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Issue: Hardware single points of failure
Solution: Try to minimize single points of failure. When they're unavoidable, make sure broken hardware can be replaced quickly.
If it's impossible to connect servers to multiple switches, be able to replace a broken switch with another one that has an identical configuration. So either use those switches in their default port/VLAN configuration, or set up a spare switch with an appropriate basic configuration in advance so simply replacing the hardware is enough to restore connectivity.
Issue: Routing protocol problems
Sometimes, for some reason, the packets are lost, but the BGP doesn't notice that there's a problem, so traffic is flowing towards the black hole rather than be rerouted.
Solution: One way to detect this problem is to monitor reachability of key remote services. Another is looking at total traffic, which will be much lower than usual in the presence of a black hole. Once detected, recovering from routing black hole affecting one ISP is very simple: shut down the BGP session towards that ISP until they've fixed the problem.
Issue: Routing problems caused by software bugs
Solution: It is useful to have equipment from different vendors, so that if one device is affected by a bug, the other one isn't.
Issue: Power supply problems
Solution: Having some kind of backup power is key. Also all network components must have redundant power supplies connected to different circuits, so they can keep running when there's a failure or maintenance on one feed. Make sure one circuit can provide adequate power by itself, and that the circuits have as few components in common as possible. If it is not possible to ensure redundant power supply, it's important to have two components that provide backup for each other connected to different power circuits, so if one circuit goes down, that doesn't take out both devices.
Error 442 - Failed to enable virtual adapter. No fix yet from Cisco. Try this work around. Run cmd as Administrator and execute the following command: reg add HKLM\System\CurrentControlSet\Services\Tcpip\Parameters /v ArpRetryCount /t REG_DWORD /d 0 /f
routers have a way to be reset when this happens. It is usually done by pressing a button on it for a few seconds. This kind of button usually needs to be pressed by a pen tip or unfolded paper clip.
Once the reset process is completed, your router will either have no password assign for th default administrator account or have it reset to a default which is mentioned in your router configuration, usually "admin".
If you provide us with the exact model number of your router, which can be found on the router itself, we can provide you with the exact location or the reset button and what will be the credentials to log in after the reset.
you have single web/proxy server or it is separate.
two IP's in a machine or you've natted it on router.
which web server are you using with which OS.
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