Public bug reported:
1. If the MTU of eth0 is 1500, network-manager fails to establish a
pppoe connection, and the MTU of eth0 (not ppp0) is then automatically
lowered to 1492. Now network-manager can successfully establish a pppoe
connection. If I manually set the MTU of eth0 back to 1500, network-
manager would fail again. See attached log.
2. The Access Concentrator of my ISP offers MTU values of both 1492 and
1442. pppd-2.4.5 in Ubuntu 14.04 adopts 1492 as the MTU of the ppp
device, while pppd-2.4.7 in Xenial adopts 1442. Setting the lower MTU on
the WAN link (ppp0) can easily cause PMTU-D problems, especially for
remote VPN clients.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.0.4-0ubuntu9
ProcVersionSignature: Ubuntu 4.4.0-6.21-generic 4.4.1
Uname: Linux 4.4.0-6-generic i686
ApportVersion: 2.20-0ubuntu3
Architecture: i386
CurrentDesktop: LXDE
Date: Sat Feb 20 09:56:32 2016
IpRoute:
default via 172.16.10.1 dev eth0 proto static metric 100
169.254.0.0/16 dev eth0 scope link metric 1000
172.16.10.0/24 dev eth0 proto kernel scope link src 172.16.10.32 metric 100
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=false
WWANEnabled=true
RfKill:
0: phy0: Wireless LAN
Soft blocked: yes
Hard blocked: no
SourcePackage: network-manager
UpgradeStatus: Upgraded to xenial on 2016-02-19 (0 days ago)
WpaSupplicantLog:
nmcli-dev:
DEVICE TYPE STATE DBUS-PATH
CONNECTION CON-UUID CON-PATH
eth0 ethernet connected /org/freedesktop/NetworkManager/Devices/1
Auto eth0 dff18f4d-6732-4eab-bd06-5209635b9bab
/org/freedesktop/NetworkManager/ActiveConnection/11
irda0 unknown disconnected /org/freedesktop/NetworkManager/Devices/2 --
-- --
eth1 wifi unavailable /org/freedesktop/NetworkManager/Devices/3 --
-- --
lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/0 --
-- --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2:
Error: Object 'nm' is unknown, try 'nmcli help'.
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 xenial
** Attachment added: "$ sed -n '/^Feb 20 08:45/,/^Feb 20 08:51/p'
/var/log/syslog | egrep '(pppd|NetworkManager)' | sed 's/.../<username>/g;
s/00:11:25:.../00:11:25:aa:bb:cc/g; s/ac:85:3d:../ac:85:3d:ee:dd:ff/g' >
network-manager-pppoe.log"
https://bugs.launchpad.net/bugs/1547754/+attachment/4576091/+files/network-manager-pppoe.log
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https://bugs.launchpad.net/bugs/1547754
Title:
pppoe MTU problems
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