How to use VLAN to separate multiple PDN
========================================
Here we take 1802s (i.e. NezhaS) as example, 1826 (i.e. Nezha3) is similar.
The host PC system tested in this paper is Ubuntu 5.4.0-6Ubuntu 1~16.04.12.
Here we explains both the IPv4 and IPv6, you can ignore the IPv6 part if deploy the IPv4 only.

1, PIPE mode
1) Diag
	default PDN:
		"serial_client"
		"AT+ZGDCONT=1,IPV4V6,CMNET"
		"AT+ZGACT=1,1"
	PDN2:
		"AT*ZGDCONT=2,IPV4V6,CMWAP,1"
		"AT+ZGACT=1,2"
	PDN3:
		"AT*ZGDCONT=3,IPV4V6,GPRS,1"
		"AT+ZGACT=1,3"	

	Query the dial results with command "AT+CGDCONT?", you will get some information like this:

		+CGDCONT: 1,"IPV4V6","cmnet","10.171.20.111 254.128.0.0.0.0.0.0.0.0.0.0.0.0.0.1",0,0,0,2,0,0

		+CGDCONT: 2,"IPV4V6","CMWAP","10.184.75.11 254.128.0.0.0.0.0.0.0.0.0.0.0.0.0.1",0,0,0,2,0,0

		+CGDCONT: 3,"IPV4V6","GPRS","10.185.130.179 254.128.0.0.0.0.0.0.0.0.0.0.0.0.0.1",0,0,0,2,0,0

	As listed above , "10.171.20.111" is the IPv4 address of PDN1 and same for the others.

2) Configure /etc/config/network
	Add the following configuration to "/etc/config/network":

		config switch
			option name 'switch0'
			option reset '1'
			option enable_vlan '1'

		config interface 'lan2'
			option ifname 'usbnet0.100'
			option type 'bridge'
			option bridge_empty '1'
			option proto 'static'
			option ipaddr '10.184.75.244'
			option netmask '255.255.255.0'
			option ip6assign '60'

		config interface 'lan3'
			option ifname 'usbnet0.200'
			option type 'bridge'
			option bridge_empty '1'
			option proto 'static'
			option ipaddr '10.185.130.76'
			option netmask '255.255.255.0'
			option ip6assign '60'

	usbnet0.100 and usbnet0.200 represent VLAN100 and VLAN200, "option ipaddr" is the ip address of PDN, 
	but the last bit requires an xor operation.
	Then execute "/etc/init.d/network reload" to apply the configuration.

3) Configure /etc/config/dhcp
	Add the following configuration to "/etc/config/dhcp":

		config dhcp 'lan2'
			option interface 'lan2'
			option leasetime '2h'
			option dhcpv6 'server'
			option ra 'relay'
			option ndp 'relay'
			option start '11'
			option limit '0'
			list dhcp_option '3,10.184.75.244'
			list dhcp_option '1,255.255.255.0'
			list dhcp_option '6,61.132.163.68,202.102.213.68'
			list dns '240e:46:4088::4088'
			list dns '240e:46:4888::4888'

		config dhcp 'lan3'
			option interface 'lan3'
			option leasetime '2h'
			option dhcpv6 'server'
			option ra 'relay'
			option ndp 'relay'
			option start '179'
			option limit '0'
			list dhcp_option '3,10.185.130.76'
			list dhcp_option '1,255.255.255.0'
			list dhcp_option '6,202.102.213.68,61.132.163.68'
			list dns '240e:46:4088::4088'
			list dns '240e:46:4888::4888'

	"option start" is the offset from the PDN address of the underlying interface to calculate the minimum address that may be leased to clients.
	Then execute "/etc/init.d/dnsmasq reload" to apply the configuration.

4) Bind the virtual LAN to PDN
	Query the local IPv6 address for usbnet0:
		"cd /sys/kernel/mpipe/devices"
		"cat usbnet0/ll6addr", you will get the local IPv6 address:
		"fe80::e8c9:89ff:fe4a:3455"

	Configure virtual LAN:	
		"echo 192.168.100.1 > usbnet0.100/ipaddr"
		"echo fe80::e8c9:89ff:fe4a:3455 > usbnet0.100/ll6addr"
		"echo 1 > usbnet0.100/up"
		"echo 1 > usbnet0.100/up6"

		"echo 192.168.200.1 > usbnet0.200/ipaddr"
		"echo fe80::e8c9:89ff:fe4a:3455 > usbnet0.200/ll6addr"
		"echo 1 > usbnet0.200/up"
		"echo 1 > usbnet0.200/up6"

	Bind the virtual LAN to PDN
		"echo usbnet0.100 > ccinet1/combineif"
		"echo usbnet0.200 > ccinet2/combineif"
	Now the ccinet1 serves as VLAN100, and ccinet2 as VLAN200.

