Author: Chris
IPv6 addressing install guide for windows XP and Vista
Tweet For the windows systems, no IPv6 software installation is necessary, but IPv6 stack should be enable to use IPv6 addressing. The procedure is quite…
Security Warning – Exposed WAN Link Identity by reverse lookup
If someone knows what is your IP address of WAN link, if someone knows what ISP you are currently using, if someone knows where your…
VPCS error with “206-unable to create UDP NIO”
Tweet VPCS(Virtual PC Simulator) is a PC simulating software which is small and easy to use. For the Dynamips user, this simulator is fairly handy….
Ethernet speed and duplex configuration
Tweet Speed mismatching issues may result in no connectivity. However, issues withauto-negotiation of duplex generally do not result in link establishment issues. Instead, auto-negotiation issues…
What is SYS-ID-EXT parameter in Spanning-tree?
Tweet The bridge ID priority is combined with the system ID extension to create the bridge ID priority for the VLAN. Bridge ID Priotirty =…
Verifying Cisco router traffic load-sharing by CEF
Tweet Cisco Express Forwarding (CEF) is well-known Cisco advanced Layer 3 IP switching technology. This technology brings traffic load-sharing technique that is functionality in a…
Monitoring your website by Google Alerts
Tweet If you see incoming traffic is certainly dropped, you need to review whether the site got hacked or not. If you are not savvy…
What is UDLD protocol ?
Tweet In order to detect the unidirectional links before the forwarding loop is created, Cisco designed and implemented the UDLD protocol. UDLD is a Layer…
How to calculate full mesh WAN links
There are three different type of network topologies. 1. Hub-and-spoke 2. Full mesh 3. Hybrid How to calculate WAN links? Here is how…
Link State Routing Protocols Drawback
Tweet Link State routing protocols, such as OSPF and IS-IS, converge more quickly than their distance vector routing protocols such as RIPv1, RIPv2, EIGRP and…
What Route Reflectors does ?
Tweet Within any BGP autonomous system, every IBGP speaker must have a fully meshed peering arrangement with every other iBGP speaker. This is due to…
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