LOG 归档 - 第62页共139页

DWDM 50GHz vs 100GHz Channel Spacing on the ITU Grid

ITU-T G.694.1 fixed and flexible DWDM grids: wavelength maths, 50GHz vs 100GHz trade-offs, filtering and OSNR cost, migration and a validation checkli

admin 2026-09-14

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Spanning Tree Root Bridge Election and Design Rules

Bridge ID, path cost and the extended system ID decide your STP root. Configure root primary and secondary, add MST and guard features, then verify it

admin 2026-09-14

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BGP Best External and Add-Path: Advertise More Paths

How BGP best external and add-path (RFC 7911) stop suboptimal routing: IOS-XE bgp additional-paths commands, Junos add-path send/receive, and verifica

admin 2026-09-14

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systemd-resolved and resolvectl: DNS Troubleshooting

Fix DNS on systemd hosts: the stub on 127.0.0.53, resolvectl status, query and per-link route-only domains, DNSSEC pitfalls and why resolv.conf keeps

admin 2026-09-14

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NVMe over TCP: Target and Initiator Setup Guide

Set up NVMe over TCP end to end: nvmet kernel target via nvmetcli, host NQN access control, nvme-cli discovery and connect, multipath failover and jum

admin 2026-09-14

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WireGuard MTU and Handshake Failures: Fix Guide

Diagnose WireGuard tunnels that ping but stall: path MTU maths, PersistentKeepalive for NAT, AllowedIPs mistakes, forwarding, MASQUERADE and verificat

admin 2026-09-14

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NGINX stream Module: TCP and UDP Load Balancing

NGINX stream module: proxy and load balance TCP and UDP. Build listeners, upstreams, balancing methods, timeouts, TLS passthrough, logs and health che

admin 2026-09-14

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MetalLB Layer2 vs BGP: Address Pool Setup

MetalLB on bare metal: compare Layer2 leader election with BGP service-IP advertisement, then build IPAddressPool, L2Advertisement and BGPPeer objects

admin 2026-09-14

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Ceph CRUSH Map: Device Classes and Custom Rules

Use Ceph device classes (ssd, hdd, nvme) and CRUSH rules to land each pool on the right hardware, plus EC profiles, the upmap balancer and verificatio

admin 2026-09-14

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ZFS Send and Receive: Snapshot Replication Guide

Replicate ZFS datasets end to end: recursive snapshots, incremental zfs send -R over SSH, raw sends for encrypted data, mbuffer tuning and stream veri

admin 2026-09-14

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