I know that MRTG can get the plot of packet rate by reading subsequent values of packet counter at 5min interval and then calculate the average value. However, I want to get the instant 5min packet rate by reading a MIB object (get the result similar to sh interface command). In some DoS cases, it is important for me to get the instant packet rate of each switch port.
You will get the same value if you look at the MIBs ifInUcastPkts + ifInNUcastPkts and ifOutUcastPkts + ifOutNUcastPkts at a five minute interval. Take reading, subtract previous reading, divide by 300 seconds ((Reading2 - Reading1)/Seconds). You figure you would have to look at the packet rate every five minutes anyway (if it is only a five minute average) so you are not going to be doing much extra work. Also, by reporting the packet counter instead of an average over time, you can get more granular results (just read the value every minute and divide by 60 and you get average over a minute).
Our University has more than 20,000 ports. It is not pratical to keep track the byte counts of each port and then calculate the packet rate. We monitor the uplink port of each wirig closet by MRTG only. In case of abnormal traffic like very very high packet rate at the uplink, I want to find out the user port with the highest packet rate by snmp at that time. I prefer to use snmp since it is simple. However, if there is no such MIB available, I will consider to use TELNET moudle of perl to extract the interface statistic directly.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...