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LOG

SNMPv3 Configuration on Cisco IOS and Junos: authPriv Setup

SNMPv3 Configuration on Cisco IOS and Junos: authPriv Setup

Configure SNMPv3 authPriv on Cisco IOS and Juniper Junos: security levels, USM users, views, VACM access, engine IDs and snmpwalk verification command

admin admin 2026-09-06
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Junos Firewall Filters: Terms, Match Conditions and Actions

Junos Firewall Filters: Terms, Match Conditions and Actions

Junos firewall filter configuration: terms, from match conditions and then actions, loopback filters, counters, the implicit discard and verification.

admin admin 2026-09-06
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WireGuard Site-to-Site VPN: wg0.conf Configuration Example

WireGuard Site-to-Site VPN: wg0.conf Configuration Example

Build a WireGuard site-to-site VPN between two Linux gateways: key generation, wg0.conf [Interface]/[Peer] sections, AllowedIPs routing, MTU and keepa

admin admin 2026-09-06
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nginx Reverse Proxy Setup: proxy_pass, Headers and Buffers

nginx Reverse Proxy Setup: proxy_pass, Headers and Buffers

Configure nginx as a reverse proxy with proxy_pass: location matching rules, header propagation, buffer tuning and upstream logging, with working conf

admin admin 2026-09-06
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tcpdump Command Examples: Filters and Practical Packet Capture

tcpdump Command Examples: Filters and Practical Packet Capture

Practical tcpdump command examples: interface selection, BPF host/port/protocol filters, pcap capture files, output reading and troubleshooting recipe

admin admin 2026-09-06
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Open vSwitch Basics: Bridges, Access Ports and VLANs

Open vSwitch Basics: Bridges, Access Ports and VLANs

Configure Open vSwitch with ovs-vsctl: bridges, access and trunk ports, tags, internal ports, LACP bonds, tunnels, QoS, mirroring and verification com

admin admin 2026-09-05
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Keepalived VRRP for HAProxy: Virtual IP Failover Setup

Keepalived VRRP for HAProxy: Virtual IP Failover Setup

Build HAProxy high availability with keepalived VRRP: virtual IP failover, health checks, sysctl tuning, unicast VRRP, notify scripts and failover tes

admin admin 2026-09-05
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Cisco Prefix-List and Route-Map Filtering for BGP

Cisco Prefix-List and Route-Map Filtering for BGP

Filter BGP routes with Cisco prefix-lists and route-maps: ge/le prefix matching, sequence logic, bogon filters and safe deny/permit patterns.

admin admin 2026-09-05
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RSTP vs MSTP: Convergence, Instances and Migration

RSTP vs MSTP: Convergence, Instances and Migration

Compare RSTP and MSTP: convergence, port roles, MST regions and instances, with Cisco configuration, verification and a phased migration plan.

admin admin 2026-09-05
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SSH Tunneling: Local, Remote and Dynamic Port Forwarding

SSH Tunneling: Local, Remote and Dynamic Port Forwarding

SSH tunnel guide: local -L, remote -R and dynamic SOCKS -D port forwarding, ssh_config aliases, GatewayPorts, autossh, security and troubleshooting.

admin admin 2026-09-05
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