Compaq Compaq TCP/IP Services for OpenVMS Servisní příručka stáhnout pdf (Strana 17)

Troubleshooting Techniques and Tools

1.2 Isolating Problems

1.2.4 Examining Network Statistics

Use the

netstat

utility or the SHOW INTERFACE command to check interface

and protocol statistics, per-connection status, and memory buffer use. Look for

bad checksums, excessive retransmissions, dropped packets, out-of-order packets,

and lost-carrier errors.

For example:

TCPIP> netstat -i

Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll

TN0* 1280 Link Link#2 0 0 0 0 0

WF0 4470 Link 00:00:f8:cd:1e:e4 48855499 0 2035244 0 0

WF0 4470 16.20 ucxaxp 48855499 0 2035244 0 0

LO0 4096 Link Link#1 165084 0 165084 0 0

LO0 4096 127 LOCALHOST 165084 0 165084 0 0

Some problems to look for are:

• If the output of the

netstat -i

command shows excessive amounts of input

errors (Ierrs), output errors (Oerrs), or collisions (Coll), this may indicate a

network problem; for example, cables may not be connected properly or the

Ethernet may be saturated.

• The

netstat -m

command shows statistics for network-related data

structures. Use this command to determine if the network is using an

excessive amount of memory in proportion to the number of sockets in use.

• The

netstat -an

displays allocated sockets (each socket results in a network

connection).

The following example shows the output of the

netstat -m

command:

TCPIP> netstat -m

1328 mbufs in use:

2 mbufs allocated to data

2 mbufs allocated to ancillary data

139 mbufs allocated to socket structures

244 mbufs allocated to protocol control blocks

442 mbufs allocated to routing table entries

2 mbufs allocated to socket names and addresses

26 mbufs allocated to interface addresses

1 mbufs allocated to ip multicast options

2 mbufs allocated to ip multicast addresses

5 mbufs allocated to interface multicast addresses

48 mbufs allocated to NFS request header

1 mbufs allocated to vnode struct

32 mbufs allocated to kern credential data structure

2 mbufs allocated to mbuf extra-data protocol message

58 mbufs allocated to assorted NFS structures

6 mbufs allocated to network interface structure

2 mbufs allocated to netisr thread queues

5 mbufs allocated to Inet PCB queues

1 mbufs allocated to rad specific structures

1 mbufs allocated to OpenVMS Cluster Alias table

37 mbufs allocated to OpenVMS Kernel VCI structure

12 mbufs allocated to OpenVMS TCPIP Timer structure

3 mbufs allocated to OpenVMS LAN VCI VCIB structure

3 mbufs allocated to OpenVMS LAN MCAST_REQ structure

12 mbufs allocated to OpenVMS SELECT structure

1 mbufs allocated to OpenVMS ACP Filter Buffer

1 mbufs allocated to OpenVMS ACP AQB

1 mbufs allocated to OpenVMS ACP INETCB

2 mbufs allocated to OpenVMS Driver requested REQCB

26 mbufs allocated to OpenVMS ACP allocated SERV Structure

Troubleshooting Techniques and Tools 1–7

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 117 118

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