[arch-general] USB 3G Modem: no remote host reachable, while connection (seems to) establish correctly

[Sebastian Lipp]

Hey there!

I've got a problem with my Huawei E220 (not entirely sure about this) 3G modem
stick. It used to work for several days without any issues but someone closed
my laptop's lid so that it slept away and since I can't reach any remote
machine.

Everything seems to be normal, even the "defaulting to 10.64.64.64" message by
pppd is in the logs from times it worked... I played around with the routes
but was not able to solve my problem.

pppd connects successfully and sets the routes and DNS servers. Interesting is
that I don't get answers to any ping. Even the DNS servers don't answer but my
machine resolves domain names. Putting for example googles DNS server 8.8.8.8
into /etc/resov.conf doesn't help.

I even tried to kick wvdial by following
<https://wiki.archlinux.org/index.php/3G_and_GPRS_modems_with_pppd_alone>.
Everything seems to work identically. The problem is also the same.

I dont't know how to solve this problem. Perhaps someone here can help me.
Below are those informations I thought would be helpful. I will happily
provide any further information that might help.

Thanks in advance.

[bacuh at eee ~]$ dmesg
[12585.668857] usb 1-1: new high-speed USB device number 9 using ehci_hcd
[12585.809389] option 1-1:1.0: GSM modem (1-port) converter detected
[12585.809795] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
[12585.810369] option 1-1:1.1: GSM modem (1-port) converter detected
[12585.810645] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[12585.811697] scsi17 : usb-storage 1-1:1.2
[12585.813594] scsi18 : usb-storage 1-1:1.3
[12586.817410] scsi 17:0:0:0: CD-ROM            HUAWEI   Mass Storage     2.31 PQ: 0 ANSI: 2
[12586.822239] scsi 18:0:0:0: Direct-Access     HUAWEI   MMC Storage      2.31 PQ: 0 ANSI: 2
[12586.828280] sr0: scsi-1 drive
[12586.835202] sr 17:0:0:0: Attached scsi CD-ROM sr0
[12586.837277] sd 18:0:0:0: [sdb] Attached SCSI removable disk

[bacuh at eee ~]$ cat /etc/wvdial.conf
[Dialer aldi_mf]
Modem = /dev/ttyUSB0
#Init1 = AT+CPIN=XXXX # not used anymore
Init2 = ATZ
Init3 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init4 = AT+CGDCONT=1,"IP","internet.eplus.de"
Stupid Mode = 1
Modem Type = Analog Modem
Phone = *99***1#
ISDN = 0
Username = eplus
Dial Command = ATDT
Password = gprs
Baud = 460800

[bacuh at eee ~]$ sudo wvdial aldi_mf 
[sudo] password for bacuh: 
--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Sending: AT+CGDCONT=1,"IP","internet.eplus.de"
AT+CGDCONT=1,"IP","internet.eplus.de"
OK
--> Modem initialized.
--> Sending: ATDT*99***1#
--> Waiting for carrier.
ATDT*99***1#
CONNECT
--> Carrier detected.  Starting PPP immediately.
--> Starting pppd at Tue Nov 20 15:37:04 2012
--> Pid of pppd: 13809
--> Using interface ppp0
--> local  IP address 10.140.52.61
--> remote IP address 10.64.64.64
--> primary   DNS address 212.23.115.132
--> secondary DNS address 212.23.115.148

[bacuh at eee ~]$ sudo tail /var/log/messages.log
Nov 20 15:37:04 localhost pppd[13809]: pppd 2.4.5 started by bacuh, uid 0
Nov 20 15:37:04 localhost pppd[13809]: Using interface ppp0
Nov 20 15:37:04 localhost pppd[13809]: Connect: ppp0 <--> /dev/ttyUSB0
Nov 20 15:37:04 localhost pppd[13809]: CHAP authentication succeeded
Nov 20 15:37:04 localhost pppd[13809]: CHAP authentication succeeded
Nov 20 15:37:06 localhost pppd[13809]: Could not determine remote IP address:
defaulting to 10.64.64.64
Nov 20 15:37:06 localhost pppd[13809]: local  IP address 10.140.52.61
Nov 20 15:37:06 localhost pppd[13809]: remote IP address 10.64.64.64
Nov 20 15:37:06 localhost pppd[13809]: primary   DNS address 212.23.115.132
Nov 20 15:37:06 localhost pppd[13809]: secondary DNS address 212.23.115.148

[bacuh at eee ~]$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 ppp0
10.64.64.64     0.0.0.0         255.255.255.255 UH    0      0        0 ppp0

[bacuh at eee ~]$ ping google.de
PING google.de (173.194.34.95) 56(84) bytes of data.
^C
--- google.de ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 3999ms

[bacuh at eee ~]$ cat /etc/resolv.conf
nameserver 212.23.115.132
nameserver 212.23.115.148

-- 
basti