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Learning RHEL Networking

You're reading from   Learning RHEL Networking Gain Linux administration skills by learning new networking concepts in Red Hat Enterprise Linux 7

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781785287831
Length 216 pages
Edition 1st Edition
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Toc

Table of Contents (13) Chapters Close

Preface 1. Introducing Enterprise Linux 7 FREE CHAPTER 2. Configuring Network Settings 3. Configuring Key Network Services 4. Implementing iSCSI SANs 5. Implementing btrfs 6. File Sharing with NFS 7. Implementing Windows Shares with Samba 4 8. Integrating RHEL 7 into Microsoft Active Directory Domains 9. Deploying the Apache HTTPD Server 10. Securing the System with SELinux 11. Network Security with firewalld Index

Firewall rules using services


When we think of firewalls, we think of allowing or denial of access to ports. The use of service XML files can ease the port management with one service, perhaps listing multiple ports. The other point to take note of is that firewalld daemon's default policy is to deny access, so any access needed has to be explicitly granted to a port associated with a service. To list services that have been allowed on the default zone, we can simply use the --list-services option, as shown in the following example:

# firewall-cmd --list-services

Similarly, we can gain access to services allowed in a specific zone by including the --zone= option. This can be seen in the following example:

# firewall-cmd --zone=home --list-services

The output from this command is shown in the following screenshot. It lists services associated with the home zone:

As you start enabling services, you can easily allow a predefined service through a zone. Predefined services are listed as XML files...

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