High utilization on the router interface facing the internet,MRTG shows bandwidth fully utilized this could be attack or server malfunctioning. how to restrict the bandwidth for incoming and outgoing traffic how to identify which internal resource utilizing how much bandwidth
Best tool to use to identify bandwidth utilization and hosts involved is NetFlow. You can gather some stats directly from the router but it is best to actually use a NetFlow collector of some type. See your IOS docs on configuring NetFlow.
There are couple of options available depending on your location.
Type of your location - Data Centre (where servers located) accessed by multiple sites or Branch Office
Type of your traffic - Inbound and Outbound - MRTG graph will share this information
ISP Router - Own by you (you can control ISP devices) / partner (you can advise your provider for configuration) / third party (you cannot control their device)
What is the bandwidth utilization -- 10% ---100% and what is the trend -- occansional or permanant
What is the impact of this
Possible action at the moment
Measure traffic with the help of netflow or any other similar tool. This tool will provide you information on source IP, Destination IP, Source Protocol and Destination protocol. This will identify who is using or misusing the link. You can show the logs to user as evidences of use or misuse of internet link
Once you identify then try to restrict the traffic at source only. Either L-3 switch near to users or LAN interface of the router.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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