August 2015
Intermediate to advanced
364 pages
7h 35m
English
Content preview from Mastering OpenVPNBecome 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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Checking broadcast and non-IP traffic
The tcpdump and wireshark tools are useful for troubleshooting an "almost-working" OpenVPN setup. Wireshark is available for Linux, Mac OS X, and Windows. It can be used as a command-line tool but most often the GUI-based version is used. On most Unix/Linux-based platforms, the command-line tool tcpdump is also available.
We will now use tcpdump and wireshark to view the flow of packets over a tap-based VPN setup.
Address Resolution Protocol traffic
One of the most basic types of Ethernet traffic present on all networks is Address Resolution Protocol (ARP) traffic. ARP is a prime example of an Ethernet protocol that does not travel across point-to-point links (such as tun-based OpenVPN setups). The physical layer ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.