5)  Configuration in Ubuntu16.04
	Add virtual network card:
		"vconfig add enp0s26u1u1 100"
		"vconfig add enp0s26u1u1 200"

	Get IP address through DHCP:
		"dhcpcd enp0s26u1u1"
		"dhcpcd enp0s26u1u1.100"
		"dhcpcd enp0s26u1u1.200"
		
	# ifconfig
		enp0s26u1u1 Link encap:Ethernet  HWaddr a2:ca:7e:71:c8:e3
				  inet addr:10.171.20.111  Bcast:10.171.20.255  Mask:255.255.255.0
				  inet6 addr: 240e:9a:875:27a8:9094:7d7b:6bc9:904a/64 Scope:Global
				  inet6 addr: 240e:9a:875:27a8:ae42:2167:938a:268/64 Scope:Global
				  inet6 addr: fe80::a0ca:7eff:fe71:c8e3/64 Scope:Link
				  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
				  RX packets:709 errors:0 dropped:0 overruns:0 frame:0
				  TX packets:574 errors:0 dropped:0 overruns:0 carrier:0
				  collisions:0 txqueuelen:1000
				  RX bytes:69649 (69.6 KB)  TX bytes:118056 (118.0 KB)

		enp0s26u1u1.100 Link encap:Ethernet  HWaddr a2:ca:7e:71:c8:e3
				  inet addr:10.184.75.11  Bcast:10.184.75.255  Mask:255.255.255.0
				  inet6 addr: 240e:9a:868:af6d:693a:c829:7dbe:c2d5/64 Scope:Global
				  inet6 addr: fe80::a0ca:7eff:fe71:c8e3/64 Scope:Link
				  inet6 addr: 240e:9a:868:af6d:fcf6:78f5:3ef3:d159/64 Scope:Global
				  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
				  RX packets:9 errors:0 dropped:0 overruns:0 frame:0
				  TX packets:123 errors:0 dropped:0 overruns:0 carrier:0
				  collisions:0 txqueuelen:1000
				  RX bytes:1019 (1.0 KB)  TX bytes:18273 (18.2 KB)

		enp0s26u1u1.200 Link encap:Ethernet  HWaddr a2:ca:7e:71:c8:e3
				  inet addr:10.185.130.179  Bcast:10.185.130.255  Mask:255.255.255.0
				  inet6 addr: fe80::52c1:fbe:ad29:61c9/64 Scope:Link
				  inet6 addr: 240e:9a:874:b759:61f5:109:a46c:fe33/64 Scope:Global
				  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
				  RX packets:8 errors:0 dropped:0 overruns:0 frame:0
				  TX packets:98 errors:0 dropped:0 overruns:0 carrier:0
				  collisions:0 txqueuelen:1000
				  RX bytes:923 (923.0 B)  TX bytes:13673 (13.6 KB)

	Add the IPv4 routing:
		"route add -net 1.1.1.0/24 dev enp0s26u1u1"
		"route add -net 8.8.8.0/24 dev enp0s26u1u1.100"
		"route add -net 114.114.114.0/24 dev enp0s26u1u1.200"

6) Test in Ubuntu16.04
		# ping 1.1.1.1
		PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
		64 bytes from 1.1.1.1: icmp_seq=1 ttl=53 time=257 ms
		64 bytes from 1.1.1.1: icmp_seq=2 ttl=53 time=171 ms

		# ping 8.8.8.8
		PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
		64 bytes from 8.8.8.8: icmp_seq=1 ttl=114 time=130 ms
		64 bytes from 8.8.8.8: icmp_seq=2 ttl=114 time=73.0 ms

		# ping 114.114.114.114
		PING 114.114.114.114 (114.114.114.114) 56(84) bytes of data.
		64 bytes from 114.114.114.114: icmp_seq=2 ttl=78 time=103 ms
		64 bytes from 114.114.114.114: icmp_seq=3 ttl=92 time=20.9 ms
		
