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Table of Contents
- play_arrow Login Classes and Login Settings
- play_arrow User Accounts
- play_arrow Passwords for User Access
- play_arrow Trusted Platform Module
- play_arrow User Authentication
- play_arrow Remote Access Management
- play_arrow Access Control
- Access Control Authentication Methods
- Preventing Unauthorized Access to EX Series Switches Using Unattended Mode for U-Boot
- Preventing Unauthorized Access to EX Series Switches Using Unattended Mode for U-Boot
- RADIUS Server Configuration for Authentication
- RADIUS over TLS (RADSEC)
- 802.1X Authentication
- MAC RADIUS Authentication
- Service-Type Attribute and Jumbo Frame Handling Overview
- 802.1X and RADIUS Accounting
- Example: Setting Up 802.1X for Single-Supplicant or Multiple-Supplicant Configurations on an EX Series Switch
- Example: Setting Up 802.1X in Conference Rooms to Provide Internet Access to Corporate Visitors on an EX Series Switch
- Interfaces Enabled for 802.1X or MAC RADIUS Authentication
- Static MAC Bypass of 802.1X and MAC RADIUS Authentication
- Configuring PEAP for MAC RADIUS Authentication
- Captive Portal Authentication
- Flexible Authentication Order on EX Series Switches
- Server Fail Fallback and Authentication
- Authentication Session Timeout
- Central Web Authentication
- Dynamic VLAN Assignment for Colorless Ports
- VoIP on EX Series Switches
- play_arrow Configuring IEEE 802.1x Port-Based Network Access Control
- play_arrow Configuring IEEE 802.1x Port-Based Network Access Control in Enhanced LAN Mode
- 802.1X for MX Series Routers in Enhanced LAN Mode Overview
- Understanding 802.1X and LLDP and LLDP-MED on MX Series Routers in Enhanced LAN Mode
- Understanding 802.1X and RADIUS Accounting on MX Series Routers in Enhanced LAN Mode
- Understanding 802.1X and VoIP on MX Series Routers in Enhanced LAN Mode
- Understanding Guest VLANs for 802.1X on MX Series Routers in Enhanced LAN Mode
- Understanding Dynamic VLANs for 802.1X on MX Series Routers in Enhanced LAN Mode
- Understanding Server Fail Fallback and Authentication on MX Series Routers in Enhanced LAN Mode
- Configuring 802.1X RADIUS Accounting on MX Series Routers in Enhanced LAN Mode
- Configuring 802.1X Interface Settings on MX Series Routers in Enhanced LAN Mode
- Configuring LLDP-MED on MX Series Routers in Enhanced LAN Mode
- Configuring LLDP on MX Series Routers in Enhanced LAN Mode
- Configuring Server Fail Fallback on MX Series Routers in Enhanced LAN Mode
- Understanding Captive Portal Authentication on the MX Series Routers
- Understanding Authentication Session Timeout on MX Series Routers
- Authentication Process Flow for MX Series Routers in Enhanced LAN Mode
- Specifying RADIUS Server Connections on an MX Series Router in Enhanced LAN Mode
- Configuring Captive Portal Authentication on MX Series Routers in Enhanced LAN Mode
- Designing a Captive Portal Authentication Login Page on an MX Series Router
- Configuring Static MAC Bypass of Authentication on MX Series Routers in Enhanced LAN Mode
- Controlling Authentication Session Timeouts on an MX Series Router in Enhanced LAN Mode
- Configuring MAC RADIUS Authentication on MX Series Routers in Enhanced LAN Mode
- Example: Configuring MAC RADIUS Authentication on an MX Series Router
- Example: Setting Up Captive Portal Authentication on an MX Series Router
- Example: Connecting a RADIUS Server for 802.1X to an MX Series Router
- Example: Setting Up 802.1X in Conference Rooms to Provide Internet Access to Corporate Visitors on an MX Series Router
- Example: Configuring Static MAC Bypass of Authentication on an MX Series Router
- Example: Applying Firewall Filters to Multiple Supplicants on Interfaces Enabled for 802.1X or MAC RADIUS Authentication on MX Series Routers
- play_arrow Device Discovery
- play_arrow Permission Flags
- access
- access-control
- admin
- admin-control
- all
- clear
- configure
- control
- field
- firewall
- firewall-control
- floppy
- flow-tap
- flow-tap-control
- flow-tap-operation
- idp-profiler-operation
- interface
- interface-control
- maintenance
- network
- pgcp-session-mirroring
- pgcp-session-mirroring-control
- reset
- rollback
- routing
- routing-control
- secret
- secret-control
- security
- security-control
- shell
- snmp
- snmp-control
- system
- system-control
- trace
- trace-control
- view
- view-configuration
- play_arrow Configuration Statements and Operational Commands
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Configuring the TTL Value for DNS Server Caching
date_range
09-Nov-21
This section describes how to configure the TTL value for a DNS server cache to define the period for which DNS query results are cached.
Requirements
No special configuration beyond device initialization is required before performing this task.
Overview
The DNS name server stores DNS query responses in its cache for the TTL period specified in the TTL field of the resource record. When the TTL value expires, the name server sends a fresh DNS query and updates the cache. You can configure the TTL value from 0 to 604,800 seconds. You can also configure the TTL value for cached negative responses. Negative caching is the storing of the record that a value does not exist. In this example, you set the maximum TTL value for cached (and negative cached) responses to 86,400 seconds.
Topology
Configuration
Procedure
Step-by-Step Procedure
To configure the TTL value for a DNS server cache:
Specify the maximum TTL value for cached responses, in seconds. (In this example, 86400 seconds equals 24 hours.)
content_copy zoom_out_map[edit] user@host# set system services dns max-cache-ttl 86400
Specify the maximum TTL value for negative cached responses, in seconds.
content_copy zoom_out_map[edit] user@host# set system services dns max-ncache-ttl 86400
If you are done configuring the device, commit the configuration.
content_copy zoom_out_map[edit] user@host# commit
