Networking :: Configuring IPtables Security Of CPU
Mar 3, 2009
I new in Linux, I have a Centos5 since sunday and well I have to configure the iptables security of this cpu, I read a lot of examples of iptables in the internet and also another Thread from here but Really a don't know what to do, I saw lots of codes but first of all I don't know where I have to write that and my teacher don't want to help me in this homework. I tried to write the codes in applications --> accessories --> Terminal
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Jun 20, 2010
I'm running Ubuntu 10.04 LTS as a VM in Hyper-V, and accessing it via VNC with a machine in the same broadcast domain. I'm using OpenVPN to connect to XeroBank. I have instructions for configuring iptables to permit establishing and using the XeroBank connection, while blocking all other traffic on eth0. I've followed them successfully. I need to also permit the VNC connection, and haven't managed that. FWIW, the VM is at 192.168.111.12::5900 and the workstation is 192.168.111.2.
The attachment to this post lists the recommended contents for each Shorewall file. Which files need changed, and what do I add to each?
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Apr 26, 2009
I've tried both the firewall interface that comes with Fedora and Firestarter, neither can configure as I want. So I think I'm going to have to do it by hand. In this laptop I have one 10/100 Nic and one wifi connection, at times either of them can be connected to the network. How can I configure IPtables so that any traffic is allowed out, nothing is allowed in (other than std stateful firewall replies), no icmp and that the fw logs any attempts to connect to the laptop?
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Apr 27, 2011
Because my ISP is blocking every IP port under 1000, I'd like my local nat'ed server to be able to translate incoming and outgoing traffic from some port above 1000 to the default server port locally.Example :
To connect to my IMAP server (default port : 143) from the outside,I'd connect to my public IP, port 1143 (opened and nat'ed to the right server on my router) and the server would translate this port to 143 on the same machine.I wish I could simply configure my router to do that but sadly Linksys doesn't permit such setting... I also could modify the listening port of my server but I prefear to keep the default port inside my network.I think that iptables is the right tool to do that and I never used it and I must say that this tool is not so easy to configure at first sigh
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Mar 10, 2011
I need with some iptables rules. I've done all I can, Googling all over, to cover as many exploits as possible and the following script is what I've come up with. The current set up works and I've checked with NMAP. I just need some sort of confirmation that this is pretty much what I can do.
Code:
LAN="eth0 eth1"
RANGE=10.1.0.0/17
WAN=eth2
# Delete all existing rules
[code]....
Also, if I wanted a broadcast to be relayed to all subnets within a defined range, how would such a iptables rule look like? I need this in order to find a networked Canon MP640 printer.
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Nov 11, 2009
I've been tasked with setting up a RHEL FTP server to mirror one we currently have. From what I've read, I need to install and configure VSFTPD and then configure IPTables. From what I've been able to come up with, I need to follow the steps in this article to install and setup VSFTPD. Is this a good complete article to follow you think?Also, how do I copy the iptables config from that server to my new one? I think that iptables on our current server only allows certain IPs or blocks certain IPs (not sure which), so I need to have it do that on my new server as well
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May 21, 2011
I recently installed Bastille as one of several programs to protect my new install. When I was going through the configuration, I was under the impression selecting to disable single user login would still allow me to login using my root password. On the graphical login screen it does not work.When I boot in recovery mode (I had a dual-boot installed), I can login in fine, but this is in a command line/terminal like screen. I attempted to re-configure Bastille using this screen, and here are my lackluster results.Command:/usr/sbin/InteractiveBastille -cThis command takes me through the questioning phase, but at the end I receive this error message when trying to save the new configuration.Failed to open log file /var/log/Bastille/action-log: Permission Deniedand ERROR: couldn't not write to etc/Bastille/config (exact wording!)I am not sure how to remedy this. I am tempted to try to uninstall Bastille and try something else, but I do want to have a security package as I file share.
