LOG 归档 - 第2页共134页

nftables Stateful Firewall with Connection Tracking

Build a stateful nftables firewall using ct state: allow established and related traffic, drop invalid packets, and open specific ports per chain.

admin 2026-10-08

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Cisco IP SLA Tracking for Floating Static Route Failover

Build ISP failover with Cisco IP SLA: icmp-echo probes, track objects, floating static routes with distance and NAT failover using route-maps.

admin 2026-10-08

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Jumbo Frames MTU Mismatch: Diagnosing Silent Drops

Diagnose jumbo frame failures: find the device with the low MTU using DF-bit pings, fix it, and understand why large pings fail only to some hosts.

admin 2026-10-08

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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 2026-10-08

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Nokia SR Linux EVPN-VXLAN: Interface and Tunnel Setup

Build an EVPN-VXLAN fabric on Nokia SR Linux: MAC-VRF, IRB subinterface, vxlan-interface binding and BGP EVPN with real config examples.

admin 2026-10-08

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Extreme EXOS VRRP: VRID Configuration and Failover

Configure VRRP on Extreme EXOS: create the virtual router per VLAN, add the VIP, tune priority and preemption, and verify with show vrrp.

admin 2026-10-08

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华为交换机 PoE 供电配置与功率管理实战

详解华为交换机 PoE 配置：poe enable、poe power 限制接口最大输出功率、poe priority 供电优先级，以及 display poe power-state 验证方法。，并附完整命令、验证方法与常见故障的排查步骤说明。

admin 2026-10-08

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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 2026-10-08

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Juniper SRX AppSecure: AppID and UTM Policy Setup

Configure AppSecure on Juniper SRX: application identification, AppTrack visibility and unified policies that apply UTM profiles for AV and web filter

admin 2026-10-08

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EVPN ESI Multihoming: All-Active vs Single-Active

How EVPN multihoming uses Ethernet Segment Identifiers: route type 4 DF election, ESI labels for split-horizon and the all-active vs single-active tra

admin 2026-10-08

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