It seems that i can ping google DNS to its IPv6 address 2001:4860:4860::8888
but i can't ping it's IPv4 address 8.8.8.8
luka@luka-Inspiron-3458:~$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
173 packets transmitted, 0 received, 100% packet loss, time 173374ms
luka@luka-Inspiron-3458:~$ ping6 2001:4860:4860::8888
PING 2001:4860:4860::8888(2001:4860:4860::8888) 56 data bytes
64 bytes from 2001:4860:4860::8888: icmp_seq=1 ttl=48 time=286 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=2 ttl=48 time=60.6 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=3 ttl=48 time=61.3 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=4 ttl=48 time=60.8 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=5 ttl=48 time=60.9 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=6 ttl=48 time=60.2 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=7 ttl=48 time=59.5 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=8 ttl=48 time=60.8 ms
^C
--- 2001:4860:4860::8888 ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7010ms
rtt min/avg/max/mdev = 59.573/88.846/286.406/74.672 ms
i have a really slow internet conection in this laptop (i'm using Ubuntu 16.04), pages take literal hours to load and sometimes it ends with "Site Can't be Reached", and i believe it's because of this issue. I also can't ping my router's IP which is 192.168.1.254.
Every other PC in my house uses the internet with no problem, even the same laptop, when i boot on windows, connects without any issues.
output of cat /etc/network/interfaces
luka@luka-Inspiron-3458:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
output of ifconfig:
eth0 Link encap:Ethernet HWaddr 20:47:47:29:b9:98
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)
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:11920 errors:0 dropped:0 overruns:0 frame:0
TX packets:11920 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:778490 (778.4 KB) TX bytes:778490 (778.4 KB)
wlan0 Link encap:Ethernet HWaddr b4:6d:83:9b:1d:6f
inet addr:192.168.1.75 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: 2806:10a6:5:177c:b66d:83ff:fe9b:1d6f/64 Scope:Global
inet6 addr: 2806:10a6:5:177c:c61:441f:5f13:8edf/64 Scope:Global
inet6 addr: fe80::b66d:83ff:fe9b:1d6f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9990 errors:0 dropped:0 overruns:0 frame:0
TX packets:11766 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:586026 (586.0 KB) TX bytes:1298218 (1.2 MB)
output iwconfig:
lo no wireless extensions.
wlan0 IEEE 802.11abgn ESSID:"INFINITUM0368"
Mode:Managed Frequency:2.462 GHz Access Point: E4:3E:D7:3B:1B:42
Bit Rate=72.2 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=69/70 Signal level=-41 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:521 Missed beacon:0
eth0 no wireless extensions.
output of cat /etc/resolv.conf
luka@luka-Inspiron-3458:/etc/init.d$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
search rga.ip
output route -n
luka@luka-Inspiron-3458:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.254 0.0.0.0 UG 600 0 0 wlan0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 wlan0
172.16.180.0 0.0.0.0 255.255.255.0 U 0 0 0 vmnet0
172.16.191.0 0.0.0.0 255.255.255.0 U 0 0 0 vmnet8
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 vmnet1
192.168.1.0 0.0.0.0 255.255.255.0 U 600 0 0 wlan0
output from route -6 -n
luka@luka-Inspiron-3458:~$ route -6 -n
Kernel IPv6 routing table
Destination Next Hop Flag Met Ref Use If
2806:10a6:5:177c::/64 :: Ue 256 0 0 wlan0
fe80::/64 :: U 256 0 0 vmnet0
fe80::/64 :: U 256 0 0 vmnet1
fe80::/64 :: U 256 0 0 vmnet8
fe80::/64 :: U 256 4 271 wlan0
::/0 fe80::1 UG 600 3 9 wlan0
::/0 :: !n -1 1 2291 lo
::1/128 :: Un 0 5 19 lo
2806:10a6:5:177c:8cb0:eddf:714e:872f/128 :: Un 0 2 179 lo
2806:10a6:5:177c:e3a2:3a53:f36d:2567/128 :: Un 0 1 0 lo
fe80::250:56ff:fec0:0/128 :: Un 0 1 0 lo
fe80::250:56ff:fec0:1/128 :: Un 0 1 0 lo
fe80::250:56ff:fec0:8/128 :: Un 0 1 0 lo
fe80::e97b:d589:3ece:1f53/128 :: Un 0 2 299 lo
ff00::/8 :: U 256 4 69 vmnet0
ff00::/8 :: U 256 4 61 vmnet1
ff00::/8 :: U 256 4 61 vmnet8
ff00::/8 :: U 256 4 221 wlan0
::/0 :: !n -1 1 2291 lo
output from ip neigh
luka@luka-Inspiron-3458:~$ ip neigh
192.168.1.254 dev wlan0 lladdr e4:3e:d7:3b:1b:42 STALE
fe80::1 dev wlan0 lladdr e4:3e:d7:3b:1b:42 router STALE
IPv4 tab on Edit Connections…
Thanks everybody for your help.
Best Answer
Based on the information provided we can see that there is some compatibility problem between your Ubuntu 16.04 machine and your router. That somehow breaks IPv4 connectivity.
However given that you appear to have working IPv6 connectivity you can use that and NAT64 to access IPv4-only sites as well.
The steps to achieve that setup are as follows:
Edit Connections...Edit...IPv4 SettingstabMethodfromAutomatictoDisabledIPv6 SettingstabMethodfromAutomatictoAutomatic, addresses onlyDNS serversfield with 2-3 DNS64 addressesThe above changes will only apply to the chosen SSID, which is the desired behavior as you likely only have the problem when connected to that specific router.
You will get the best latency if you find DNS64 addresses provided by your own ISP. But otherwise these two sites TREX and go6 Lab have 6 different public DNS64 addresses that you can use.