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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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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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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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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Mar 31, 2009
I need to know what the Iptables "code" is to change the outgoing/Incoming IP for port 53 (DNS). I'm running CentOS on a dedicated server. I very familiar with Putty and SSH. So I don't need much details, I just can't figure this out. I asked my server providor but they deleted my ticket and didn't answer me.I tried this but am not sure if this correct of working?
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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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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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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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Apr 16, 2011
Have previously moved my ssh server from 22 to 4455 just by moving the port in sshd_config. This is done to minimize the log entries resulting from brute force attacks.However, it seems like Zimbra and other local services expect to find the ssh service locally available on port 22, so I figured it's better to move the port in the firewall so that it remains configured on port 22 in sshd_config, and instead use iptables with a nat/port rewrite to move 4455 incoming to 22 locally.
Isolated this works as long as I also keep allowing port 22, but the moment I close port 22, port 4455 is also dead, which sort of defies the purpose
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Jul 22, 2010
I'm having a mare with SSL with Apache. I have set it up and if I go to the follwoing address http://192.168.1.2 it seems to work and the pages are delivered to my browser. However if I try to access it from an exernal PC it will not work.
I can get to the non-ssl part of the site so the static ip is resolved and the port forwarding all works.
Does any one have any ideas (and in fact i think I may have just solved it - Ports - 80 mis open but I haven't done anything with 443. Will check it out and post back.
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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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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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Jan 20, 2010
I get today a server with CentOS.. and someone told me to block access to port 22 for all IP's except my.. so I did
Code:
iptables -A INPUT -p tcp -s my_ip --dport 22 -j ACCEPT
and after
[code]...
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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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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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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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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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Jun 16, 2011
how to set an external static IP address to forward to an internal static IP address. Here is an example:
Linux box (slackware) IP address =
eth0: 10.xxx.xxx.xxx (internal)
eth1: xxx.xxx.xxx.170
eth1.0: xxx.xxx.xxx.171
eth1.1: xxx.xxx.xxx.172
DVR system that I need to forward to: IP address =
xxx.xxx.xxx.251
xxx.xxx.xxx.252
This was all setup by someone else whom I have never spoken with. The IP tables seems to be set up but I cannot provide a screen shot at this time. What I need to do is this. When a user connects to the external static IP address of xxx.xxx.xxx.171 with their DVR software, IP tables will forward to the DVR system at xxx.xxx.xxx.251. The ports desired are 554,555,556, and 557. I know some about Linux but not about IPtables.
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May 4, 2010
I`m running a rather simple iptables script, but no matter what port i try to forward it wont open. Here are the basics:
Code:
ipt="/usr/sbin/iptables"
$ipt -F
[code]...
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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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Feb 28, 2011
I've recently installed 10.10 server edition, and I must say it was a pleasant suprise, it's just the way I like it. I use it as a squeezebox-server. But I've run into a problem with the firewall. I did a portscan, which told me there are more ports open then I've told UFW to open. Among which port 25 and 119, when I telnet from another PC to those ports, the connection gets accepted, although there is no answer to any commands (as expected, there's no mail server running). Iptables print-outs also don't mention anything about the respective ports or a daemon that could be responsable, and the same applies to "ps -e" or "ps aux".
Iptables seems to be working, when I remove the rules to allow samba to work, I can't reach the shares, and when I insert them again I can reach the shares. "sudo ufw deny from any" as last rule doesn't change anything either (deny incoming is default (although I never issued the command "ufw status verbose" says it is) so it shouldn't, but ports 25 and 119 shouldn't be open either).
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Sep 21, 2010
how do i enable or open port in the iptables
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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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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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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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Jan 23, 2011
Is it possible to open dyndns port at iptables?I have a remote server which is cenots 5.5 x86 and uses iptable rules. And my local pc is windows 7 x64 and have a dyndns address as mypc.dyndns.org.I want to connect local pc with mypc.dyndns.org to remote server with iptable rules as follows.Quote:
# Xmanager
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 6000:6010 -s mypc.dyndns.org -j ACCEPT
[code]...
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Dec 24, 2010
I'm trying to open port 119. I already have a few ports open. I've used webmin to open both incoming and outgoing ports. iptables --list --numeric gives me:
Code:
...
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:10000
[code]....
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Jan 9, 2010
I want to do port mapping on a linux machine using iptables.I have a service listeneing on port 2000 udp and I want to add iptables rule, which will map incoming packets on port 2001 to port 2000, so that service will accept the connections.The idea is that I don't want to change the default port for the service, but to make internal port redirection from (2001 to 2000), so the default service port will be filtered by iptables, and the other port will be open to the outside. The internet host connects to the linux machine on port 2001. The linux machine change destiation port from 2001 to 2000 and the service (on the same machine) process the packets and accepts the connection.I tried adding the following to my iptables rules, but it didn't work out:
$IPTABLES -A FORWARD -p udp --destination-port 2001 -j ACCEPT
$IPTABLES -t nat -A PREROUTING -i eth0 -p udp --dport 2001 -j REDIRECT --to-port 2000
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Mar 26, 2010
I have the following setup and Im trying to forward all incoming connection on port 1194 on eth2 which is the external network to ip 192.168.10.100, but seems its not working.
Current config:
# Generated by iptables-save v1.3.8 on Sun Nov 16 00:00:54 2008
*nat
:PREROUTING ACCEPT [26751696:2175544875]
:POSTROUTING ACCEPT [339911:19096812]
[code]....
plus im adding the prerouting:
iptables -t nat -A PREROUTING -i eth2 -p tcp --dport 1194 -j DNAT --to-destination 192.168.10.100
This configuration doesnt work. I also I have tried:
iptables -D PREROUTING -t nat -p tcp -d XX.XX.XX.XX --dport 1194 -m state --state NEW,ESTABLISHED,RELATED -j DNAT --to 192.168.10.100:1194
and the same its not working. Connecting thru telnet to the domain: telnet mydomain.org 1194 doesnt work, but within the server, running telnet 192.168.10.100 1194 it works.
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Jul 12, 2011
i've got a software that uses a specific tcp port e.g 11111. i want to redirect all the traffic from 11111 to squid port 3128. i'm using the following commands to redirecting:
iptables -t nat -A PREROUTING -p tcp -m tcp -i eth0 --dport 11111 -j DNAT --to 192.168.0.1:3128
iptables -A FORWARD -p tcp -m tcp -i eth0 --dport 11111 -j ACCEPT
my ubuntu server has two interfaces. eth0 is for local network (dhcp assigns ips) and eth1 is for internet. my ubuntu server acts as a gateway and as an authentication server for users.
at squid also i have the following configuration regarding my port:
acl myport port 11111 http_access allow CONNECT myport. my squid installation is not transparent as users need to authenticate in order to access the web.
my application is a windows application and of course is not working. i examined the packets with wireshark and i noticed that when the program tries to access the internet, squid replies with err_invalid_request (the packet contains that data). the program is trying to send some plain text via port 11111 and as far as i can image, somehow squid declines the data. i cant get rid off squid as i want to pass the traffic from squid. what is the problem?
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