Network Tuning
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Video Transcription
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>> Hey, there Cyberians.
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Welcome back to the Linux Plus course here at Cybrary.
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I'm your instructor Rob Gaus,
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and in today's lesson,
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we're going to discuss network tuning.
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Now upon completion of today's lesson,
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you're going to understand the purpose of this
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sysctl.conf file and you're going to
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know why you would need to modify this file if
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you needed to play around with network configuration.
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The sysctl.conf file is used to
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set persistent kernel parameters.
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You can use the sysctl command
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to play with kernel parameters, but it's non-persistent.
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In other words, you would use this sysctl to
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tune kernel parameters that you wanted to change.
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Then once you're sure that you'd like those changes,
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you persist the changes by
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making modifications to sysctl.conf.
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The kernel settings in sysctl.conf are enabled on boot.
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In other words, as the system boots up,
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it reads from sysctl.conf to ensure that the files
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are put in place and
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the settings are put in place from this file.
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The sysctl.conf is mentioned in this module
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specifically because it contains
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tuning settings for networking.
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If you wanted to disable ping,
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if you wanted to disable responding to ping,
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make sure that your system doesn't respond to pings and
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maybe fall prey to an attack, ping flood attack.
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You can set icmp_echo_ignore_broadcasts = 1.
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If you had to enable bridging or NAT or masquerade,
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you would set ip_forward = 1 and we'll talk more
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about masquerade when we get to Module 19,
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towards the tail end of the course.
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If you had to persist bonding,
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you can set a bond inside of sysctl.conf using the
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alias <bond name> or the
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option <bond name> and saying the mode,
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remember we talked about the different
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bond modes in an earlier lesson.
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But with that being said in this lesson,
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we covered the purpose of sysctl.conf and some of
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the modifications you might want to make
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to the sysctl.conf for networking.
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Thank you so much for being here and I look
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forward to seeing you in the next lesson.
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