К роутеру подключено 2 модема AnyData ADU-520A. В /etc/ppp/peers/ лежит 2 файла настроек, отличающихся только именем устройства - /dev/ttyUSB0 и /dev/ttyUSB5 соответственно. В /etc/network/interfaces они прописаны так:
auto ppp0
iface ppp0 inet ppp
provider skylink
auto ppp1
iface ppp1 inet ppp
provider skylink2
Ниже вывод dmesg и lsusb
[ 10.493127] usb-storage: device scan complete
[ 10.496121] scsi 3:0:0:0: CD-ROM AnyDATA CD-ROM 1.00 PQ
: 0 ANSI: 2
[ 10.901352] usb-storage: device scan complete
[ 10.904334] scsi 4:0:0:0: CD-ROM AnyDATA CD-ROM 1.00 PQ
: 0 ANSI: 2
[ 11.296601] usbcore: registered new interface driver usbserial
[ 11.296688] usbserial: USB Serial support registered for generic
[ 11.296816] usbcore: registered new interface driver usbserial_generic
[ 11.296880] usbserial: USB Serial Driver core
[ 11.307240] usbserial: USB Serial support registered for GSM modem (1-port)
[ 11.307345] option 1-2:1.0: GSM modem (1-port) converter detected
[ 11.307502] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB0
[ 11.307582] option 1-2:1.1: GSM modem (1-port) converter detected
[ 11.307700] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB1
[ 11.307778] option 1-2:1.2: GSM modem (1-port) converter detected
[ 11.307895] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB2
[ 11.307975] option 2-1:1.0: GSM modem (1-port) converter detected
[ 11.308139] usb 2-1: GSM modem (1-port) converter now attached to ttyUSB3
[ 10.493127] usb-storage: device scan complete
[ 10.496121] scsi 3:0:0:0: CD-ROM AnyDATA CD-ROM 1.00 PQ
: 0 ANSI: 2
[ 10.901352] usb-storage: device scan complete
[ 10.904334] scsi 4:0:0:0: CD-ROM AnyDATA CD-ROM 1.00 PQ
: 0 ANSI: 2
[ 11.296601] usbcore: registered new interface driver usbserial
[ 11.296688] usbserial: USB Serial support registered for generic
[ 11.296816] usbcore: registered new interface driver usbserial_generic
[ 11.296880] usbserial: USB Serial Driver core
[ 11.307240] usbserial: USB Serial support registered for GSM modem (1-port)
[ 11.307345] option 1-2:1.0: GSM modem (1-port) converter detected
[ 11.307502] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB0
[ 11.307582] option 1-2:1.1: GSM modem (1-port) converter detected
[ 11.307700] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB1
[ 11.307778] option 1-2:1.2: GSM modem (1-port) converter detected
[ 11.307895] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB2
[ 11.307975] option 2-1:1.0: GSM modem (1-port) converter detected
[ 11.308139] usb 2-1: GSM modem (1-port) converter now attached to ttyUSB3
[ 11.308219] option 2-1:1.1: GSM modem (1-port) converter detected
[ 11.308337] usb 2-1: GSM modem (1-port) converter now attached to ttyUSB4
[ 11.308414] option 2-1:1.2: GSM modem (1-port) converter detected
[ 11.308530] usb 2-1: GSM modem (1-port) converter now attached to ttyUSB5
[ 11.308610] usbcore: registered new interface driver option
[ 11.308673] option: USB Driver for GSM modems: v0.7.2
[ 11.939046] input: PC Speaker as /class/input/input3
[ 12.129852] Error: Driver 'pcspkr' is already registered, aborting...
[ 12.220683] parport_pc 00:0b: reported by Plug and Play ACPI
[ 12.220800] parport0: PC-style at 0x378, irq 7 [PCSPP,TRISTATE]
[ 12.544649] Driver 'sr' needs updating - please use bus_type methods
[ 12.552123] sr0: scsi3-mmc drive: 0x/0x caddy
[ 12.552332] sr 3:0:0:0: Attached scsi CD-ROM sr0
[ 12.560160] sr1: scsi3-mmc drive: 0x/0x caddy
[ 12.560365] sr 4:0:0:0: Attached scsi CD-ROM sr1
[ 12.594024] sd 1:0:0:0: Attached scsi generic sg0 type 0
[ 12.594131] sr 3:0:0:0: Attached scsi generic sg1 type 5
[ 12.594223] sr 4:0:0:0: Attached scsi generic sg2 type 5
[ 13.392437] Adding 979956k swap on /dev/sda2. Priority:-1 extents:1 across:979956k
[ 20.449579] loop: module loaded
[ 20.490928] it87: Found IT8718F chip at 0x290, revision 1
[ 20.491004] it87: in3 is VCC (+5V)
[ 20.491062] it87: in7 is VCCH (+5V Stand-By)
[ 21.926038] NET: Registered protocol family 15
[ 22.128014] padlock: VIA PadLock Hash Engine not detected.
[ 22.225646] padlock: VIA PadLock Hash Engine not detected.
[ 22.428570] padlock: VIA PadLock not detected.
[ 23.445157] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 23.664849] nf_conntrack version 0.5.0 (8192 buckets, 32768 max)
[ 23.958063] PPP generic driver version 2.4.2
[ 24.120904] eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
[ 28.544192] lp0: using parport0 (interrupt-driven).
[ 28.562908] ppdev: user-space parallel port driver
[ 33.638557] sr0: CDROM (ioctl) error, command: Get configuration 46 00 00 00 00 00 00 00 20 00
[ 33.638557] sr: Sense Key : No Sense [current]
[ 33.638557] sr: Add. Sense: No additional sense information
[ 34.034749] sr1: CDROM (ioctl) error, command: Get configuration 46 00 00 00 00 00 00 00 20 00
[ 34.044462] sr: Sense Key : No Sense [current]
[ 34.044670] sr: Add. Sense: No additional sense information
[ 34.442257] PPP Deflate Compression module registered
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 16d5:6502 AnyDATA Corporation
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 16d5:6502 AnyDATA Corporation
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub