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The PPTP-VPN connection over WiFi of my Ubuntu Xenial installation is
extremely unstable, repeated loss of connection (100% packet loss),
easily reproducible using network manager. The wlan module is r8712u
(Realtek Semiconductor Corp. RTL8191SU 802.11n WLAN Adapter). (System:
Linux Mint 18.3 Sylvia, xenial, linux 4.13.0-38-generic
#43~16.04.1-Ubuntu SMP, x86_64)
Wlan connection seems very stable basically but as soon as I start using
vpn it quickly is broken after a very short time. Example pptp vpn is
ca.hide.me but I tested other connections as well with the same result.
Network manager does not show a no-more-working connection visually
(regarding the symbols all looks good) but it is quickly noticeable that
no more internet sites are reacting as soon as the bug situation occurs
(which is very often, normally only after a few seconds!).
The vpn sites are working good with other clients, also the wlan (WPA2)
and wlan router itself at my home are working fine, several other client
system (Windows, Mobile, another Linux) are working without any issue,
thus it is definitely this specific network manager wlan/pptp-vpn client
with the r8712u module causing the trouble.
### here I try to demonstrate a typical situation, first stable later the error
I start with resetting wlan module r8712u first, letting network manager
establish a new connection to my wireless lan at 20:50-20:51h.
Connection is working fine so far. (Module output: insmod
/lib/modules/4.13.0-38-generic/kernel/drivers/staging/rtl8712/r8712u.ko)
Making a lot of traffic, parallel download etc. stress test, everything
is stable so it does not seem that the wireless lan has issues but only
the vpn client on top of it...
After disconnecting the broken vpn, the normal wlan traffic (internet
sites etc.) are working again.
But to show the case here I demonstrate first the working base scenario
and then the occuring bug situation.
First working situation before the bug occurs (starting with wlan reset first):
$ dmesg |tail -n20
[ 4869.764646] usbcore: deregistering interface driver r8712u
[ 4870.152409] usb 3-2: reset high-speed USB device number 2 using ehci-pci
[ 4871.333150] r8712u: module is from the staging directory, the quality is
unknown, you have been warned.
[ 4871.334319] r8712u: register rtl8712_netdev_ops to netdev_ops
[ 4871.334324] usb 3-2: r8712u: USB_SPEED_HIGH with 4 endpoints
[ 4871.334830] usb 3-2: r8712u: Boot from EFUSE: Autoload OK
[ 4871.873153] usb 3-2: r8712u: CustomerID = 0x0000
[ 4871.873158] usb 3-2: r8712u: MAC Address from efuse = 00:0d:81:af:00:fb
[ 4871.873161] usb 3-2: r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
[ 4871.873713] usbcore: registered new interface driver r8712u
[ 4871.877915] r8712u 3-2:1.0 wlx000d81af00fb: renamed from wlan0
[ 4871.907478] IPv6: ADDRCONF(NETDEV_UP): wlx000d81af00fb: link is not ready
[ 4872.652953] r8712u 3-2:1.0 wlx000d81af00fb: 1 RCR=0x153f00e
[ 4872.653709] r8712u 3-2:1.0 wlx000d81af00fb: 2 RCR=0x553f00e
[ 4874.164838] IPv6: ADDRCONF(NETDEV_UP): wlx000d81af00fb: link is not ready
[ 4874.206830] IPv6: ADDRCONF(NETDEV_UP): wlx000d81af00fb: link is not ready
[ 4887.083087] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[ 4887.088383] IPv6: ADDRCONF(NETDEV_UP): wlx000d81af00fb: link is not ready
[ 4887.121475] IPv6: ADDRCONF(NETDEV_UP): wlx000d81af00fb: link is not ready
[ 4895.089398] IPv6: ADDRCONF(NETDEV_CHANGE): wlx000d81af00fb: link becomes
ready
$ nmcli d
DEVICE TYPE STATE CONNECTION
wlx000d81af00fb wifi connected Automatisch BM12E3
enp3s0 ethernet unavailable --
lo loopback unmanaged --
$ nmcli c
NAME UUID TYPE
DEVICE
Automatisch BM12E3 e49fbaa5-14d9-400e-8c04-14602717479c 802-11-wireless
wlx000d81af00fb
Wired connection 1 c235039e-b313-3c6b-9701-e4ad24cac272 802-3-ethernet --
ca.hide.me b0c7374c-e6ba-4752-bd67-8751dc389126 vpn --
# debug mode has been set now for better logging
$ sudo nmcli general logging level debug
### Then 21:13h now after making test connection to ca.hide.me and
making some traffic, after a short time the bug situation occurs... vpn
still seems to be connected but is completely broken.