		# ping6 www.sohu.com -I enp0s26u1u1
		PING www.sohu.com(2408:80f0:4100:4007::4) from 240e:9a:875:27a8:9094:7d7b:6bc9:904a enp0s26u1u1: 56 data bytes
		64 bytes from 2408:80f0:4100:4007::4: icmp_seq=1 ttl=53 time=47.6 ms
		64 bytes from 2408:80f0:4100:4007::4: icmp_seq=2 ttl=53 time=46.7 ms
		64 bytes from 2408:80f0:4100:4007::4: icmp_seq=3 ttl=53 time=49.8 ms

		# ping6 www.sohu.com -I enp0s26u1u1.100
		PING www.sohu.com(2408:80f0:4100:4007::4) from 240e:9a:868:af6d:693a:c829:7dbe:c2d5 enp0s26u1u1.100: 56 data bytes
		64 bytes from 2408:80f0:4100:4007::4: icmp_seq=1 ttl=53 time=72.3 ms
		64 bytes from 2408:80f0:4100:4007::4: icmp_seq=2 ttl=53 time=63.8 ms
		64 bytes from 2408:80f0:4100:4007::4: icmp_seq=3 ttl=53 time=50.8 ms

		# ping6 www.sohu.com -I enp0s26u1u1.200
		PING www.sohu.com(2408:80f0:4100:4007::5) from 240e:9a:874:b759:61f5:109:a46c:fe33 enp0s26u1u1.200: 56 data bytes
		64 bytes from 2408:80f0:4100:4007::5: icmp_seq=1 ttl=53 time=73.7 ms
		64 bytes from 2408:80f0:4100:4007::5: icmp_seq=2 ttl=53 time=54.8 ms
		64 bytes from 2408:80f0:4100:4007::5: icmp_seq=3 ttl=53 time=45.6 ms

7) VLAN for the default PDN
	Since the default PDN is bound to the br-lan, you need to re-bind it to the desired VLAN and re-specify the br-lan address.
	For example, bind to the VLAN 10:
	First, modify the /etc/config/network configure file:

		config interface 'lan'
			option ifname 'usbnet0 hsicnet0 eth0'
			option type 'bridge'
			option bridge_empty '1'
			option proto 'static'
			option ip6assign '60'
			option netmask '255.255.255.0'
			list ipaddr '192.168.1.1'

		config switch
			option name 'switch0'
			option reset '1'
			option enable_vlan '1'

		config interface 'lan1'
			option ifname 'usbnet0.10'
			option type 'bridge'
			option bridge_empty '1'
			option proto 'static'
			option ipaddr '10.171.20.144'
			option netmask '255.255.255.0'
			option ip6assign '60'

	Second, modify the /etc/config/dhcp configure file, then execute "/etc/init.d/network reload" to apply the configuration:
		config dhcp 'lan'
			option interface 'lan'
			option start '100'
			option limit '150'
			option leasetime '2h'
			option dhcpv6 'server'
			option ra 'relay'
			option ndp 'relay'

		config dhcp 'lan1'
			option interface 'lan1'
			option leasetime '2h'
			option dhcpv6 'server'
			option ra 'relay'
			option ndp 'relay'
			option start '111'
			option limit '0'
			list dhcp_option '3,10.171.20.144'
			list dhcp_option '1,255.255.255.0'
			list dhcp_option '6,202.102.213.68,61.132.163.68'
			list dns '240e:46:4088::4088'
			list dns '240e:46:4888::4888'

	Last, bind the virtual LAN to the default PDN:
		"echo 192.168.10.1 > /sys/kernel/mpipe/devices/usbnet0.10/ipaddr"
		"echo fe80::e8c9:89ff:fe4a:3455 > /sys/kernel/mpipe/devices/usbnet0.10/ll6addr"
		"echo 1 > /sys/kernel/mpipe/devices/usbnet0.10/up"
		"echo 1 > /sys/kernel/mpipe/devices/usbnet0.10/up6"
		"echo usbnet0.10 > /sys/kernel/mpipe/devices/ccinet0/combineif"

	The routing configuration in ubuntu is similar to the above step (5).

8) Note
	If you disconnect the usb, you may need to follow the above steps to reconfigure after reconnect.
	If the default PDN is also bound to the VLAN, the ubutun PC can only access the internet via the virtual VLAN network card, while the enumerated real network card will not be able to access the internet.

