Linux，添加子接口

Question

我首先会说网络不是我的强项，我正在尝试配置一些子接口，以便我正在工作的一些代码将有更多的套接字可以本地绑定到。到目前为止，我已经完成了以下操作，我可以在本地绑定到我的子接口 192.168.2.210，但是我无法与它进行远程连接。

这是我的 ifconfig：

eth0      Link encap:Ethernet  HWaddr 00:50:56:BB:00:0B  
          inet addr:10.6.19.18  Bcast:10.255.255.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:febb:b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1056026 errors:0 dropped:0 overruns:0 frame:0
          TX packets:638290 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:237037186 (226.0 MiB)  TX bytes:126161362 (120.3 MiB)

eth0:1    Link encap:Ethernet  HWaddr 00:50:56:BB:00:0B  
          inet addr:192.168.2.210  Bcast:192.168.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

这是我尝试配置 eth0:1 的方法

ifconfig eth0:1 192.168.2.210/32 up
ip route add 192.168.2.210/32 via 10.6.19.18

这是我的 netstat -r 输出：

192.168.2.210   devserv.        255.255.255.255 UGH       0 0          0 eth0
192.168.2.0     *               255.255.255.0   U         0 0          0 eth0
10.6.19.0       *               255.255.255.0   U         0 0          0 eth0
link-local      *               255.255.0.0     U         0 0          0 eth0
default         10.6.19.1       0.0.0.0         UG        0 0          0 eth0

有什么想法吗？感谢您的关注

Answer 1

放弃 ifconfig，因为 iproute2 包正在逐步淘汰它；

root@bensley-n2:~# ip address show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:e0:4c:6d:0a:49 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 74:ea:3a:ad:2e:00 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.5/24 brd 192.168.0.255 scope global wlan0
    inet6 fe80::76ea:3aff:fead:2e00/64 scope link 
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 
    link/ether ce:70:78:f8:10:75 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
root@bensley-n2:~# ip address add 1.1.1.1/24 dev wlan0
root@bensley-n2:~# ip address show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:e0:4c:6d:0a:49 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 74:ea:3a:ad:2e:00 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.5/24 brd 192.168.0.255 scope global wlan0
    inet 1.1.1.1/24 scope global wlan0
    inet6 fe80::76ea:3aff:fead:2e00/64 scope link 
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 
    link/ether ce:70:78:f8:10:75 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
root@bensley-n2:~# ip route show
default via 192.168.0.1 dev wlan0 
1.1.1.0/24 dev wlan0  proto kernel  scope link  src 1.1.1.1 
192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.5 
192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1

（您可以缩写ip命令：ip address add可以一直缩短为ip a a，并且ip address show可以缩短为ip a s.show如果您不指定第二个参数，则是默认操作，因此ip a如果您想真正简洁，则只需键入即可。）

您也不需要为本地子网添加路由。

Answer 2

与其添加更多地址（这会变得有点复杂），为什么您的套接字不使用不同的端口？