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Jan 17, 2010
I am currently trying to make my computer as secure as it can possibly be. I am configuring the firewall to be restrictive by default, but I have some programs that are still unable to connect to the internet.
1. Pidgin Internet Messenger (I use AIM and MSN)
2. Skype
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Oct 16, 2010
how can I configure a new "stored secret" in Seahorse? Or System > Preferences > Passwords and encryption keys, in a free translation from Brazilian Portuguese "Senhas e chaves de criptografia"? For instance, let's say I want to add a stored secret to be used with Skype: in Seahorse (Ubuntu 10.10), I clicked on Files > New > Stored secret, select the "login" keyring, type "Skype" in the description field and my skype password in the "Password" field and finally click "Add". But when I right-click the new secret > Properties, I can't change or type anything in the "Details" or "Applications" tabs, So, how can I inform Seahorse how, when or with what should it use my secret?
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Feb 1, 2009
I have been struggling with this for a very long time now. I have installed Fedora Core 9 on my computer. I have set it up as a caching-nameserver and this is working.
Then I wanted to secure my server with iptables, and I have so far made this script:
# Load the connection tracker kernel module
modprobe ip_conntrack
iptables -F
iptables -P INPUT DROP
iptables -P FORWARD DROP
[Code]....
I can reach the dns server with ping. When trying Nslookup it says that it got SERVFAIL from 127.0.0.1 trying next server, and then it times out.
My resolv.conf file lists:
nameserver 127.0.0.1
nameserver DNS-server
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Dec 14, 2009
Im pulling my hair out trying to get ftp to work through iptables.Im using vsftpd
Table: filter
Chain INPUT (policy DROP)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
[code].....
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Feb 25, 2010
I have a problem with iptables, when I execute
[code]....
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Apr 4, 2010
I am trying to figure out how I can configure IPtables to only allow VNC traffic to an internal server over SSH.
My configuration is WAN < --- > Gateway (Ubuntu 9.10 Server) < --- > Internal Server (that I want to control with VNC over SSH)
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Dec 5, 2010
I am using Fedora on my desktop pc. I want to know how can i protact my PC from outside world. What firewall policy should i implement in iptables to keep it more secure.
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Jan 5, 2010
I'm following an openvpn installtion how to and it says to add this to the iptables:
Quote:
# External Interface for VPN
# VPN Interface
VPNIF="tun0"
VPNNET="172.16.0.0/24"
VPNIP="172.16.0.1"
### OpenVPN
[Code]....
Any thoughts as the whole formatting is separate and has the addition of FORWARD rules, etc. I need the VPN running on the .199 address
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Jun 3, 2010
i set up a dmz to have a internet web server and ftp server, and ssh only from local network, so i wrote a iptables script to load during boot :
[Code]...
The problem is that everything works fine ( i have the same rules for other services such as samba, nfs, mysql on another server) BUT ftp there is no way to make it work. not even locally.when i try to connect, i log in, but while listing the directory i get MLSD ... and it hangs like this for a moment, then i get error message "connection time out" , "impossible to list directory". if i turn off the iptables script no problem,ftp works fine.. but why all services work and ftp no?
how do i have to modify the rules? what is strange also is that if i set as OUTPUT policy "accept", the server seems to be offline."host unknown" error message. I was thinking the rule INPUT is fine cause at least i can login, but the dir list is not going out, so gotta modify output rules. or state?
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Mar 19, 2010
I've started a new job and have inherited a couple of RHEL4 64-bit servers. The firewall on them is currently disabled. I'm struggling to get them up and running as iptables is not the most user-friendly application. This lead me to downloading and trying a GUI front-end: Guarddog. Great app! But it doesn't have the default behavior I'm looking for. Here is what I need:
Default behavior: Firewall should be wide open, allowing ALL ports/IP's/TCP/UDP in and out of the server.
Blacklist: Oracle TCP port 1521 needs to be blocked in/out of the server.
