No internet connection on ubuntu virtual server

[kdurov]

Hi.
I used wgcf on my local desktop pc to generate a conf file. There's not any problem connecting warp plus with official wireguard app on my iPhone and Windows 10 PC.
Then I uploaded the profile conf to my virtual private server. When I tried to connect on the server, everything seemed to be fine at first but then I found out that I couldn't access internet any more. Ping, nslookup etc. all stopped working.

Here're the output of sudo wg-quick up wg0 and sudo wg

wg-quick up wg0
[#] ip link add wg0 type wireguard
[#] wg setconf wg0 /dev/fd/63
[#] ip -4 address add xx.xx…/32 dev wg0
[#] ip -6 address add xxxx:xxxx…/128 dev wg0
[#] ip link set mtu 1420 up dev wg0
[#] resolvconf -a tun.wg0 -m 0 -x
[#] wg set wg0 fwmark 51820
[#] ip -6 route add ::/0 dev wg0 table 51820
[#] ip -6 rule add not fwmark 51820 table 51820
[#] ip -6 rule add table main suppress_prefixlength 0
[#] ip6tables-restore -n
[#] ip -4 route add 0.0.0.0/0 dev wg0 table 51820
[#] ip -4 rule add not fwmark 51820 table 51820
[#] ip -4 rule add table main suppress_prefixlength 0
[#] sysctl -q net.ipv4.conf.all.src_valid_mark=1
[#] iptables-restore -n

sudo wg
interface: wg0
  public key: [private key]
  private key: (hidden)
  listening port: 42533
  fwmark: 0xca6c

peer: [public key]
  endpoint: [2606:4700:d0::a29f:c001]:2408
  allowed ips: 0.0.0.0/0, ::/0
  latest handshake: 52 seconds ago
  transfer: 22.74 KiB received, 99.47 KiB sent


ifconfig 
wg0: flags=209<UP,POINTOPOINT,RUNNING,NOARP>  mtu 1420
        inet 172.16.0.2  netmask 255.255.255.255  destination 172.16.0.2
        inet6 fd01:5ca1:ab1e:8a78:95f2:4221:fadd:327c  prefixlen 128  scopeid 0x0<global>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 356  bytes 26348 (26.3 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1221  bytes 116044 (116.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

but wg0 interface is not shown in routing table

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         [gateway]    0.0.0.0         UG    100    0        0 ens3
[ip]    0.0.0.0         255.255.254.0   U     0      0        0 ens3
169.254.169.254 [gateway]    255.255.255.255 UGH   100    0        0 ens3

Internet connection is lost when wg0 is up. If I turn wg0 off, everything is back to normal.

Does anybody has any idea what's going wrong here? Can someone help me out?
Thanks in advance.

[ViRb3]

I just tested on Xubuntu 20.04 and internet via Warp works great. This seems to be an issue with your Linux/WireGuard configuration, which I'm afraid I can't support. I can only give some basic troubleshooting ideas:

• Try another WireGuard VPN profile, e.g. self-hosted, NordVPN, Mullvad
• Change the DNS inside the WireGuard profile from 1.1.1.1 to something else
• Try on another Linux installation, preferrably a clean one
• Try on Android/Windows, via official WireGuard app

EDIT, for reference:

root@ubuntu:~# wg-quick up wgcf-profile 
[#] ip link add wgcf-profile type wireguard
[#] wg setconf wgcf-profile /dev/fd/63
[#] ip -4 address add [REDACTED]/32 dev wgcf-profile
[#] ip -6 address add [REDACTED]/128 dev wgcf-profile
[#] ip link set mtu 1420 up dev wgcf-profile
[#] resolvconf -a tun.wgcf-profile -m 0 -x
[#] wg set wgcf-profile fwmark 51820
[#] ip -6 route add ::/0 dev wgcf-profile table 51820
[#] ip -6 rule add not fwmark 51820 table 51820
[#] ip -6 rule add table main suppress_prefixlength 0
[#] ip6tables-restore -n
[#] ip -4 route add 0.0.0.0/0 dev wgcf-profile table 51820
[#] ip -4 rule add not fwmark 51820 table 51820
[#] ip -4 rule add table main suppress_prefixlength 0
[#] sysctl -q net.ipv4.conf.all.src_valid_mark=1
[#] iptables-restore -n

root@ubuntu:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=121 time=79.0 ms

root@ubuntu:~# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet [REDACTED]  netmask 255.255.255.0  broadcast [REDACTED] 
        inet6 [REDACTED]   prefixlen 64  scopeid 0x20<link>
        ether [REDACTED]   txqueuelen 1000  (Ethernet)
        RX packets 23170  bytes 30244963 (30.2 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 13457  bytes 1953778 (1.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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 529  bytes 52852 (52.8 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 529  bytes 52852 (52.8 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wgcf-profile: flags=209<UP,POINTOPOINT,RUNNING,NOARP>  mtu 1420
        inet [REDACTED]   netmask 255.255.255.255  destination [REDACTED] 
        inet6 [REDACTED]   prefixlen 128  scopeid 0x0<global>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 3217  bytes 4492360 (4.4 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2104  bytes 211560 (211.5 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[ViRb3]

Please check the new release 2.1.2, it may solve your problem.