androd和qnx判断实网卡还是虚网卡

android

ry:/ # ethtool eth0

Settings for eth0:

Supported ports: [ TP MII ]

Supported link modes: 100baseT/Full

1000baseT/Full

Supported pause frame use: Symmetric Receive-only

Supports auto-negotiation: No

Supported FEC modes: Not reported

Advertised link modes: 100baseT/Full

1000baseT/Full

Advertised pause frame use: Symmetric Receive-only

Advertised auto-negotiation: No

Advertised FEC modes: Not reported

Speed: 100Mb/s

Duplex: Full

Port: MII

PHYAD: 7

Transceiver: internal

Auto-negotiation: off

Supports Wake-on: d

Wake-on: d

Current message level: 0x0000003f (63)

drv probe link timer ifdown ifup

Link detected: no

断依据如下：

输出中包含明确的物理链路参数 ：比如 Supported ports: [ TP MII ]（支持的物理端口类型）、PHYAD: 7（PHY 芯片地址）、Transceiver: internal（内置收发器），这些都是实网卡独有的硬件关联信息，虚网卡不会有这类参数。
显示了链路速率、双工模式等物理层配置：Speed: 100Mb/s、Duplex: Full，这是物理网卡与外部设备（如 switch、ADCC）协商的物理链路属性，虚网卡无独立物理层，无法输出这类信息。

补充说明：输出里的 Link detected: no 只是表示当前该实网卡没有检测到物理链路连接（比如没接网线、对端设备未上电、端口未启用），不影响它是实网卡的属性。

ifconfig

eth0 Link encap:Ethernet HWaddr aa:aa:aa:aa:aa:b1 Driver virtio_net

inet addr:192.168.1.103 Bcast:192.168.1.255 Mask:255.255.255.0

inet6 addr: fe80::c8b6:916a:1715:b3a6/64 Scope: Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:42151 errors:0 dropped:0 overruns:0 frame:0

TX packets:43228 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:15148445 TX bytes:8899801

eth2 Link encap:Ethernet HWaddr 42:41:49:43:00:20 Driver qcom-ethqos

inet addr:192.168.7.3 Bcast:192.168.7.255 Mask:255.255.255.0

inet6 addr: fe80::c092:dc9a:52fb:90e7/64 Scope: Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:635 errors:0 dropped:0 overruns:0 frame:0

TX packets:1184 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:71534 TX bytes:189278

Interrupt:18

eth2.2 Link encap:Ethernet HWaddr 42:41:49:43:00:20

inet addr:192.168.2.6 Bcast:192.168.2.255 Mask:255.255.255.0

inet6 addr: fe80::953b:cb63:24f0:d98a/64 Scope: Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:204 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 TX bytes:35910

eth2 网卡：物理网卡（实网卡）

核心判定点 ：qcom-ethqos 是高通（Qualcomm）的物理以太网驱动，适配高通系列芯片（包括 8155）的硬件网口，直接绑定物理 PHY 芯片和网口

Interrupt:18 中断号为 18物理网卡独有：硬件设备需通过中断号与 CPU 通信，虚拟网卡无硬件中断

ic:/ # ethtool eth2

Settings for eth2:

Supported ports: [ MII ]

Supported link modes: 1000baseT/Full

Supported pause frame use: Symmetric Receive-only

Supports auto-negotiation: Yes

Supported FEC modes: Not reported

Advertised link modes: 1000baseT/Full

Advertised pause frame use: Symmetric Receive-only

Advertised auto-negotiation: Yes

Advertised FEC modes: Not reported

Link partner advertised link modes: 1000baseT/Full

Link partner advertised pause frame use: No

Link partner advertised auto-negotiation: No

Link partner advertised FEC modes: Not reported

Speed: 1000Mb/s

Duplex: Full

Port: MII

PHYAD: 0

Transceiver: internal

Auto-negotiation: on

Supports Wake-on: d

Wake-on: d

Current message level: 0x0000003f (63)

drv probe link timer ifdown ifup

Link detected: yes

qnx

emac0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500

options=64039b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>

ether 42:41:49:43:00:21

inet6 fe80::4041:49ff:fe43:21%emac0 prefixlen 64 scopeid 0x5

media: Ethernet autoselect (1000baseT <full-duplex>)

status: active

nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

lan0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500

options=200301<RXCSUM,TSO4,TSO6,RXCSUM_IPV6>

ether 42:41:49:43:00:21

inet6 fe80::4041:49ff:fe43:21%lan0 prefixlen 64 scopeid 0x6

inet 192.168.1.101 netmask 0xffffff00 broadcast 192.168.1.255

vlan: 7 vlanproto: 802.1q vlanpcp: 0 parent interface: emac0

media: Ethernet autoselect (1000baseT <full-duplex>)

status: active

groups: vlan

nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

确区分：emac0 是实网卡，lan0 是基于 emac0 创建的虚网卡。

emac0：实网卡（物理网卡）
- 名称特征 ：emac 是 QNX 系统中对 物理以太网控制器 的标准命名（对应硬件 MAC 控制器），直接关联物理网口和 PHY 芯片。
- 硬件能力参数 ：options 里包含 VLAN_HWTAGGING（硬件 VLAN 打标签）、VLAN_HWCSUM（硬件校验和计算）等物理网卡独有的硬件加速功能，虚拟网卡不具备这类硬件级能力。
- 无父接口关联：输出中没有标注 "基于其他网卡创建"，是独立的物理接口。
- 状态属性 ：media: Ethernet autoselect (1000baseT <full-duplex>) 直接显示物理链路的协商速率和双工模式，是物理网卡的典型特征。
lan0：虚网卡（VLAN 虚拟