Category Archives: Case Study

Network Troubleshooting Methods

Troubleshooting a network connectivity issue is quite challenging in a complex Data Center Network with live production traffic. Below are few basic methods to identify a node in the traffic path that drops packets which would cause network connectivity issues. This procedure … Continue reading

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Issue#2: Packets were not seen at the egress interface in a snake test

Issue: Snake test is usually performed to check whether a device can handle traffic Tx/Rx to/from all active interfaces at line-rate. The snake test is usually performed as below; Traffic SENDER—- 0/1(Router)0/2 —- 0/3(same router)0/4—-0/5(same router)0/6— Traffic RECEIVER ports 0/1-2 … Continue reading

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Issue#1: Firewall not receiving packets from a router

Issue: When a router receives a packet, it would check the routing table to forward the packet to the egress(outgoing) interface based on the destination IP address. If we need to forward packet based on other field, like source IP … Continue reading

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