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Interpreting netstat -s


 
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# 1  
Old 07-25-2001
Question Interpreting netstat -s

Are there any references I can look up for to interprete "netstat -s", especially those on TCP statistics.
# 2  
Old 07-25-2001

I don't understand your questions... What do you want to interpret? Do you want a more user-friendly listing from netstat? Do you want more information on a specific stat?
# 3  
Old 07-25-2001
netstat -s

Sorry for not posing my question clearly.

I wish to know the meaning of individual statistics output by "netstat -s".
# 4  
Old 07-25-2001

Well, it's very hard to explain them all if you don't understand TCP/IP. They show stuff that isn't too useful unless you're looking for something specific, or troubleshooting a network bug. Look for a primer on the TCP/IP protocol if you want to understand the output of `netstat -s`.
# 5  
Old 07-25-2001
I am trying to check on whether file descriptors has been exhausted. Which statistic should I refer to for this ?

If a process is trying to open up a socket, and the file description limit has exceeded, will there be any error log shown (eg in /var/adm/message) ?
# 6  
Old 07-25-2001
Example output of netstat -s:

[quote]
athlon# netstat -s
Ip:
461270 total packets received
0 forwarded
0 incoming packets discarded
288 incoming packets delivered
374553 requests sent out
8 dropped because of missing route
Icmp:
29 ICMP messages received
0 input ICMP message failed.
ICMP input histogram:
destination unreachable: 29
899 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 899
Tcp:
34 active connections openings
0 passive connection openings
0 failed connection attempts
0 connection resets received
1 connections established
460013 segments received
373502 segments send out
993 segments retransmited
0 bad segments received.
2 resets sent
Udp:
123 packets received
32 packets to unknown port received.
0 packet receive errors
152 packets sent
TcpExt:
[/code]

There is nothing here that discusses file descriptors. This simply provides statistics about sockets, packets, tcp segments, and connections.

This command is not used to check for file descriptor usage.

# 7  
Old 07-25-2001
thnx Neo Smilie
I was just trying to check if there is any failed connections, perhaps due to fd exhausted.
 

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