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Using Local SPAN to Troubleshoot and Resolve Problems
A Switched Port Analyzer, or SPAN, is a way that you can monitor traffic. Back when networks used hubs, all traffic was visible because a hub just repeated the traffic out every port except the one it came in on. When switches were introduced, SPAN functionality was introduced to accommodate. It is common to set…
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ICMP Echo-Based IP SLA
Internet Control Message Protocol (ICMP) is a commonly used utility to test Layer 3 connectivity between devices. A Service Level Agreement (SLA) is a target that must be met; there is no set criteria for an SLA. ICMP echo-based IP SLA is a way to monitor end-to-end response time between Cisco devices using IPv4 or…
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Connecting to IPv6 Websites by IP
Internet Protocol version 6 (IPv6) request for comments (RFC) 1883 (https://tools.ietf.org/html/rfc1883) came out in December 1995. That’s 22 years ago! So how do you connect to an IPv6 address without using a Domain Name Server (DNS)? It’s only slightly different than Internet Protocol version 4 (IPv4). You do need to make sure you have an…