display dns statistics packet

Function

The display dns statistics packet command displays statistics about DNS packets sent and received.

Format

display dns statistics packet

Parameters

None

Views

All views

Default Level

1: Monitoring level

Task Name and Operations

Task Name	Operations
dns	read

Usage Guidelines

Usage Scenario

To check statistics about DNS packets sent and received during domain name queries when the device functions as a DNS client, run the display dns statistics packet command.

Before collecting statistics about DNS packets sent and received, run the reset dns statistics packet command to clear existing statistics. Then you can run the display dns statistics packet command to check the statistics in a specified period.

Example

The actual command output varies according to the device. The command output here is only an example.

# Display statistics about DNS packets sent and received.

<HUAWEI> display dns statistics packet
--------------------------------------------------------------------------
Received response:
  Total packets         : 1         
    Udp packets         : 1             Tcp packets           : 0             
  RR types:
    A                   : 3             AAAA                  : 0         
    CNAME               : 1             PTR                   : 0         
    Unsupport           : 0           
  Discarded packets     : 0         
    Udp packets         : 0             Tcp packets           : 0         
    Length err          : 0             Id err                : 0         
    Packet server err   : 0             Response code err     : 0         
    Truncated           : 0             Question count err    : 0         
    Answer count err    : 0             Expand name fail      : 0         
    Class err           : 0             Others err            : 0                     

Sent request:
  Total packets         : 1         
    Udp packets         : 1             Tcp packets           : 0             
    Standard            : 1             Inverse               : -         
  Question types:
    A                   : 1             AAAA                  : 0         
    PTR                 : 0           
--------------------------------------------------------------------------

**Table 1** Description of the **display dns statistics packet** command output
Item	Description
Received response	Statistics about received DNS packets.
Total packets	Total number of sent/received DNS packets.
Udp packets	Total number of received, discarded, or sent UDP packets.
Tcp packets	Total number of received, discarded, or sent TCP packets.
RR types	Statistics about received DNS packets with specific resource record (RR) types. Discarded DNS packets that carry RR types are not counted. If the RR types carried in DNS packets that are received and not discarded can be identified, they are counted by specific types. If these RR types cannot be identified, they are counted in the Unsupport field.
A	Number of received or sent DNS packets carrying an A RR. An A RR records an IPv4 address obtained based on a domain name.
AAAA	Number of received or sent DNS packets carrying an AAAA RR. An AAAA RR records an IPv6 address obtained based on a domain name.
CNAME	Number of received DNS packets carrying a CNAME RR. A CNAME RR records an alias obtained based on a domain name.
PTR	Number of received/sent DNS packets carrying a PTR RR. A PTR RR records a domain name obtained based on an IPv4/IPv6 address.
Unsupport	Number of received DNS packets carrying a unidentifiable RR.
Discarded packets	Number of discarded DNS packets, among the ones received. Packets that fail to generate dynamic entries are discarded. As long as the packets have options that can correctly generate entries, the packets are not counted in the number of discarded packets.
Length err	Number of packets discarded due to length errors.
Id err	Number of packets discarded due to ID errors.
Packet server err	Number of packets discarded due to server errors.
Response code err	Number of packets discarded due to code errors.
Truncated	Number of discarded truncated packets.
Question types	Statistics about sent DNS packets with specific query types.
Question count err	Number of packets discarded due to query errors.
Answer count err	Number of packets discarded due to response errors.
Expand name fail	Number of packets discarded due to incorrect file name extensions.
Class err	Count of discarded class error packets.
Others err	Count of discarded other error packets.
Sent request	Statistics about sent DNS packets.
Standard	Number of sent DNS packets of the Standard type.
Inverse	Number of sent DNS packets of the Inverse type.