# ok, no more internet sites responding and package loss at 100%
$ PING google.de (172.217.19.67) 56(84) bytes of data.
--- google.de ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2034ms
---
syslog continues error spam messages like that:
Apr 11 21:13:08 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:10 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:10 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:10 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:10 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:11 bluefx NetworkManager[8698]: <debug> [1523473991.4877] QL: qual
95/95/0x5F, level 100/100/0x64, noise 0/0/0x0, updated: 0x7 ** MAX: qual
100/100/0x64, level 100/100/0x64, noise 100/100/0x64, updated: 0x7
Apr 11 21:13:11 bluefx NetworkManager[8698]: <debug> [1523473991.4878] QL2:
level_percent is 100. max_level 100, level 100.
Apr 11 21:13:11 bluefx NetworkManager[8698]: <debug> [1523473991.4878] QL:
Final quality percent is 95 (95).
Apr 11 21:13:14 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:14 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:14 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:14 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:14 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:14 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:15 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:15 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:15 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:15 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:15 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:15 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:17 bluefx NetworkManager[8698]: <debug> [1523473997.4869] QL: qual
94/94/0x5E, level 100/100/0x64, noise 0/0/0x0, updated: 0x7 ** MAX: qual
100/100/0x64, level 100/100/0x64, noise 100/100/0x64, updated: 0x7
Apr 11 21:13:17 bluefx NetworkManager[8698]: <debug> [1523473997.4870] QL2:
level_percent is 100. max_level 100, level 100.
Apr 11 21:13:17 bluefx NetworkManager[8698]: <debug> [1523473997.4870] QL:
Final quality percent is 94 (94).
Apr 11 21:13:18 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:18 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:18 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:18 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:20 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:20 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
Apr 11 21:13:20 bluefx pppd[12334]: Protocol-Reject for unsupported protocol
'Compressed Datagram' (0xfd)
Apr 11 21:13:20 bluefx NetworkManager[8698]: Protocol-Reject for unsupported
protocol 'Compressed Datagram' (0xfd)
---
(attached)
$ journalctl --no-pager > system-log_with_bugged_vpn
---
$ nmcli d
DEVICE TYPE STATE CONNECTION
wlx000d81af00fb wifi connected Automatisch BM12E3
enp3s0 ethernet unavailable --
lo loopback unmanaged --
ppp0 ppp unmanaged --
$ nmcli c
NAME UUID TYPE
DEVICE
Automatisch BM12E3 e49fbaa5-14d9-400e-8c04-14602717479c 802-11-wireless
wlx000d81af00fb
ca.hide.me b0c7374c-e6ba-4752-bd67-8751dc389126 vpn
wlx000d81af00fb
Wired connection 1 c235039e-b313-3c6b-9701-e4ad24cac272 802-3-ethernet --
---
Network manager packages:
Network Manager: network-manager
1.2.6-0ubuntu0.16.04.2 amd64 network
management framework (daemon and userspace tools)
network-manager-gnome
1.2.6-0ubuntu0.16.04.4 amd64
network management framework (GNOME frontend)
(PPTP plugin core)
ii network-manager-pptp-gnome 1.1.93-1ubuntu1
amd64 network management
framework
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: network pptp r8712u realtek vpn wifi wlan
--
Network manager PPTP VPN connection very unstable, connection breaks (lost
packets)
https://bugs.launchpad.net/bugs/1763157
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