This semester, I'm teaching my class on System Administration / Internet Operations once again.
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System Administration: Week 4: Package Management
In this video, we continue our discussion of the difference and relationship between the operating system and so-called "add-on software". We conclude that in order to install and maintain all such software, we want to use a package manager, and illustrate common features by example of the 'dpkg', 'rpm', and #NetBSD's #pkgsrc tools.
System Administration: Week 4: Package Management Pitfalls
In this video, we discuss some of the problems with package managers, native language packaging solutions, and the implications of their use on dependency resolution, package integrity, and trust. We revisit "left-pad" and "dependency confusion" to illustrate some of these problems.
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System Administration: Week 4: Package Management Pitfalls
In this video, we discuss some of the problems with package managers, native language packaging solutions, and the implications of their use on dependency resolution, package integrity, and trust. We revisit "left-pad" and "dependency confusion" to illustrate some of these problems.
System Administration: Week 5: Networking I: Layers
In this video, we begin our longer discussion on the topic of "networking". We're using tcpdump(8) to capture a single TCP SYN packet and start looking at the MAC and IP information, teasing out each individual byte. And don't worry, we dunk on the OSI stack model as needed and popular these days.
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System Administration: Week 5: Networking I: Layers
In this video, we begin our longer discussion on the topic of "networking". We're using tcpdump(8) to capture a single TCP SYN packet and start looking at the MAC and IP information, teasing out each individual byte. And don't worry, we dunk on the OSI stack model as needed and popular these days.
System Administration: Week 5: Networking I: IPv4 Basics & CIDR subnetting
In this video, we cover the basics of the 32-bit IPv4 address and how we organize networks using Classless Inter-Domain Routing or CIDR subnetting. (Don't worry, we'll get to #IPv6 in the next video.)
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System Administration: Week 5: Networking I: IPv4 Basics & CIDR subnetting
In this video, we cover the basics of the 32-bit IPv4 address and how we organize networks using Classless Inter-Domain Routing or CIDR subnetting. (Don't worry, we'll get to #IPv6 in the next video.)
System Administration: Week 5: Networking I: IPv6 Basics
In this video, we get familiar with our Big Hero IPv6, looking at the structure of the IPv6 header and IPv6 address representations.
Since we're using AWS #EC2, remember that we have instructions for how to set up a dual-stack VPC and subnet to launch your instances in:
Creating AWS IPv4/IPv6 Dual Stack EC2 Instances
A quick summary of the AWS EC2 resources needed to create an IPv6-enabled or dualstack instance.
(www.netmeister.org)
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System Administration: Week 5: Networking I: IPv6 Basics
In this video, we get familiar with our Big Hero IPv6, looking at the structure of the IPv6 header and IPv6 address representations.
Since we're using AWS #EC2, remember that we have instructions for how to set up a dual-stack VPC and subnet to launch your instances in:
Creating AWS IPv4/IPv6 Dual Stack EC2 Instances
A quick summary of the AWS EC2 resources needed to create an IPv6-enabled or dualstack instance.
(www.netmeister.org)
System Administration: Week 5: Networking I: IP Allocation & IPv4 Exhaustion
Mommy, where do IP addresses come from? In this video, we discuss how IANA allocates IP addresses to the Regional Internet Registries and try to illustrate just how large the #IPv6 address space is.
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System Administration: Week 5: Networking I: IP Allocation & IPv4 Exhaustion
Mommy, where do IP addresses come from? In this video, we discuss how IANA allocates IP addresses to the Regional Internet Registries and try to illustrate just how large the #IPv6 address space is.
System Administration: Week 5: Networking I:The Physical Internet
In this video, we look at the physical structure of the internet, with a focus on submarine internet communications cables. Jumping from the bottom of the OSI stack all the way to Layer 9 ("political"), we then discuss how different countries use their political power to enforce internet blocks on their citizens, leading us to warrantless wiretapping in AT&T's room 641A.
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System Administration: Week 5: Networking I:The Physical Internet
In this video, we look at the physical structure of the internet, with a focus on submarine internet communications cables. Jumping from the bottom of the OSI stack all the way to Layer 9 ("political"), we then discuss how different countries use their political power to enforce internet blocks on their citizens, leading us to warrantless wiretapping in AT&T's room 641A.
System Administration: Week 5: Networking I: A Network of Networks
In this video, we look at how independent networks connect to one another, how Autonomous Systems numbers allow us to identify network operators, and how peering between independent ASs works.
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System Administration: Week 5: Networking I: A Network of Networks
In this video, we look at how independent networks connect to one another, how Autonomous Systems numbers allow us to identify network operators, and how peering between independent ASs works.
System Administration: Week 6: Networking II: A Simple Request
In this video, we trace a simple HTTP request made via telnet to find out just how exactly our application knows how to connect to the remote server. In the process we learn about the ktrace(1) utility, as well as the nsswitch.conf(5), hosts(5), and resolv.conf(5) configuration files.
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System Administration: Week 6: Networking II: A Simple Request
In this video, we trace a simple HTTP request made via telnet to find out just how exactly our application knows how to connect to the remote server. In the process we learn about the ktrace(1) utility, as well as the nsswitch.conf(5), hosts(5), and resolv.conf(5) configuration files.
ooh. the first peek down the rabbit hole that is DNS resolution.
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ooh. the first peek down the rabbit hole that is DNS resolution.
@paul_ipv6 Yeah. Only on most Linux flavors these days that quickly goes sideways and straight into systemd. 🤮
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@paul_ipv6 Yeah. Only on most Linux flavors these days that quickly goes sideways and straight into systemd. 🤮
yup. hence my "rabbit hole" description.
DoT/DoH, systemd-resolved, OS level caches in M$/OSX, lying walled garden proxies.
it's much like chess. you can learn the basic rules in an afternoon but still not really master it in a lifetime.
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R relay@relay.infosec.exchange shared this topic