This will help get us passed our company's security vulnerability scan. (We aren't able to patch/upgrade Oracle at this time because we'd lose vedor support with a legacy app). I will use these settings as a starting point, and then once I learn more and get more comfortable with iptables (or a GUI app) then I can fine tune things to make them more secure. As far as I know (correct me if I'm wrong) once I get a script I just copy it into /etc/rc.firewall and it will load when iptables starts.
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Mar 6, 2010
Is this how I would do that?
iptables -A INPUT -p tcp --destination-port 21 -d ! 168.192.1.2 -j DROP
This should block all incoming connections on port 21 from 192.168.1.2, correct? Thus preventing that IP from logging into my FTP.
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Mar 17, 2009
What i wanted to do was block everything from getting in my pc but still be able to surf the web and still use instant messenger.
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Jan 14, 2010
i ran this
Code:
iptables -N rate-limit
iptables -A rate-limit -p tcp -m conntrack --ctstate NEW -m limit --limit 3/min --limit-burst 3 -j RETURN
iptables -A rate-limit -j DROP
iptables -I INPUT 1 -p tcp --dport 22 -j rate-limit
i am no longer able to ssh in to the machine , how can i reset iptables and firestarted back to default?
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Jul 24, 2010
i need to open this address ftp.nai.com, is there a way to use address not ip in iptables?
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Sep 17, 2010
I've recently moved from Firestarter to UFW/GUFW, and I wonder if someone could confirm if my iptables configuration is secure.
When I enter sudo iptables -L i get:
Code:
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Dec 29, 2010
eth1 has connection to the net via gateway ..eth0 on the same machine has users on a intranet and needs access to the internet, i need to allow internet connection and prevent packets which logically originate from the internet getting into the intranet
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Apr 21, 2011
Installing a router, and I need to completely "wipe" iptables (flush I mean) on both computers, and I think I run ufw/gufw on both, so that would need to be uninstalled. The router is very secure, has NAT, etc, etc, and I'd rather setup all that side of things in one point, rather than on each computer.
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May 23, 2011
Can I have both ufw and iptables running together? My server is currently using ufw, if I add an iptables rule will it have any effect?
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Feb 21, 2011
After discovering that the firewall was wide open I decided to finally study the iptables docs and learn how to add rules. Now, I've not yet finished reading guides and documentation but I'd like some advice before I set the default policy on the input chain to deny. I have added a permissive rule for the loopback adapter so that programs that use it do not become mute suddenly. I will also use netstat to see what ports to open for each program that connects to the internet. I'm not that interested in what ports to open but how to find what ports to open.
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Mar 30, 2011
We do NOT support samba on our Unbuntu servers but still zillions of windows machines are constantly trying to connect on the SMB ports. I've added a rule that drops access to destination ports 137-138 and that seems to work. But it creates many many log entries documenting that the packet has been dropped. I've been researching and cannot come up with a way to suppress logging for these drops.
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Aug 8, 2010
Is possible blocking web with content for adults with iptables?
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Jan 30, 2010
proper use of iptables and tell me good books for indepth study
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Jul 23, 2010
Now I managed to get iptables to work with my OpenVZ configurations and everything seems to work as it should. However when I run iptables -L I can only see source for the second SSH rule, why isn't the first ones source/IP shown? Also if you have any comments about the setup feel free. I'm running SSH, Apache and local MySQL
The xxx.xxx is simply to hide my IP's
Code:
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DROP
iptables -F
iptables -F INPUT
iptables -F OUTPUT
iptables -F FORWARD
iptables -F -t mangle
iptables -X
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -d 127.0.0.0/8 -j REJECT
iptables -A INPUT -p tcp --dport 22 -s 77.213.xxx.xxx -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -s 62.198.xxx.xxx -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -m state --state INVALID -j REJECT
iptables -A INPUT -j REJECT
iptables -A INPUT -j DROP
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