Имя интерфейса usb модема

dhcpd usb0

# dhcpcd usb0
dhcpcd-10.1.0 starting
DUID 00:01:00:01:2e:6b:0a:c6:c2:dc:1e:51:fb:79
usb0: interface not found
dhcpcd exited

# ifconfig -a
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.11  netmask 255.255.255.0  broadcast 192.168.1.255
        ether d8:50:e6:54:cc:cc  txqueuelen 1000  (Ethernet)
        RX packets 21362859  bytes 30441469509 (28.3 GiB)
        RX errors 0  dropped 17  overruns 0  frame 0
        TX packets 10242870  bytes 1718974734 (1.6 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth1: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether de:a7:2c:42:e3:f4  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 152  bytes 14818 (14.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 152  bytes 14818 (14.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0