----------------------------------------

2, MIFI mode
1) Diag
	default PDN:
		"serial_client"
		"AT+ZGDCONT=1,IPV4V6,CMNET"
		"AT+ZGACT=1,1"
	PDN2:
		"AT*ZGDCONT=2,IPV4V6,CMWAP,1"
		"AT+ZGACT=1,2"
	PDN3:
		"AT*ZGDCONT=3,IPV4V6,GPRS,1"
		"AT+ZGACT=1,3"	
	Query the dial results with command "AT+CGDCONT?", you will get some information like this:

		+CGDCONT: 1,"IP","ctnet.mnc011.mcc460.gprs","10.159.180.217",0,0,,,,

		+CGDCONT: 2,"IP","cmwap","10.156.82.62",0,0,0,2,0,0

		+CGDCONT: 3,"IP","cmwap","10.146.8.82",0,0,0,2,0,0

	As listed above , "10.159.180.217" is the IPv4 address of PDN1 and same for the others.
	
	Modify the route configuration, such as:
		"route add -net 114.114.114.0/24 gw 10.146.8.82"
		"route add -net 8.8.8.0/24 gw 10.156.82.62"
		"route add -net 1.1.1.0/24 gw 10.159.180.217"

		# route
		Kernel IP routing table
		Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
		1.1.1.0         10.159.180.217  255.255.255.0   UG    0      0        0 ccinet0
		8.8.8.0         10.156.82.62    255.255.255.0   UG    0      0        0 ccinet1
		114.114.114.0   10.146.8.82     255.255.255.0   UG    0      0        0 ccinet2
		192.168.1.0     *               255.255.255.0   U     0      0        0 br-lan
		192.168.100.0   *               255.255.255.0   U     0      0        0 br-lan2
		192.168.200.0   *               255.255.255.0   U     0      0        0 br-lan3
		
2) Configure /etc/config/network
	Add the following configuration to "/etc/config/network":

		config switch
			option name 'switch0'
			option reset '1'
			option enable_vlan '1'

		config interface 'lan2'
			option ifname 'usbnet0.100'
			option type 'bridge'
			option bridge_empty '1'
			option proto 'static'
			option ipaddr '192.168.100.1'
			option netmask '255.255.255.0'
			option ip6assign '60'

		config interface 'lan3'
			option ifname 'usbnet0.200'
			option type 'bridge'
			option bridge_empty '1'
			option proto 'static'
			option ipaddr '192.168.200.1'
			option netmask '255.255.255.0'
			option ip6assign '60'

	 usbnet0.100 and usbnet0.200 represent VLAN100 and VLAN200.
	 Then execute "/etc/init.d/network reload" to apply the configuration.
	
3) Modify /etc/config/firewall
	The forwarding rules are set as follows:
	
		config zone
			option name             lan
			list   network          'lan'
			option input            ACCEPT
			option output           ACCEPT
			option forward          ACCEPT

		config zone
			option name             wan
			list   network          'wan0'
			list   network          'wan3'
			list   network          'wan4'
			list   network          'wan5'
			list   network          'wan6'
			list   network          'wan7'
			list   network          'wan60'
			list   network          'wan63'
			list   network          'wan64'
			list   network          'wan65'
			list   network          'wan66'
			list   network          'wan67'
			list   network          'wlan'
			list   network          'wlan6'
			option input            REJECT
			option output           ACCEPT
			option forward          REJECT
			option masq             1
			option mtu_fix          1

		config forwarding
			option src              lan
			option dest             wan

		config zone
			option name             lan2
			list   network          'lan2'
			option input            ACCEPT
			option output           ACCEPT
			option forward          ACCEPT

		config zone
			option name             wan_100
			list   network          'wan1'
			list   network          'wan61'
			option input            REJECT
			option output           ACCEPT
			option forward          REJECT
			option masq             1
			option mtu_fix          1

		config forwarding
			option src              lan2
			option dest             wan_100

		config zone
			option name             lan3
			list   network          'lan3'
			option input            ACCEPT
			option output           ACCEPT
			option forward          ACCEPT

		config zone
			option name             wan_200
			list   network          'wan2'
			list   network          'wan62'
			option input            REJECT
			option output           ACCEPT
			option forward          REJECT
			option masq             1
			option mtu_fix          1

		config forwarding
			option src              lan3
			option dest             wan_200

	Then execute "/etc/init.d/firewall reload" to apply the configuration.

