harmony 鸿蒙ifconfig

2022-08-09
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ifconfig

Command Function

This command can be used to:

Query and set parameters of a network interface card (NIC), such as the IP address, network mask, gateway, and MAC address.
Enable or disable a NIC.

Syntax

ifconfig [option]

option:

[-a]
<interface> <address> [netmask <mask>] [gateway <address>]
[hw ether <address>] [mtu <size>]
[inet6 add <address>]
[inet6 del <address>]
[up|down]

Parameters

Table 1 Parameter description

Parameter	Description	Value Range
No parameter	Displays all NIC information, which includes the IP address, network mask, gateway, MAC address, maximum transmission unit (MTUs), and running status of each NIC.	N/A
-a	Displays data sent and received by the protocol stack.	N/A
interface	Specifies the NIC name, for example, eth0.	N/A
address	Specifies the IP address, for example, 192.168.1.10. The NIC name must be specified.	N/A
netmask	Specifies the subnet mask, for example, 255.255.255.0.	N/A
gateway	Specifies the gateway, for example, 192.168.1.1.	N/A
hw ether	Specifies the MAC address, for example, 00:11:22:33:44:55. Currently, only the ether hardware type is supported.	N/A
mtu	Specifies the MTU size, for example, 1000.	- IPv4: [68, 1500] - IPv6:[1280, 1500]
add	Specifies the IPv6 address, for example, 2001:a:b:c:d:e:f:d. The NIC name and inet6 must be specified.	N/A
del	Deletes an IPv6 address. You need to specify the NIC name and add the inet6 option. For details, see the example.	N/A
up	Enables the data processing function of the NIC. The NIC name must be specified.	N/A
down	Disables the data processing function of the NIC. The NIC name must be specified.	N/A

Usage Guidelines

This command can be used only after the TCP/IP stack is enabled.
Detecting an IP address conflict takes time. Each time you run the ifconfig command to set an IP address, there is a delay of about 2 seconds.

Example

ifconfig eth0 192.168.100.31 netmask 255.255.255.0 gateway 192.168.100.1 hw ether 00:49:cb:6c:a1:31
ifconfig -a
ifconfig eth0 inet6 add 2001:a:b:c:d:e:f:d
ifconfig eth0 inet6 del 2001:a:b:c:d:e:f:d

Output

Example 1: Set network parameters.

  OHOS:/$ ifconfig eth0 192.168.100.31 netmask 255.255.255.0 gateway 192.168.100.1 hw ether 00:49:cb:6c:a1:31
  OHOS:/$ ifconfig
  lo      ip:127.0.0.1 netmask:255.0.0.0 gateway:127.0.0.1
          ip6: ::1/64
          HWaddr 00 MTU:0 Running Link UP
  eth0    ip:192.168.100.31 netmask:255.255.255.0 gateway:192.168.100.1
          HWaddr 00:49:cb:6c:a1:31 MTU:1500 Running Default Link UP

Table 2 Parameter description

Parameter	Description
ip	IP address of the board.
netmask	Subnet mask.
gateway	Gateway.
HWaddr	MAC address of the board.
MTU	Maximum transmission unit.
Running/Stop	Whether the NIC is running.
Default	Indicates that the NIC is connected to the default gateway.
Link UP/Down	Connection status of the NIC.

Example 2: Obtain protocol stack statistics.

  OHOS # ifconfig -a
  RX packets:6922  errors:0        ip dropped:4312         link dropped:67         overrun:0       bytes:0 (0.0 B)
  RX packets(ip6):3     errors:0        dropped:0       overrun:0       bytes:0 (0.0 B)
  TX packets:1394  errors:0        link dropped:67         overrun:0       bytes:0(0.0 B)
  TX packets(ip6):3     errors:0        overrun:0       bytes:0(0.0 B)

Table 3 ifconfig -a parameter description

Parameter	Description
RX packets	Number of normal packets received at the IP layer.
RX error	Number of error packets received at the IP layer. The errors include the length error, verification error, IP option error, and IP header protocol error.
RX dropped	Number of packets discarded at the IP layer. Packets are discarded due to packet errors, packet forwarding failures, and disabled local NICs.
RX overrun	Number of packets that the MAC layer fails to deliver to the upper-layer protocol stack. The failure is caused by resource insufficiency at the protocol stack.
RX bytes	Total length of normal packets received at the IP layer, excluding the length of the fragments that are not reassembled.
TX packets	Number of packets that have been normally sent or forwarded at the IP layer.
TX error	Number of packets that the IP layer fails to send. Packets may fail to be sent because the packets cannot be routed or the packets fail to be processed in the protocol stack.
TX dropped	Number of packets that the MAC layer discards due to delivery failures, for example, the NIC driver fails to process the packets.
TX overrun	Not used currently.
TX bytes	Total length of the packets successfully sent or forwarded at the IP layer.

Example 3: Set an IPv6 address.

  OHOS:/$ ifconfig eth0 inet6 add 2001:a:b:c:d:e:f:d
  NetifStatusCallback(eth0): nsc event: 0x8
  NetifStatusCallback(eth0): nsc status changed: 0
  NetifStatusCallback(eth0): nsc event: 0x200
  NetifStatusCallback(eth0): nsc event: 0x8
  NetifStatusCallback(eth0): nsc status changed: 1
  NetifStatusCallback(eth0): nsc event: 0x200
  NetifStatusCallback(eth0): nsc event: 0x200
  OHOS:/$ ifconfig
  lo      ip:127.0.0.1 netmask:255.0.0.0 gateway:127.0.0.1
          ip6: ::1/64
          HWaddr 00 MTU:0 Running Link UP
  eth0    ip:192.168.1.10 netmask:255.255.255.0 gateway:192.168.1.1
          ip6: 2001:A:B:C:D:E:F:D/64
          HWaddr 66:2f:e5:bd:24:e6 MTU:1500 Running Default Link UP

Example 4: Delete an IPv6 address.

  OHOS:/$ ifconfig eth0 inet6 del 2001:a:b:c:d:e:f:d
  NetifStatusCallback(eth0): nsc event: 0x200
  OHOS:/$ ifconfig
  lo      ip:127.0.0.1 netmask:255.0.0.0 gateway:127.0.0.1
          ip6: ::1/64
          HWaddr 00 MTU:0 Running Link UP
  eth0    ip:192.168.1.10 netmask:255.255.255.0 gateway:192.168.1.1
          HWaddr 66:2f:e5:bd:24:e6 MTU:1500 Running Default Link UP