Webinar topic: Up and Running DNS Service Presenter: Achmad Mardiansyah In this webinar series, Up and Running DNS Service Please share your feedback or webinar ideas here: http://bit.ly/glcfeedback Check our schedule for future events: https://www.glcnetworks.com/en/schedule/ Follow our social media for updates: Facebook, Instagram, YouTube Channel, and telegram also discord Recording available on Youtube https://youtu.be/V7Soqp_Rs7w

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UP and Running
DNS service
GLC Webinar,
04 nov 2021
Achmad Mardiansyah
achmad@glcnetworks.com
GLC Networks, Indonesia
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Source: geekforgeeks

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Agenda
● Introduction
● Review prerequisite knowledge
● DNS system
● DNS configuration
● Live practice
● Q & A
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introduction
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What is GLC?
● Garda Lintas Cakrawala (www.glcnetworks.com)
● Based in Bandung, Indonesia
● Areas: Training, IT Consulting
● Certified partner for: Mikrotik, Ubiquity, Linux foundation
● Product: GLC radius manager
● Regular event
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Trainer Introduction
● Name: Achmad Mardiansyah
● Base: bandung, Indonesia
● Linux user since 1999, mikrotik user since 2007, UBNT
2011
● Mikrotik Certified Trainer
(MTCNA/RE/WE/UME/INE/TCE/IPv6)
● Mikrotik/Linux Certified Consultant
● Website contributor: achmadjournal.com, mikrotik.tips,
asysadmin.tips
● More info:
http://au.linkedin.com/in/achmadmardiansyah
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Past experience
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● 2021 (Congo DRC, Malaysia): network support,
radius/billing integration
● 2020 (Congo DRC, Malaysia): IOT integration,
network automation
● 2019, Congo (DRC): build a wireless ISP from
ground-up
● 2018, Malaysia: network revamp, develop billing
solution and integration, setup dynamic routing
● 2017, Libya (north africa): remote wireless migration
for a new Wireless ISP
● 2016, United Kingdom: workshop for wireless ISP,
migrating a bridged to routed network

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About GLC webinar?
● First webinar: january 1, 2010 (title:
tahun baru bersama solaris - new year
with solaris OS)
● As a sharing event with various topics:
linux, networking, wireless, database,
programming, etc
● Regular schedule
● Irregular schedule: as needed
● Checking schedule:
http://www.glcnetworks.com/schedule
● You are invited to be a presenter
○ No need to be an expert
○ This is a forum for sharing: knowledge,
experiences, information
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Please introduce yourself
● Your name
● Your company/university?
● Your networking experience?
● Your mikrotik experience?
● Your expectation from this course?
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Prerequisite
● This presentation some prerequisite knowledge
● We assume you already understand:
○ How browsing works
○ Computer networks
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Review prerequisite knowledge
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A bit of history...
● Initially, research project (’70-’80s) – Open, cooperative, public domain
○ “Rough consensus and running code”
● Then, product of liberalisation (’90s) – Also, catalyst for deregulation
○ Commercial, competitive environment
● Now, public utility and critical infrastructure (since 2000 and beyond)
○ “Internet governance” is a recent afterthought
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Source: APNIC

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Before internet...
● Computer networking already exist… but many are proprietary
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Source: APNIC

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Internet defines a standard for communication
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Source: APNIC

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After internet...
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Why use internet
● Open
○ Free standards and implementations – Low barrier to entry
● Lightweight
○ “Dumb”: simple and efficient
○ Intelligence at the edges: in applications and devices
● Global
○ Uniform, “End-to-End”
● Neutral
○ By default
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Source: APNIC

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Layers in telecommunincations
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Source: APNIC

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Layers in traditional communication
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Source: APNIC

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Layers in internet communication
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Source: APNIC

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Inter-connected networks
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Source: APNIC

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Your ISP and you
● ISP is an organisation that is part of internet that provides connectivity to their
customers
○ Identified by their AS (Autonomous System) number
○ Identified by their IP address block
● When you connect to internet, you will use your ISP’s address
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Your ISP. and you
are part of them
other
ISP
other
ISP
google
facebook

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At your ISP (physical topology)
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Border
router
Other
ISP
Other
ISP
Access
router
Access
router
customer customer customer
Access network: FTTH, WLAN, FO,
GSM, ethernet, etc

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We need standards
● Standards operate at different levels of the network “stack”
○ in fact they define the stack
● A standard (or protocol) is simply an agreement
○ among members of a community,
○ on a set of guidelines or rules,
○ which allow cooperation (interoperability),
○ sometimes, in a forum such as ISO, ITU, W3C or IETF.
● An open standard is a standard which is
○ Developed through open and accessible processes
○ Freely accessible, implementable and usable
○ Available without barriers such as licenses and fees.
○ ... “ideally”, at least.
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Source: APNIC

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Addressing, IANA, RIR
● Internet is based on IP (internet protocol) addressing scheme -> RFC791
● Addressing has to be unique.
● We need an international body that regulates IP addressing -> IANA (Internet
Assigned Number Authority)
● IANA delegates (some of its authority) to RIR “Regional Internet Registry”
● RIR delegates to country’s
● Every organisation must have IP address block to join the internet and
build a routing scheme among their equipment
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Domain Name System (DNS)
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Before DNS
● Using /etc/hosts file for mapping → per client
○ A.B.C.D computer_name
● Use HOSTS.TXT file
● 1983 → RFC884
● 1984 → first DNS server (BIND), UNIX based
● 1987 → RFC 1034, 1035
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How DNS works
● DNS maps domain name to IP address
● Very important for domain based
services: HTTP (websites), voice call,
video, you name it, etc
● Steps
○ Host will contact DNS server, asking for a
domain
○ DNS server will reply the domain with IP
address
○ Host will access the target using given IP
address
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How DNS is managed
● Managed by IANA
● Delegated to internet registry
● You buy a domain via registry
● Pointing your domain to an DNS server
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DNS system
● Authoritative server
● Name server
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Address resolution mechanism
● Caching server
● Name server
● Rreverse DNS
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DNS protocol
● UDP port 53 → common protocol
● DNS over TCP → zone transfer
● DNS crypt
● DNS over TLS
● DNS over HTTPS (DoH)
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LIVE practice
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preparation
● SSH client
● SSH parameters
○ SSH address
○ SSH port
○ SSH username
○ SSH password
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Q & A
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Interested? Just come to our training...
● Topics are arranged in systematic and logical way
● You will learn from experienced teacher
● Not only learn the materials, but also sharing experiences, best-practices, and
networking
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End of slides
● Thank you for your attention
● Please submit your feedback: http://bit.ly/glcfeedback
● Find our further event on our website : https://www.glcnetworks.com/en/
● Like our facebook page: https://www.facebook.com/glcnetworks
● Slide: https://www.slideshare.net/glcnetworks/
● Discord (bahasa indonesia): (https://discord.gg/6MZ3KUHHBX)
● Recording (youtube): https://www.youtube.com/c/GLCNetworks
● Stay tune with our schedule
● Any questions?
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