4) Configure /etc/config/dhcp
	Add the following configuration to "/etc/config/dhcp":

		config dhcp 'lan2'
			option interface 'lan2'
			option start '100'
			option limit '150'
			option leasetime '2h'
			option dhcpv6 'server'
			option ra 'relay'
			option ndp 'relay'

		config dhcp 'lan3'
			option interface 'lan3'
			option start '100'
			option limit '150'
			option leasetime '2h'
			option dhcpv6 'server'
			option ra 'relay'
			option ndp 'relay'

	Then execute "/etc/init.d/dnsmasq reload" to apply the configuration.
	
5) Configuration in Ubuntu16.04
	Add virtual network card:
		"vconfig add enp0s26u1u1 100"
		"vconfig add enp0s26u1u1 200"

	Get IP address through DHCP:
		"dhcpcd enp0s26u1u1"
		"dhcpcd enp0s26u1u1.100"
		"dhcpcd enp0s26u1u1.200"
		
	# ifconfig
		enp0s26u1u1 Link encap:Ethernet  HWaddr 02:29:f2:b7:fa:81
				  inet addr:192.168.1.134  Bcast:192.168.1.255  Mask:255.255.255.0
				  inet6 addr: 240e:9a:428:44c9:acae:1690:47d3:710c/64 Scope:Global
				  inet6 addr: 240e:9a:428:44c9:29:f2ff:feb7:fa81/64 Scope:Global
				  inet6 addr: fe80::29:f2ff:feb7:fa81/64 Scope:Link
				  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
				  RX packets:13141 errors:0 dropped:0 overruns:0 frame:0
				  TX packets:2393 errors:0 dropped:0 overruns:0 carrier:0
				  collisions:0 txqueuelen:1000
				  RX bytes:1284895 (1.2 MB)  TX bytes:570332 (570.3 KB)

		enp0s26u1u1.100 Link encap:Ethernet  HWaddr 02:29:f2:b7:fa:81
				  inet addr:192.168.100.203  Bcast:192.168.100.255  Mask:255.255.255.0
				  inet6 addr: 240e:9a:417:66b8:29:f2ff:feb7:fa81/64 Scope:Global
				  inet6 addr: 240e:9a:428:44c9:f6e7:c272:3fba:6a7d/64 Scope:Global
				  inet6 addr: fe80::29:f2ff:feb7:fa81/64 Scope:Link
				  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
				  RX packets:3969 errors:0 dropped:0 overruns:0 frame:0
				  TX packets:898 errors:0 dropped:0 overruns:0 carrier:0
				  collisions:0 txqueuelen:1000
				  RX bytes:398354 (398.3 KB)  TX bytes:131123 (131.1 KB)

		enp0s26u1u1.200 Link encap:Ethernet  HWaddr 02:29:f2:b7:fa:81
				  inet addr:192.168.200.203  Bcast:192.168.200.255  Mask:255.255.255.0
				  inet6 addr: 240e:9a:419:2597:29:f2ff:feb7:fa81/64 Scope:Global
				  inet6 addr: 240e:9a:419:2597:6433:4697:bff4:45c9/64 Scope:Global
				  inet6 addr: 240e:9a:428:44c9:29:f2ff:feb7:fa81/64 Scope:Global
				  inet6 addr: fe80::29:f2ff:feb7:fa81/64 Scope:Link
				  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
				  RX packets:3898 errors:0 dropped:0 overruns:0 frame:0
				  TX packets:629 errors:0 dropped:0 overruns:0 carrier:0
				  collisions:0 txqueuelen:1000
				  RX bytes:404558 (404.5 KB)  TX bytes:118583 (118.5 KB)

	Add the IPv4 routing:
		"route add -net 1.1.1.0/24 gw 192.168.1.1"
		"route add -net 8.8.8.0/24 gw 192.168.100.1"
		"route add -net 114.114.114.0/24 gw 192.168.200.1"

		# route
		Kernel IP routing table
		Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
		1.1.1.0         192.168.1.1     255.255.255.0   UG    0      0        0 enp0s26u1u1
		8.8.8.0         192.168.100.1   255.255.255.0   UG    0      0        0 enp0s26u1u1.100
		114.114.114.0   192.168.200.1   255.255.255.0   UG    0      0        0 enp0s26u1u1.200
		192.168.1.0     *               255.255.255.0   U     0      0        0 enp0s26u1u1
		192.168.100.0   *               255.255.255.0   U     0      0        0 enp0s26u1u1.100
		192.168.200.0   *               255.255.255.0   U     0      0        0 enp0s26u1u1.200

