October 2015
Intermediate to advanced
458 pages
10h 49m
English
Content preview from Red Hat Enterprise Linux Troubleshooting GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 6. Diagnosing and Correcting Firewall Issues
In the previous chapter, we discovered how to troubleshoot networking-related issues with commands such as telnet, ping, curl, netstat, tcpdump, and ip. You also learned how the TCP protocol works, as well as how domains are translated to IPs using DNS.
In this chapter, we will once again troubleshoot network-related issues; however, this time we will discover how Linux's software firewall iptables works and how to troubleshoot network issues generated by a firewall.
Diagnosing firewalls
Chapter 5, Network Troubleshooting, was all about networking and how to troubleshoot a misconfigured network. In this chapter, we are going to extend that discussion to firewalls. While troubleshooting firewalls ...
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