Being old and of itself isn’t bad. A lot of us are still using IPv4, and everything still applies. To few people know the basic concepts in this tutorial and can’t patch/fix problems that are trivial on any server.
OTOH, it’s really long for a tutorial and starts with a dissection of IP headers, the audience who needs it most have probably tuned out after the first dozen, and certainly by STCP.
OTOH, it’s really long for a tutorial and starts with a dissection of IP headers, the audience who needs it most have probably tuned out after the first dozen, and certainly by STCP.