- Network Automation (19)
- Network Services (8)
- SDN (10)
recent posts
- NAT
- Proxy ARP
- DNS and HTTP GET with IP SLA
- Cisco IRB (Integrated Routing and Bridging)
- GLBP Weighting
- DNS Server on Cisco IOS
- DHCP Proxy over PPP
- ARP authorized
- QoS in Cisco SD-WAN
- Application-based traffic steering And AAR
- Creating Extranets and Access to Shared Services
- Enforcing Security Perimeters with Service Insertion
- Cisco SD-WAN TLOC Extension
- Cisco SD-WAN Security Features
- Traffic Engineering at Sites with Multiple Routers
- Isolating Guest Users from the Corporate VPN
- Cisco SD-WAN Hub-and-Spoke Topology
- Cisco SD-WAN Onboarding
- AI-Powered Network Assistant
- Ansible Playbook
- Ansible Gathering Facts
- AI-Powered Interface Health Checker with pyATS and OpenAI
- pyATS
- Nornir
- Scrapli
- Netmiko
- Network Services Orchestrator
- Backup Router configuration with REST API
- Network Device Automation with Jinja2 Template
- NX-API
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Normally, when we think about DNS, we think about dedicated DNS servers. But Cisco IOS routers can also provide useful DNS features. In this scenario, I built a small lab to test how a router can act as: The lab contains two DNS servers and two clients. One of the clients also works as a…
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In this lab, I wanted to analyze a very specific use case: How can a router connected over a PPP serial link receive its IP address dynamically from a DHCP server that is not directly attached? What makes this lab interesting is that the DHCP client is connected through a PPP serial interface, not through…
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In this lab, I wanted to analyze the behavior of the Cisco IOS interface command arp authorized. The idea behind this feature is that the router should not rely on normal dynamic ARP learning on that interface. Cisco documents this behavior by stating that arp authorized stops dynamic ARP on the interface. Because of that,…
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Quality of Service (QoS) is a fundamental requirement in enterprise networks, especially when different types of traffic—such as voice, video, and bulk data—share the same WAN links. Cisco SD-WAN provides a structured QoS model that allows traffic to be: In this post, I’ll explain how QoS works in Cisco SD-WAN, how it differs from traditional…
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Application-based traffic steering using Centralized Data Policy Before introducing dynamic path selection with Application-Aware Routing (AAR), Cisco SD-WAN already provides the ability to control traffic behavior based on application type. This is known as Application Traffic Engineering, where traffic is classified using Deep Packet Inspection (DPI), and forwarding decisions are made based on predefined policies.…
