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The most I can offer is an incomplete solution (a set of questions) which may help troubleshoot, or at least guide you in the direction of a more complete solution.
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Hello <br />
<br />
I'm having a strange issue with my HP MSM720 wireless controller. my users will be working over the wireless and suddenly will lose DNS or the internet will become very slow. this is driving me crazy. I've upgraded the firmware on controller and APs. <br />
<br />
please help
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Hello 

I'm having a strange issue with my HP MSM720 wireless controller. my users will be working over the wireless and suddenly will lose DNS or the internet will become very slow. this is driving me crazy. I've upgraded the firmware on controller and APs. 

please help

DNS seems to drop from msm720 controller

Network Management involves issues that are independent of specific hardware or software, including email policies, upgrade planning, backup scheduling and working with managed service providers for Desktop-As-A-Service (DaaS), Software-As-A-Service (SaaS) and the like through the use of tools, coupled with manufacturer standards, best practice guidelines, policies and procedures plus all other relevant documentation. Network management also includes monitoring, alerting and reporting, management reporting, planning for device or service updates, the backup of configurations, the setting of key performance indicators and measures (KPIs/KPMs), associated service level agreements and problem records as part of the IT Service Management (ITSM) framework.

Network Management

Network Operations includes asset management, help-desk supervision, security and user policies, infrastructure administration and anything else that affects the operation of your network. Discussions will include those of best practices in platforms, configurations, performance, security and accounting.

Network Operations

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.