![Ticket#10 - NAT Overload Failure: Why Users Couldn't Access the Internet – A Real Fix [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-10.jpg)
Problem Summary In a mid-sized enterprise, users across VLANs suddenly reported that they couldn’t browse the internet or access external services. While internal services like file sharing and internal DNS were operational, anything beyond the firewall was unreachable. Symptoms Observed Root Cause Analysis Initial checks […]
![Ticket#9 - WAN Flap Detection: DMVPN Phase 2 Tunnel Up/Down Issue Fixed [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-9.jpg)
Problem Summary The enterprise monitoring tool detected flapping tunnels between remote branch routers and the HQ hub.Ticket Priority: HighIssue: DMVPN Phase 2 Tunnel intermittently goes UP/DOWN, causing loss of reachability to HQ and apps like VoIP. Symptoms Observed Symptom Description Tunnel state flapping Tunnel interface […]
![Ticket#8 - VOIP Choppy Audio – DSCP Marking Mismatch Fixed [QoS Real World] [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-8.jpg)
Problem Summary Users across multiple floors reported choppy VoIP audio during internal calls. The problem was intermittent but noticeable during peak hours. Symptoms Observed Root Cause Analysis Upon initial inspection, end-to-end ping and traceroute were normal. However, show policy-map interface revealed DSCP marking inconsistencies between […]
![Ticket#7 - Multicast Video Freezes in Conference Room – Troubleshoot IGMP and PIM [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-7.jpg)
Problem Summary In a conference room, video multicast stream intermittently freezes or buffers during a live broadcast. The network uses multicast for IPTV using: Symptoms Observed Symptom Observed Impact Video Freezing Occurs every 2–3 mins IGMP joins seen But not always registered at the router […]
![Ticket#6 - DHCP Not Working on Access Layer – Troubleshoot Snooping and Relay [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-6.jpg)
Problem Summary In a mid-sized enterprise campus network, multiple users reported they were unable to get IP addresses from the DHCP server. The issue was isolated to specific access switches connected to VLAN 30. The DHCP server was reachable via Layer 3 on a core […]
![[DAY#6 PyATS Series] Using pyATS CLI tools: pyats learn, pyats parse using PyATS [Python for Network Engineer]](https://networkjourney.com/wp-content/uploads/2025/07/DAY6-PyATS-Series-Using-pyATS-CLI-tools-pyats-learn-pyats-parse-using-PyATS-Python-for-Network-Engineer.png)
Introduction: Your First Step into CLI Magic with pyATS Today’s blog is all about unlocking the CLI power of pyATS, specifically: These tools are a goldmine for Python for Network Engineer workflows, especially when working across vendors like Cisco, Arista, Palo Alto, and FortiGate. By […]
![[DAY#5 PyATS Series] Connecting to Cisco/Arista/Paloalto/Fortigate devices (SSH) Using pyATS [Python for Network Engineers]](https://networkjourney.com/wp-content/uploads/2025/07/DAY5-PyATS-Series-Connecting-to-Cisco_Arista_Paloalto_Fortigate-devices-SSH-Using-pyATS-Python-for-Network-Engineers.png)
Introduction: A Real-World Take on Network Automation Have you ever been in a situation where you had to pull device inventory, verify version info, or just log into 15+ devices from different vendors like Cisco, Arista, FortiGate, or Palo Alto? It’s not fun doing that […]
Introduction on the Key Points In Day 4 of our 101 Days of pyATS series, we’ll explore how to create your first testbed.yaml file. This file serves as the backbone for your automation scripts. Whether you are working with Cisco IOS, NX-OS, IOS-XR, or even […]
![Ticket#5 - OSPF Neighbor Stuck in INIT/2WAY – How to Diagnose and Resolve [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-5.jpg)
Problem Summary An enterprise network reported intermittent OSPF adjacency issues between two routers in Area 0. Routing updates were not exchanged, leading to blackholing of traffic to remote branches. After multiple resets, the OSPF neighbor relationship remained stuck in INIT or 2WAY states. Ping between […]
![Ticket#4 - BGP Route Not Installing in RIB – Path Attributes and Fix [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-4.jpg)
Problem Summary A network engineer noticed that a BGP route was visible in the BGP table (show ip bgp) but not getting installed in the routing table (RIB) on a core router connected to multiple ISPs. Traffic toward the advertised prefix was getting dropped. Despite […]
