Problem: no internet on the terminal

Hello there. Internet just stop working in my terminal, for all users, for all environments (including alt+ctrl+F2).

ping 8.8.8.8 lost all packages...
ping someweb.com lost all packages...
WhoIs does not work...
ping localhost works fine.

But, the apps (browser, telegram etc etc) works fine.

My OS is Slackware 15.0.

This is the ifconfig result:
Code:$ ifconfig
eth0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 54:ee:75:11:6c:a1 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 20 memory 0xf2500000-f2520000

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 96 bytes 8832 (8.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 96 bytes 8832 (8.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.19.134.187 netmask 255.255.248.0 broadcast 172.19.135.255
inet6 fe80::635e:10f5:578e:4bc7 prefixlen 64 scopeid 0x20<link>
ether e8:2a:ea:19:b4:d7 txqueuelen 1000 (Ethernet)
RX packets 5854 bytes 5029737 (4.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3714 bytes 833866 (814.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0Thanks you.

Update:
I have tried with:
Code:$ unset http_proxy
$ unset https_proxy
$ unset ftp_proxybut the problem still persist.

wget does not work as well.