ifconfig.md - Openharmony v1.0 / docs / docs-en / kernel - 最全华为鸿蒙分布式操作系统技术资料库，手册，指南

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ifconfig.md

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# ifconfig
## Command Function
This command is used to query and set parameters of a NIC, such as the IP address, subnet mask, gateway, and MAC address, and enable or disable the NIC.
## Syntax
ifconfig
\[_-a_\]
<_interface_\> <_address_\> \[_netmask _\] \[_gateway _\]
\[_hw ether _\] \[_mtu _\]
\[_inet6 add _\]
\[_inet6 del _\]
\[_up|down_\]
## Parameter Description
**Table 1** Parameters

Parameter	Description	Value Range
No parameter	Displays information about all NICs, including the IP addresses, subnet masks, gateways, MAC addresses, maximum transmission units (MTUs), and running statuses.	N/A
-a	Displays data sent and received by the protocol stack.	N/A
interface	Indicates the NIC name, for example, eth0.	N/A
address	Indicates the IP address, for example, 192.168.1.10. The NIC name must be specified.	N/A
netmask	Indicates the subnet mask, for example, 255.255.255.0.	N/A
gateway	Indicates the gateway, for example, 192.168.1.1.	N/A
hw ether	Indicates the MAC address, for example, 00:11:22:33:44:55. Currently, only the ether hardware type is supported.	N/A
mtu	Indicates the MTU size, for example, 1000.	For IPv4: [68,1500] For IPv6: [1280, 1500]
add	Indicates 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. The NIC name and inet6 must be specified.	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
- This command can be used only after the TCP/IP protocol stack is enabled.
- Detecting the IP address conflict takes a period of time. Each time you run the **ifconfig** command to set an IP address, there is a delay of about 2 seconds.
## Example
1. ifconfig eth0 192.168.100.31 netmask 255.255.255.0 gateway 192.168.100.1 hw ether 00:49:cb:6c:a1:31
2. ifconfig -a
3. ifconfig eth0 inet6 add 2001:a:b:c:d:e:f:d
4. ifconfig eth0 inet6 del 2001:a:b:c:d:e:f:d
## Output
1. Setting 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
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
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
```
The following table describes the output parameters.
**Table 2** Output description

Parameter	Description
ip	Indicates the IP address of the board.
netmask	Indicates the subnet mask.
gateway	Indicates the gateway.
HWaddr	Indicates the MAC address of the board.
MTU	Indicates the MTU.
Running/Stop	Indicates whether the NIC is running.
Default	Indicates that the NIC is connected to the default gateway.
Link UP/Down	Indicates the connection status of the NIC.

2. Obtaining 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)
```
The following table describes the output parameters.
**Table 3** ifconfig -a output description

Parameter	Description
RX packets	Indicates the number of normal packets that have been received at the IP layer.
RX error	Indicates the number of error packets that have been received at the IP layer. The errors include the length, verification, IP option, and IP header protocol errors.
RX dropped	Indicates the number of packets that have been discarded at the IP layer. Packets may be discarded due to packet errors, packet forwarding failures, and disabled local NICs.
RX overrun	Indicates the number of packets that the MAC layer fails to deliver to the upper-layer protocol stack. The failure is mainly caused by resource insufficiency at the protocol stack.
RX bytes	Indicates the total length of normal packets that have been received at the IP layer, excluding the length of the fragments that are not reassembled.
TX packets	Indicates the number of packets that have been normally sent or forwarded at the IP layer.
TX error	Indicates the 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	Indicates the number of packets that the MAC layer discards due to sending failures, for example, the NIC driver fails to process the packets.
TX overrun	Reserved.
TX bytes	Indicates the total length of the packets that the IP layer has successfully sent or forwarded.

3. Setting the IPv6 address information:
```
OHOS # ifconfig eth0 inet6 add 2001:a:b:c:d:e:f:d
OHOS # ifconfig
eth1 ip:192.168.3.60 netmask:255.255.255.0 gateway:0.0.0.0
HWaddr 00:0e:c6:a8:5a:c2 MTU:1500 Running Link UP
eth0 ip:192.168.2.60 netmask:255.255.255.0 gateway:0.0.0.0
ip6: 2001:A:B:C:D:E:F:D/64
HWaddr 46:44:02:02:03:03 MTU:1500 Running Link UP
lo ip:127.0.0.1 netmask:255.0.0.0 gateway:127.0.0.1
ip6: ::1/64
HWaddr 00 MTU:16436 Running Link UP
```
4. Deleting the IPv6 address information:
```
OHOS # ifconfig eth0 inet6 del 2001:a:b:c:d:e:f:d
OHOS # ifconfig
eth1 ip:192.168.3.60 netmask:255.255.255.0 gateway:0.0.0.0
HWaddr 00:0e:c6:a8:5a:c2 MTU:1500 Running Link UP
eth0 ip:192.168.2.60 netmask:255.255.255.0 gateway:0.0.0.0
HWaddr 46:44:02:02:03:03 MTU:1500 Running Link UP
lo ip:127.0.0.1 netmask:255.0.0.0 gateway:127.0.0.1
ip6: ::1/64
HWaddr 00 MTU:16436 Running Link UP
```