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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 ports


In the previous example, where the squid service only required a single port, we could easily add a port rule to allow access to a service. Although the process is simple, in some organizations, the preference will still be to create the service file that documents the need of the port in the description field.

If we need to add a port, we have similar options in --add-port and --remove-port. The following command shows how to add the squid TCP port 3128 to the work zone without the need to define the service file:

# firewall-cmd --permanent --add-port=3128/tcp --zone=work
# firewall-cmd --reload
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