When I open port 443 (outgoing or incoming) for https/ssl traffic, I don't want this port to be used for say openvpn traffic.
Thus: when someone wants to surf to a website with https, it should be ok but if someone wants to connect to his home openvpn server over that same port, it should be blocked.

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Server :: If Forward A Port In Iptables, Does The Port Have To Be Open On The Firewall

Aug 5, 2009

If I forward port 80 to port 3128 for squid with an iptable rule, does port 3128 have to be open on the firewall or is this all routed behind the firewall?

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Ubuntu Networking :: Setting Time Delay For IPTables (Incoming / Outgoing Port)

Mar 9, 2010

I've got a box with 2 interfaces, with IP1 = 192.168.100.1 and IP2 = 10.1.1.1 respectively on them. I've got an iptables rule that looks like:
Code:
iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -d 10.0.0.0/8 -p udp -j SNAT --to-source 10.1.1.1 --random

If I get 2 consecutive packets from the same address and port from 192.168.100.0/24, they get SNAT-ed and come out of the same port on 10.1.1.1. If then I get another packet from the same address and port 10 minutes later, then it gets SNAT-ed, but comes out of a different port on 10.1.1.1. My question is: how can I set the time delay I would like iptables to remember its incoming address/port to outgoing port mappings?

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Fedora Networking :: Port Redirect, I.e. Whatever Comes Through Whatever Interface On Port AAAA Will Get Redirected To Port BBBB?

Feb 18, 2010

I want to do a simple port redirect, i.e. whatever comes trough whatever interface on port AAAA will get redirected to port BBBBI thought that iptables -t nat -I PREROUTING --source 0/0 --destination 0/0 -p tcp --dport AAAA -j REDIRECT --to-ports BBBBhowever it doesn't work, e.g. nc -v -w2 -z localhost AAAA gives:

nc: connect to localhost port AAAA (tcp) failed: Connection refused
while
nc -v -w2 -z localhost BBBB

[code]....

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Red Hat / Fedora :: IPTables In Part Of SSH (Port 22)

Jun 1, 2011

I have blocked all connection with iptables and allowed only the loopback:
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP

Next I want to allow only ssh connections, and also I want to record the IP address of each attempt to access port 22 using the recent module. Then I want to to see if that IP address has attempted to connect 2 or more times within the last 60 seconds, and if not then the packet is accepted:
iptables -A INPUT -p tcp --dport 22 -m recent --set --name ssh --rsource
iptables -A INPUT -p tcp --dport 22 -m recent ! --rcheck --seconds 60 --hitcount 2 --name ssh --rsource -j ACCEPT
iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp --sport 22 -j ACCEPT
iptables -A INPUT -j DROP
iptables -A OUTPUT -j DROP

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