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标签：Network Security

ArubaOS-CX TACACS+ Command Authorization

ArubaOS-CX TACACS+ Command Authorization

Configure ArubaOS-CX TACACS+ AAA with command authorization, fail-through ordering and local fallback so a dead server cannot lock you out.

admin admin 2026-10-14
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Cisco ASA packet-tracer: Troubleshooting Access Problems

Cisco ASA packet-tracer: Troubleshooting Access Problems

Read Cisco ASA packet-tracer output phase by phase to prove whether an ACL, NAT rule, route or adjacency is dropping traffic, with real drop reasons.

admin admin 2026-10-12
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Sudoers Best Practices: Delegating Root Safely

Sudoers Best Practices: Delegating Root Safely

Write and validate sudoers rules with visudo and /etc/sudoers.d, scope privileges by command and host, and avoid the NOPASSWD traps.

admin admin 2026-10-12
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DHCP Option 82: Relay Agent Circuit ID and Remote ID

DHCP Option 82: Relay Agent Circuit ID and Remote ID

How DHCP Option 82 works per RFC 3046: the circuit-id and remote-id sub-options, insertion and stripping rules, and vendor configuration patterns.

admin admin 2026-10-08
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Dell OS10 802.1X Port Authentication Configuration

Dell OS10 802.1X Port Authentication Configuration

Enable 802.1X on Dell SmartFabric OS10: global dot1x system-auth-control, RADIUS server setup, per-port control and verification with show dot1x.

admin admin 2026-10-08
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Dell OS10 DHCP Relay and Snooping Configuration

Dell OS10 DHCP Relay and Snooping Configuration

Configure DHCP relay with ip helper-address and DHCP snooping on Dell SmartFabric OS10, including trust ports, VLAN scope and the binding table.

admin admin 2026-10-08
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Junos DHCP Snooping and IP Source Guard on EX

Junos DHCP Snooping and IP Source Guard on EX

Configure DHCP snooping, IP source guard and dynamic ARP inspection on Juniper EX switches: trusted interfaces, the binding table, and verification pe

admin admin 2026-10-07
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TACACS+ AAA Accounting and Command Authorization

TACACS+ AAA Accounting and Command Authorization

Configure Cisco TACACS+ command authorization and accounting: privilege-level command sets, the config-commands trade-off, start-stop records and veri

admin admin 2026-10-07
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Pi-hole vs AdGuard Home: Choosing a DNS Filter in 2026

Pi-hole vs AdGuard Home: Choosing a DNS Filter in 2026

Pi-hole v6 vs AdGuard Home compared: encrypted DNS, per-client rules, parental controls, DHCP and the redundancy mistake everyone makes.

admin admin 2026-10-04
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Arista EOS DHCP Snooping and IP Source Guard

Arista EOS DHCP Snooping and IP Source Guard

Configure DHCP snooping and IP source guard on Arista EOS: trusted uplinks, binding table verification and blocking rogue DHCP servers and IP spoofing

admin admin 2026-09-29
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