I agree, as soon as there is an IP assigned means that some packets were travelling between me and provider. And really I see some number of packets received (usually between 4-8).
Here are some logs to show better the situation:
root@LEDE:~# cat /sys/class/net/wwan0/qmi/raw_ip
Y
root@LEDE:~# uqmi -d /dev/cdc-wdm0 --get-signal-info
{
"type": "lte",
"rssi": -79,
"rsrq": -13,
"rsrp": -106,
"snr": 26
}
root@LEDE:~# uqmi -d /dev/cdc-wdm0 --get-data-status
"connected"
root@LEDE:~# uqmi -d /dev/cdc-wdm0 --get-current-settings
{
"pdp-type": "ipv4",
"ip-family": "ipv4",
"mtu": 1500,
"ipv4": {
"ip": "10.0.1.100",
"dns1": "217.200.200.42",
"dns2": "213.230.155.10",
"gateway": "10.0.1.101",
"subnet": "255.255.255.248"
},
"ipv6": {
},
"domain-names": {
}
}
root@LEDE:~# udhcpc -i wwan0
udhcpc: started, v1.28.4
udhcpc: sending discover
udhcpc: sending select for 10.0.1.100
udhcpc: lease of 10.0.1.100 obtained, lease time 7200
udhcpc: ifconfig wwan0 10.0.1.100 netmask 255.255.255.248 broadcast +
udhcpc: setting default routers: 10.0.1.101
root@LEDE:~# ifconfig -a
...
wwan0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:10.0.1.100 P-t-P:10.0.1.100 Mask:255.255.255.248
inet6 addr: fe80::7fdf:4cef:f7dd:ac00/64 Scope:Link
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:2265 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1860 (1.8 KiB) TX bytes:156718 (153.0 KiB)
root@LEDE:~# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 10.0.1.101 0.0.0.0 UG 0 0 0 wwan0
10.0.1.96 0.0.0.0 255.255.255.248 U 0 0 0 wwan0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br-lan
root@LEDE:~# ping -I wwan0 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
^C
--- 8.8.8.8 ping statistics ---
5 packets transmitted, 0 packets received, 100% packet loss