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DNS
● Name resolution
○ Use hostname instead of IP address for operations
● 2 ways for DNS setting
○ On-device name resolution
■ Do not use DNS servers
○ Off-device name resolution
■ Use DNS servers
On-device Name Resolution
● Device resolves name by itself
○ Do not use DNS servers
● Command
○ set system static-host-mapping
■ Statically map hostname with IP address
■ Can also set alias name for hostname
Off-device Name Resolution
● Use DNS servers
● Command
○ set system name-server ipaddress
IP address for Lab
● google.com IP address
○ 172.217.18.206
● google public DNS IP address
○ 8.8.8.8

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Mastering JUNOS DNS

  • 1. DNS ● Name resolution ○ Use hostname instead of IP address for operations ● 2 ways for DNS setting ○ On-device name resolution ■ Do not use DNS servers ○ Off-device name resolution ■ Use DNS servers
  • 2. On-device Name Resolution ● Device resolves name by itself ○ Do not use DNS servers ● Command ○ set system static-host-mapping ■ Statically map hostname with IP address ■ Can also set alias name for hostname
  • 3. Off-device Name Resolution ● Use DNS servers ● Command ○ set system name-server ipaddress
  • 4. IP address for Lab ● google.com IP address ○ 172.217.18.206 ● google public DNS IP address ○ 8.8.8.8