4G-with IP but no internet/ping [SOLVED]

Installing and Using OpenWrt
1

Hello,
my setup is a GL-x750v2 with a german SIMcard inside trying to work in Greece.

here some outputs:

root@OpenWrt:~# uqmi -d /dev/cdc-wdm0 --get-serving-system
{
        "registration": "registered",
        "plmn_mcc": 202,
        "plmn_mnc": 1,
        "plmn_description": "\u0016\u0001",
        "roaming": true
}
root@OpenWrt:~# uqmi -d /dev/cdc-wdm0 --get-signal-info
{
        "type": "lte",
        "rssi": -63,
        "rsrq": -10,
        "rsrp": -93,
        "snr": 68
}

here the ip a

root@OpenWrt:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br-lan state UP qlen 1000
    link/ether 94:83:c4:14:a7:37 brd ff:ff:ff:ff:ff:ff
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN qlen 1000
    link/ether 94:83:c4:14:a7:36 brd ff:ff:ff:ff:ff:ff
4: wwan0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN qlen 1000
    link/[65534]
    inet 10.184.48.80/27 brd 10.184.48.95 scope global wwan0
       valid_lft forever preferred_lft forever
    inet6 fe80::db83:aefb:9788:2899/64 scope link flags 800
       valid_lft forever preferred_lft forever
5: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 94:83:c4:14:a7:38 brd ff:ff:ff:ff:ff:ff
7: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 94:83:c4:14:a7:37 brd ff:ff:ff:ff:ff:ff
    inet 192.168.66.1/24 brd 192.168.66.255 scope global br-lan
       valid_lft forever preferred_lft forever
    inet6 fd0c:2683:6629::1/60 scope global noprefixroute
       valid_lft forever preferred_lft forever
    inet6 fe80::9683:c4ff:fe14:a737/64 scope link
       valid_lft forever preferred_lft forever
15: wlan1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 94:83:c4:14:a7:38 brd ff:ff:ff:ff:ff:ff
    inet 192.168.53.206/24 brd 192.168.53.255 scope global wlan1
       valid_lft forever preferred_lft forever
    inet6 fe80::9683:c4ff:fe14:a738/64 scope link
       valid_lft forever preferred_lft forever

I know the wifi should be off, I did try this check here:

root@OpenWrt:~# uqmi -d /dev/cdc-wdm0 --get-serving-system
{
        "registration": "registered",
        "plmn_mcc": 202,
        "plmn_mnc": 1,
        "plmn_description": "\u0016\u0001",
        "roaming": true
}
root@OpenWrt:~# ifconfig
br-lan    Link encap:Ethernet  HWaddr 94:83:C4:14:A7:37
          inet addr:192.168.66.1  Bcast:192.168.66.255  Mask:255.255.255.0
          inet6 addr: fd0c:2683:6629::1/60 Scope:Global
          inet6 addr: fe80::9683:c4ff:fe14:a737/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:137805 errors:0 dropped:0 overruns:0 frame:0
          TX packets:231487 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:19381879 (18.4 MiB)  TX bytes:276701383 (263.8 MiB)

eth0      Link encap:Ethernet  HWaddr 94:83:C4:14:A7:37
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:137805 errors:0 dropped:0 overruns:0 frame:0
          TX packets:231493 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:21311149 (20.3 MiB)  TX bytes:276701157 (263.8 MiB)
          Interrupt:5

eth1      Link encap:Ethernet  HWaddr 94:83:C4:14:A7:36
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:4

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:2084 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2084 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:172986 (168.9 KiB)  TX bytes:172986 (168.9 KiB)

wireguard Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:192.168.33.9  P-t-P:192.168.33.9  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP  MTU:1420  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:131 errors:0 dropped:6 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:19388 (18.9 KiB)

wlan1     Link encap:Ethernet  HWaddr 94:83:C4:14:A7:38
          inet6 addr: fe80::9683:c4ff:fe14:a738/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11354 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14111 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1614857 (1.5 MiB)  TX bytes:5583511 (5.3 MiB)

wwan0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          ... outdated ... gets an IP now

root@OpenWrt:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
ping: sendto: Network unreachable

What can be the problem/reason for this?

4G has to be in wwan-firewall zone,
wifi0 has to be "off" and/or "LAN-firewall zone"

since the uqmi command shows it is registered, i assume the connection is OK ?! and I need to find the problem at the router setting?

