Article 5D3BT Problem with wifi extender, cannot connect to internet

Problem with wifi extender, cannot connect to internet

by
kasiatutej
from LinuxQuestions.org on (#5D3BT)
Hi,
I try to connect to internet with tp-link wifi extender(RE305), but when I get IP, I cannot connect outside router, firefox doesn't work, ping doesn't work...
I'm connected to isp with MiRouter, to which I connect with pci Wireless-AC 9260, and everything works ok.
But, I have to move my desktop to another room, where wifi connection is weak, so I put in the middle wifi extender.
All devices can establish connection with that extender: smartphone, tablet, windows laptops.
But I cannot connect to internet from Debian(Buster, current, 4.19.0-13-amd64).
I shared logs(syslog) from connecting to router directly:
https://drive.google.com/file/d/1kJ8...ew?usp=sharing
and when I connect with extender:
https://drive.google.com/file/d/1WFw...ew?usp=sharing
No error messages, logs looks rather ok.
But when I ping using extender I get:
$ ping google.pl
PING google.pl (172.217.20.195) 56(84) bytes of data.
From XiaoQiang (192.168.31.1) icmp_seq=1 Destination Port Unreachable
From XiaoQiang (192.168.31.1) icmp_seq=2 Destination Port Unreachable
^C
--- google.pl ping statistics ---
2 packets transmitted, 0 received, +2 errors, 100% packet loss, time 1000ms

$ traceroute google.pl
traceroute to google.pl (172.217.20.195), 30 hops max, 60 byte packets
1 XiaoQiang (192.168.31.1) 1.911 ms * *
2 * * *
3 * * *
4 * * *
5 * * *
6 * * *
7 * * XiaoQiang (192.168.31.1) 2.985 ms

When I connect direct:
$ ping google.pl
PING google.pl (172.217.20.195) 56(84) bytes of data.
64 bytes from waw02s08-in-f3.1e100.net (172.217.20.195): icmp_seq=1 ttl=119 time=2.26 ms

$ traceroute google.pl
traceroute to google.pl (172.217.20.195), 30 hops max, 60 byte packets
1 XiaoQiang (192.168.31.1) 1.006 ms 2.236 ms 2.277 ms
2 * * *
3 10.11.24.1 (10.11.24.1) 2.917 ms 2.908 ms 2.888 ms
4 host-80-238-116-7.jmdi.pl (80.238.116.7) 3.167 ms 3.156 ms 3.151 ms
5 war-b1-link.telia.net (62.115.175.208) 4.429 ms 4.879 ms 4.862 ms
6 google-ic-314672-war-b1.c.telia.net (62.115.61.22) 3.703 ms 74.125.51.150 (74.125.51.150) 2.735 ms 2.865 ms
7 * * 108.170.250.209 (108.170.250.209) 4.761 ms
8 216.239.40.42 (216.239.40.42) 3.148 ms 216.239.40.212 (216.239.40.212) 5.280 ms 108.170.234.244 (108.170.234.244) 3.659 ms
9 waw02s08-in-f195.1e100.net (172.217.20.195) 3.966 ms 3.937 ms 216.239.41.171 (216.239.41.171) 3.573 ms

network(extender):
# /sbin/ifconfig
...
wlp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.31.101 netmask 255.255.255.0 broadcast 192.168.31.255
inet6 fe80::ced9:acff:fe3c:c981 prefixlen 64 scopeid 0x20<link>
ether cc:d9:ac:3c:c9:81 txqueuelen 1000 (Ethernet)
RX packets 1254690 bytes 1182898412 (1.1 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 535338 bytes 121894689 (116.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

# /sbin/iwconfig
enp5s2 no wireless extensions.

docker0 no wireless extensions.

enp2s0 no wireless extensions.

wlp3s0 IEEE 802.11 ESSID:"kasia-tutej_EXT"
Mode:Managed Frequency:5.18 GHz Access Point: E4:C3:2A:8E:C1:03
Bit Rate=585 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=66/70 Signal level=-44 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:2 Missed beacon:0

lo no wireless extensions.

[config when direct connection to router]
# /sbin/iwconfig
enp5s2 no wireless extensions.

docker0 no wireless extensions.

enp2s0 no wireless extensions.

wlp3s0 IEEE 802.11 ESSID:"kasia-tutej"
Mode:Managed Frequency:5.18 GHz Access Point: 8C:53:C3:8A:0E:90
Bit Rate=526.6 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=70/70 Signal level=-37 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:36 Missed beacon:0

lo no wireless extensions.

# /sbin/ifconfig
...
wlp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.31.142 netmask 255.255.255.0 broadcast 192.168.31.255
inet6 fe80::ced9:acff:fe3c:c981 prefixlen 64 scopeid 0x20<link>
ether cc:d9:ac:3c:c9:81 txqueuelen 1000 (Ethernet)
RX packets 1253543 bytes 1182692569 (1.1 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 534950 bytes 121832343 (116.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

I'm stuck, little googled, but cannot find solution.
What to include to better diagnose the problem?
Thanks in advance.latest?d=yIl2AUoC8zA latest?i=ZKgCZF1cvKI:hK7Yop-u-7Q:F7zBnMy latest?i=ZKgCZF1cvKI:hK7Yop-u-7Q:V_sGLiP latest?d=qj6IDK7rITs latest?i=ZKgCZF1cvKI:hK7Yop-u-7Q:gIN9vFwZKgCZF1cvKI
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