6) Test in Ubuntu16.04
		# ping 1.1.1.1
		PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
		64 bytes from 1.1.1.1: icmp_seq=1 ttl=52 time=223 ms
		64 bytes from 1.1.1.1: icmp_seq=2 ttl=52 time=173 ms
		64 bytes from 1.1.1.1: icmp_seq=3 ttl=52 time=169 ms

		# ping 8.8.8.8
		PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
		64 bytes from 8.8.8.8: icmp_seq=2 ttl=113 time=54.7 ms
		64 bytes from 8.8.8.8: icmp_seq=3 ttl=113 time=52.3 ms
		64 bytes from 8.8.8.8: icmp_seq=4 ttl=113 time=53.0 ms

		# ping 114.114.114.114
		PING 114.114.114.114 (114.114.114.114) 56(84) bytes of data.
		64 bytes from 114.114.114.114: icmp_seq=1 ttl=65 time=201 ms
		64 bytes from 114.114.114.114: icmp_seq=2 ttl=86 time=25.0 ms
		64 bytes from 114.114.114.114: icmp_seq=3 ttl=90 time=25.0 ms
		
		# ping6 240e:83:201:3700::4 -I  enp0s26u1u1
		PING 240e:83:201:3700::4(240e:83:201:3700::4) from 240e:9a:428:44c9:acae:1690:47d3:710c enp0s26u1u1: 56 data bytes
		64 bytes from 240e:83:201:3700::4: icmp_seq=1 ttl=57 time=45.2 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=2 ttl=57 time=32.8 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=3 ttl=57 time=32.0 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=4 ttl=57 time=31.2 ms

		# ping6 240e:83:201:3700::4 -I  enp0s26u1u1.100
		PING 240e:83:201:3700::4(240e:83:201:3700::4) from 240e:9a:417:66b8:29:f2ff:feb7:fa81 enp0s26u1u1.100: 56 data bytes
		64 bytes from 240e:83:201:3700::4: icmp_seq=1 ttl=57 time=42.0 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=2 ttl=57 time=33.8 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=3 ttl=57 time=33.8 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=4 ttl=57 time=30.7 ms

		# ping6 240e:83:201:3700::4 -I  enp0s26u1u1.200
		PING 240e:83:201:3700::4(240e:83:201:3700::4) from 240e:9a:419:2597:6433:4697:bff4:45c9 enp0s26u1u1.200: 56 data bytes
		64 bytes from 240e:83:201:3700::4: icmp_seq=1 ttl=57 time=31.9 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=2 ttl=57 time=33.0 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=3 ttl=57 time=35.1 ms
		64 bytes from 240e:83:201:3700::4: icmp_seq=4 ttl=57 time=33.7 ms

7) VLAN for the default PDN
	In MIFI mode, you just need to modify the /etc/config/firewall configure file.
	For example, bind to the VLAN 10:
	Modify the /etc/config/firewall configure file, then execute "/etc/init.d/firewall reload" to apply the configuration.:

		config zone
			option name             lan
			list   network          'lan'
			option input            ACCEPT
			option output           ACCEPT
			option forward          ACCEPT

		config zone
			option name             wan
			list   network          'wan3'
			list   network          'wan4'
			list   network          'wan5'
			list   network          'wan6'
			list   network          'wan7'
			list   network          'wan63'
			list   network          'wan64'
			list   network          'wan65'
			list   network          'wan66'
			list   network          'wan67'
			list   network          'wlan'
			list   network          'wlan6'
			option input            REJECT
			option output           ACCEPT
			option forward          REJECT
			option masq             1
			option mtu_fix          1

		config forwarding
			option src              lan
			option dest             wan

		config zone
			option name             lan1
			list   network          'lan1'
			option input            ACCEPT
			option output           ACCEPT
			option forward          ACCEPT

		config zone
			option name             wan_10
			list   network          'wan0'
			list   network          'wan60'
			option input            REJECT
			option output           ACCEPT
			option forward          REJECT
			option masq             1
			option mtu_fix          1

		config forwarding
			option src              lan1
			option dest             wan_10

	The routing configuration in ubuntu is similar to the above step (5) and module is similar to the above step (1).

8) Note
	If you disconnect the usb, you may need to follow the above steps to reconfigure after reconnect.
	If the default PDN is also bound to the VLAN, the ubutun PC can only access the internet via the virtual VLAN network card, while the enumerated real network card will not be able to access the internet.
