Suse Doc: Security Guide - Su. SEfirewall. 2. The following paragraphs provide step- by- step instructions for a. Each configuration item is marked as to. Use port range. (for example, 5. Aspects. related to the DMZ (demilitarized zone) as mentioned in the. They are applicable only to a. First, use the Ya.
Linux Firewall Configuration and Setup - iptables. Table of Contents. The logwatch package makes nice daily summaries of the firewall logs. Here is the iptables file. I save the current iptables firewall rules with.
ST module System Services (Runlevel) to enable Su. SEfirewall. 2 in. It sets the symlinks for the. Su. SEfirewall. 2_* scripts in the /etc/init. FW_DEV_EXT (firewall, masquerading). The device linked to the Internet.
For a modem connection, enter. For an ISDN link, use. DSL connections use.
Ali on Tomcat: Redirect default home page to another URL. View running Junos applications: show configuration groups junos-defaults applications. file list directory.
Specify auto to use the. FW_DEV_INT (firewall, masquerading).
The device linked to the internal, private network (such as. Leave this blank if there is no internal. FW_ROUTE (firewall, masquerading).
- I know how to configure iptables itself but SUSE's firewall confuses me. Firewall configuration Quetschke wrote. # READ THE EXAMPLE CUSTOMARY FILE AT.
- . 2 x 120 GB SSD, openSUSE Tumbleweed+Leap. to manage the firewall w/ puppetlabs product, puppet. However, I cannot find a clear cut way to manage this from it's configuration file. Managing SuSE Firewall.
- The best/only comprehensive Linux system configuration & installation tool. Kiwi (Go to link). The efforts of the community have created several great tools for Linux and an awesome distribution. With openSUSE.
- SolutionBase: Configure a firewall in Linux using SuSe's YaST. Our environment will include will be a server set up with OpenSuSE 10.2 and two. Now you're ready to get into the nitty-gritty of firewall configuration.
- It can also be made manually in the file /etc/sysconfig/SuSEfirewall2. IMPORTANT: Automatic Firewall Configuration. After the installation, YaST automatically starts a firewall on all configured interfaces.
- SuSEfirewall2 tagline: From openSUSE. SuSEfirewall2 is a stateful network packet filter also known as firewall. A YaST Firewall configuration module is. from configuration stored in the /etc/sysconfig/SuSEfirewall2 file.
If you need the masquerading function, set this to. Your internal hosts will not be visible to. Internet routers. For a firewall without masquerading, set this to. Your internal hosts need to use officially registered IP.
Normally, however, you should. FW_MASQUERADE (masquerading). Set this to yes if you need the masquerading.
This provides a virtually direct connection to the Internet. It is more secure to have a proxy server.
Internet. Masquerading is not needed for services that a proxy server provides. FW_MASQ_NETS (masquerading). Specify the hosts or networks to masquerade, leaving a space between. For example. FW_MASQ_NETS="1.
FW_PROTECT_FROM_INT (firewall). Set this to yes to protect your firewall host from. Services are only. Also see. FW_SERVICES_INT_TCP and.
FW_SERVICES_INT_UDP. FW_SERVICES_EXT_TCP (firewall). Enter the TCP ports that should be made available. Leave this blank. FW_SERVICES_EXT_UDP (firewall).
Leave this blank unless you run a UDP service and want to make it. The services that use UDP include include. DNS servers, IPsec, TFTP, DHCP and others. In that case, enter the.
UDP ports to use. FW_SERVICES_ACCEPT_EXT (firewall).
List services to allow from the Internet. This is a more generic form. FW_SERVICES_EXT_TCP and.
FW_SERVICES_EXT_UDP settings, and more. FW_TRUSTED_NETS. The notation. SSH connects per minute from.
IP address. FW_SERVICES_INT_TCP (firewall). With this variable, define the services available for the internal. The notation is the same as for. FW_SERVICES_EXT_TCP, but the settings are.
The variable. only needs to be set if FW_PROTECT_FROM_INT. FW_SERVICES_INT_UDP (firewall). See FW_SERVICES_INT_TCP. FW_SERVICES_ACCEPT_INT (firewall). List services to allow from internal hosts. See. FW_SERVICES_ACCEPT_EXT. FW_SERVICES_ACCEPT_RELATED_* (firewall).
This is how the Su. SEfirewall. 2 implementation considers packets. RELATED by netfilter. For example, to allow finer grained filtering of Samba broadcast. RELATED packets are not accepted.
Variables starting with. FW_SERVICES_ACCEPT_RELATED_ allow. RELATED packets handling to certain. This means that adding connection tracking modules (conntrack. FW_LOAD_MODULES does not. Additionally, you must set variables starting with. FW_SERVICES_ACCEPT_RELATED_ to a suitable.
FW_CUSTOMRULES (firewall). Uncomment this variable to install custom rules. Find examples in. Su. SEfirewall. 2- custom.
After configuring the firewall, test your setup. The. firewall rule sets are created by entering rc. Su. SEfirewall. 2. Then use telnet, for example, from an external host.
After that, review. Other packages to test your firewall setup are Nmap (portscanner) or. Open. VAS (Open Vulnerability Assessment System). The documentation of.
Nmap is found at /usr/share/doc/packages/nmap after. VAS resides at. http: //www.
Solution. Base: Configure a firewall in Linux using Su. Se's Ya. STThis article is also available as a Tech.
Republic download. In today's network. If you're new to.
