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USB dongle connected but no Internet

I have a usb dongle K3806-Z (ZTE).

When attaching the USB stick the network manager recognizes it and the connection is successful, with IP, default gateway and DNS servers obtained automatically by DHCP.

Everything seems normal however I do not have internet access.

I'm using Fedora 26 with cinammon desktop.

The USB dongle it's OK (I tested in a Windows 7 machine) and a shutdown the firewall service.

Thanks for any help.

I leave here a result of the dmesg command:

New USB device strings: Mfr=2, Product=1, SerialNumber=3
[   95.500805] usb 1-1.2: Product: K3806-Z
[   95.500807] usb 1-1.2: Manufacturer: Vodafone (ZTE)
[   95.500809] usb 1-1.2: SerialNumber: F2791AD3456DFEB1637034872EDC5D2669F3A7F7
[   95.545730] usb-storage 1-1.2:1.0: USB Mass Storage device detected
[   95.545814] scsi host6: usb-storage 1-1.2:1.0
[   95.545898] usbcore: registered new interface driver usb-storage
[   95.548194] usbcore: registered new interface driver uas
[   96.274174] usb 1-1.2: USB disconnect, device number 8
[  102.589767] usb 1-1.2: new high-speed USB device number 9 using ehci-pci
[  102.669101] usb 1-1.2: New USB device found, idVendor=19d2, idProduct=1015
[  102.669103] usb 1-1.2: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[  102.669104] usb 1-1.2: Product: K3806-Z
[  102.669105] usb 1-1.2: Manufacturer: Vodafone (ZTE)
[  102.669106] usb 1-1.2: SerialNumber: F2791AD3456DFEB1637034872EDC5D2669F3A7F7
[  102.669944] usb-storage 1-1.2:1.7: USB Mass Storage device detected
[  102.670046] scsi host6: usb-storage 1-1.2:1.7
[  102.693503] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[  102.693851] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[  102.694470] usbcore: registered new interface driver cdc_acm
[  102.694472] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[  102.702055] cdc_ether 1-1.2:1.5 wwan0: register 'cdc_ether' at usb-0000:00:1a.0-1.2, Mobile Broadband Network Device, 02:6d:fe:b1:63:70
[  102.702089] usbcore: registered new interface driver cdc_ether
[  102.706544] cdc_ether 1-1.2:1.5 wwp0s26u1u2i5: renamed from wwan0
[  103.678590] scsi 6:0:0:0: CD-ROM            Vodafone USB SCSI CD-ROM  0001 PQ: 0 ANSI: 0
[  103.678960] scsi 6:0:0:1: Direct-Access     Vodafone Storage          0001 PQ: 0 ANSI: 0
[  103.680088] sr 6:0:0:0: [sr0] scsi3-mmc drive: 0x/0x caddy
[  103.680090] cdrom: Uniform CD-ROM driver Revision: 3.20
[  103.680246] sr 6:0:0:0: Attached scsi CD-ROM sr0
[  103.680425] sr 6:0:0:0: Attached scsi generic sg2 type 5
[  103.680638] sd 6:0:0:1: Attached scsi generic sg3 type 0
[  103.683096] sd 6:0:0:1: [sdc] Attached SCSI removable disk
[  113.685666] cdc_ether 1-1.2:1.5 wwp0s26u1u2i5: kevent 12 may have been dropped
[  113.685898] cdc_ether 1-1.2:1.5 wwp0s26u1u2i5: kevent 12 may have been dropped
[  113.686223] cdc_ether 1-1.2:1.5 wwp0s26u1u2i5: kevent 12 may have been dropped
[  134.087151] r8169 0000:02:00.0 enp2s0: link down
[  197.710580] IPv6: ADDRCONF(NETDEV_UP): wwp0s26u1u2i5: link is not ready
[  319.199533] cdc_ether 1-1.2:1.5 wwp0s26u1u2i5: kevent 12 may have been dropped
[  319.199544] cdc_ether 1-1.2:1.5 wwp0s26u1u2i5: kevent 12 may have been dropped
[  319.199771] cdc_ether 1-1.2:1.5 wwp0s26u1u2i5: kevent 12 may have been dropped
[  319.200079] cdc_ether 1-1.2:1.5 wwp0s26u1u2i5: kevent 11 may have been dropped
[  450.377105] r8169 0000:02:00.0 enp2s0: link up
[  846.354441] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.