Thanks for your help

2

another hint that might be the cause?!

root@OpenWrt:~# ip route
10.153.26.64/27 dev wwan0 scope link  src 10.153.26.80
89.247.195.205 via 10.153.26.81 dev wwan0
192.168.66.0/24 dev br-lan scope link  src 192.168.66.1

switched back to WIFI as internet connection (wifi connects to a smartphone hotspot)

root@OpenWrt:~# ip route
default via 192.168.53.35 dev wlan1  src 192.168.53.206
192.168.53.0/24 dev wlan1 scope link  src 192.168.53.206
192.168.66.0/24 dev br-lan scope link  src 192.168.66.1

missing default route above thru the 4G interface ?! but this default route should be generated automatically? how will it be triggered or prevented?

3

here the AT command-outputs:

root@OpenWrt:~# picocom -b 115200 -r -l /dev/ttyUSB3
picocom v3.1

port is        : /dev/ttyUSB3
flowcontrol    : none
baudrate is    : 115200
parity is      : none
databits are   : 8
stopbits are   : 1
escape is      : C-a
local echo is  : no
noinit is      : no
noreset is     : yes
hangup is      : no
nolock is      : yes
send_cmd is    : sz -vv
receive_cmd is : rz -vv -E
imap is        :
omap is        :
emap is        : crcrlf,delbs,
logfile is     : none
initstring     : none
exit_after is  : not set
exit is        : no

!! Settings mismatch !! Type [C-a] [C-v] to see actual port settings
Type [C-a] [C-h] to see available commands
Terminal ready
AT+COPS?
+COPS: 0,0,"COSMOTE 1&1",7

OK
AT+QSPN
+QSPN: "COSMOTE","COSMOTE","1&1",0,"20201"

OK
AT+CGDCONT?
+CGDCONT: 1,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 2,"IPV4V6","ims","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 3,"IPV4V6","sos","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1

OK
AT+CGACT?
+CGACT: 1,1
+CGACT: 2,0
+CGACT: 3,0

OK
AT+CPIN?
+CPIN: READY

OK
AT+CGREG?
+CGREG: 0,5

OK
4

default route should be provided by cosmote via wwan0 and some nexthop

you may need a /etc/init.d/network restart or even a reboot

but maybe communication with cosmote is confusing because

  1. CGDCONT has no APN
  2. CGDCONT has IPV4V6

You could try something like (note 'internet' is cosmote APN)

AT+CGDCONT=1,"IPV4","internet","0.0.0.0",0,0,0,0
AT+CGDCONT=2,"IPV4","ims","0.0.0.0",0,0,0,0
AT+CGDCONT=3,"IPV4","sos","0.0.0.0",0,0,0,1

to avoid these ...

Even openwrt and uqmi config may be confused
(where you use pdp-type=ipv4 and apn internet IIRC)

Good luck

5

Reboot with no Hotspot active helped.

now i get this:

root@OpenWrt:~# ip route
default via 10.142.133.77/30 dev wwan0  src 10.142.133.78
192.168.53.0/24 dev wlan1 scope link  src 192.168.53.206
192.168.66.0/24 dev br-lan scope link  src 192.168.66.1

but there is no ping possible/outgoing.
wwan0 is in the red firewall zone.
what/where could be the problem?

6

and you know for a fact the ISP isn't blocking ping ?

7

correct. calling webpages does not work either

8

here is my firewall rule for the 4G interface

image
image1125×272 19.5 KB

also could you ping the gateway IP from the provider side. in my case it is like this

root@OpenWrtNeohori:~# ip route
default via 10.67.124.49 dev wwan0  **src 10.67.124.50**
10.67.124.48/30 dev wwan0 scope link  src 10.67.124.50
192.168.5.0/24 dev br-lan scope link  src 192.168.5.1
192.168.178.0/24 dev eth1 scope link  src 192.168.178.5
root@OpenWrt:~# ping 10.67.124.50
PING 10.67.124.50 (10.67.124.50): 56 data bytes
64 bytes from 10.67.124.50: seq=0 ttl=64 time=0.275 ms
^C
--- 10.67.124.50 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 0.275/0.275/0.275 ms
root@OpenWrt:~#

if it replies, then it is a matter of firewall settings.Cosmote replies on those IPs

please check your firewall settings and post your settings here.

9

works :slight_smile: thanks, the problem was:
I still had wifi at the red.zone firewall additional to the 4g this caused the trouble

10

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