Background: Know: Recognize: IP, ICMP, TCP
Anticipates: MIBs
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Netstat shows statistics from MIBs[]
For IP protocols, the statistics, those netstat-s displays, are about packets:Netstat (network statistics) is a command-line tool that displays network connections (both incoming and outgoing), routing tables, and a number of network interface statistics. There are different types of options to netstat which netstat-s is one of them. The netstat -s command displays statistics for some protocols such as TCP, IP and ICMP.
- Total number of packets received
- Number of packets with invalid header
- Number of incoming packets delivered/ discarded
- Number of outgoing packets drooped
- Number of packets dropped because of missing route
- Number of fragments dropped after time out
- Number of reassemblies required and how many of them failed or reassembled well
- Number of fragments received well/ created
In terms of TCP, netstat-s can provide some statistics mostly about connections:
- Number of active/ passive connections openings
- Number of failed connection attempts
- Number of connections established
- Number of segments received/ sent out
For ICPM protocol, it displays statistics about ICMP input histogram messages:
- Destination unreachable
- Number of echo requests/ replies
- Time out in transit
- Number of messages sent/ failed
And for ICMP output histogram, it shows:
- Destination unreachable
- Number of echo replies
You can see some examples of netstat outputs below:
Reference
Optimizing nfs performance ,"tuning and troubleshooting nfs on hp-ux systems". Dave Olker