In the world of computer networking, efficient bandwidth utilization is paramount, especially for small Tier 3 Internet Service Providers (ISPs) operating in regions like Africa. In this blog post, we\’ll explore some strategies for optimizing bandwidth usage in such environments, with a focus on the Research and Education Network for Uganda (RENU). Traffic Shaping and […]
Optimizing Bandwidth Usage in a Tier 3 ISP Read More »
In a network where Service Providers run customers’ VLAN traffic over their backbone network, there is a possibility of VLAN crushing if different customers use overlapping VLAN IDs. With Q-in-Q Tunneling Providers can segregate different customers’ VLAN traffic on a link (for example, if the customers use overlapping VLAN IDs) or bundle different customer VLANs
Q-in-Q Tunneling for ELS support on Juniper Switches Read More »
Virtual private LAN service (VPLS) multihoming enables you to connect a customer site to two or more PE routers to provide redundant connectivity. A redundant PE router can provide network service to the customer site as soon as a failure is detected. VPLS multihoming helps to maintain VPLS service and traffic forwarding to and from
VPLS Multihoming in a Sub-ring setup using rpm and event-handlers for Juniper Read More »
INTRODUCTION Cisco Nexus 3000 Series Switches are designed for data center top-of-rack deployments by providing 24 to 128 ports offering flexible connectivity, high performance, and a comprehensive feature set. It usually runs on multiple versions of OS images including 6.2a, 6.3a, 6.8, 7.3 and many others. Figure 1: Nexus 3000 series switch TFTP (Trivial FTP),
RECOVERING CISCO NEXUS 3000 SERIES SWITCH USING A TFTP SERVER Read More »
Ping Plotter This is a tool used by the RENU community to troubleshoot network issues. Once an institution is facing problems they are prompted to share their results with the NOC for interpretation. The big question is do you understand these graphs. This write-up covers the basic features of the graphs and their interpretation. You\’ve
Optical Bypass Switches A bypass switch (or bypass TAP) is a hardware device that provides a fail-safe access port for an in-line active network device such as an intrusion prevention system (IPS), next-generation firewall, network switch etc. if the device loses power, experiences a software failure, or is taken off-line for updates or upgrades, traffic can no longer flow
Optical ByPass Switching Read More »
Cacti is a free network graphing tool that is used to visualize the time series data obtained by the Round-Robin database tool (RDD tool). The tool polls network devices like switches and routers via SNMP and then graphs their data. Some of the data that are polled are CPU load, temperature, uptime and network bandwidth
Using cacti to monitor bandwidth consumption Read More »
Accessible RDP This report identifies hosts that have Remote Desktop (RDP) Service running and accessible to the world on the Internet. Misconfigured RDP can allow miscreants access to the desktop of a vulnerable host and can also allow for information gathering on a target host as the SSL certificate used by RDP often contains the
After OS upgrade on Junos MX5, you are hit with following notice upon reboot; — JUNOS 13.3R9.13 built 2016-03-01 07:16:35 UTC — NOTICE: System is running on alternate media device (/dev/da1s1a) This error is as a result of various scenarios and below are the possible causes: 1.) A software failure/error on the primary media (flash)
Traffic Analysis is a critical component in network planning, security and troubleshooting. For you to perform traffic analysis, you need to collect network traffic flows from the different aggregation points in your network such as routers and switches. In Juniper, they take advantage of \’sampling\’ packets and frames going through a switch or router. The
Traffic Flow Sampling in Juniper Mx-5 and Mx-480 Routers IPv4 and IPv6 Read More »