Linux administration, the thought of creating a firewall using an entire iptables. Fortunately, there's a GUI way to build a. Linux firewall using Su. SE's Ya. ST2. With a kit full of fundamental software.
Ya. ST2 takes the prize for best prepared. In this article, we are. Ya. ST2 firewall tool and set up a firewall on a desktop.
Our environment will include will be a server set up with Open. Su. SE. 1. 0. 2 and two Ethernet cards. A quick look around Ya. STAlthough it is contrary to.
Linux administrators would advise, I'm going to log into my Su. SE 1. 0. 2. machine as root for this setup. I don't do this often, but it saves me from. I want to perform an. Once you are done setting up these services, log out. The first thing you'll. Computer menu, as shown in Figure A.
Figure AThe new GNOME 2. From the menu, select the. Control Center entry, as shown in Figure B. Figure BThe Control Center is grouped in both.
Groups and Common Tasks. Select the Administrator. Settings from the Common Tasks section to open the Ya. ST Admin Tool. You'll then. Figure C. Figure CIt should be obvious that Network Services is your next destination. Select Network Services to.
Network Services that can be configured from. Ya. ST, as shown in Figure D. Figure DA nice collection of GUI tools to help you configure your Linux server. Select the Security and. Users link from the left side of the Ya. ST control center, as shown in Figure. E. Figure EThere are a number of security options, but the Firewall is the obvious.
Double- click the Firewall. Once you've opened up the Ya. ST Firewall tool, the first screen you will. Figure F. Now you're ready to get. Figure FThis view is in Tree mode. If you click the Help button at the bottom left. Configuring the firewall.
The first thing you should. This is the default setting.
Once you've double- checked that the firewall is configured to start at boot- up. Next or select the Interfaces link in the left pane. The interfaces window will.
As you can. see in Figure G, I have an Accton EN- 1. D card and a Silicon Integrated. Si. S9. 00 card available. The Silicon card had already been installed for the. OS, so it was pre- configured to connect directly to a.
The Accton has yet to be. Figure GIf you do not assign a zone to a device, no traffic will be allowed through.
Note: One of the things you will need to do is make sure. If you need to assign. Custom. button. Since I already have the. Silicon card set configured for a zone, we'll use the Accton card as an example.
Highlight the card you want to configure and. Change (near the bottom) to open up the zone configuration window. You'll. see the screen shown in Figure H.
Figure HYour choices are No Zone, Demilitarized Zone, Internal Zone, and External. Zone. Once you have configured.
Allowed Services. If you are in Help mode, you will not see. Allowed Services button. To see the button, press the Tree button. In the Allowed Services. Demilitarized Zone, the Internal. Zone, and the External Zone.
As you can see in Figure I, I already. DHCP, DNS, HTTP, SSH, Samba, and TFTP open to the external zone. Figure IThis is not a secure setup. This isn't a very good. Most of those services should only be open to the internal zones. In this. case, we need to remove DHCP, DNS, Samba, and TFTP from the external zone. To do so, highlight the.
Remove button. Now the only services. HTTP and SSH. Let's say we need to.
POP server access to the external firewall. To do this, open the Service To. Allow drop- down, select the type of service (we'll choose POP3 Server), and press. Add. POP3 will now be allowed through the external zone (once these changes. Securing the internal zone. Now we'll take a look at.
From the Allowed Services For The Selected Zone drop- down. Internal Zone. Every listing is gray, indicating nothing is configurable. Figure J. Figure JAs it is, there is nothing you can do. If you want to block any.
Protect. Firewall From Internal Zone check box. Once you do that, you may add or remove. Take notice of the. Protect Firewall From Internal Zone check box: If it's unchecked, all services. Once you check that box, all services are removed from the list; you.
This same tool also allows. Network Masquerading. To do this, press the Masquerading. By default, masquerading is off. Select the. check box for Masquerade Networks to enable this service. Here you can add or.
Figure K. Figure KAlthough masquerading is enabled, it will do nothing until you add a. Press the Add button to. Add Masqueraded Redirect Rule window, as shown in Figure L. Figure LIf the configuration is not completely and correctly entered, the redirect.
Let's say you want use secure. For this, you'll. The Requested IP, as the IP shown. The protocol will be set to TCPThe requested port will be 2. The redirected IP will be the IP.
The redirected port will be that. SSH server. Finish that and press Add. Figure M shows the newly added SSH service redirect.
Figure MYou can remove the new service by highlighting it and pressing Remove. With your redirects in. Select the Broadcast link from. Within the Broadcast configuration window, enter a. As you can see in Figure N, I am allowing CUPS and Samba broadcast.
Figure NIf your network is large, you might want to deselect Log Not Accepted. Broadcast Packets.
The final two. configurations are IPsec Support and Logging. To enable IPsec, press the IPsec. Select the Enabled check box and then press. Details button to determine how to trust IPsec. Figure O shows what. Figure OYour choices are: Same Zone as Original Source Network, Demilitarized Zone.
Internal Zone, and External Zone. Finally, you can configure. You can configure how to log Accepted and Not Accepted Packets. Your. choices in configuration are: Critical, All, or None as seen in Figure P. Figure PRemember, the larger your network, the more logging your server will have.
Once you have configured. Next button to create the summary of your configurations, as. Figure Q. Figure QIf you press the Back button, you will be returned to the Start Up screen. Press Accept (if the. Final thoughts. When I started using.
Linux, setting up a firewall in Linux meant working at the command line using. Setting up a Linux firewall. GUI- driven program. Ya. ST2 has given Linux.
Firewall tool is a perfect addition to that toolset.