Description of problem: Configured MTU is not used for DSL connections. Version-Release number of selected component (if applicable): NetworkManager-0.7.998-2.git20100106.fc12.x86_64 How reproducible: Always Steps to Reproduce: 1. Create a new DSL connection (PPPoE) 2. Set MTU to 1480 3. Establish DSL connection 4. ifcfg ppp0 Actual results: MTU=1492 Expected results: MTU=1480
*** Bug 579866 has been marked as a duplicate of this bug. ***
When you say you set the MTU in step #2, do you mean in the "Wired" tab?
Yes, in the Wired tab.
Hmm, 1492 is used as default value when MTU is not set. Could you post /var/log/messages log?
2010-04-08T21:33:40.226385+05:18 dent NetworkManager: <info> Activation (eth0) starting connection 'Home DSL' 2010-04-08T21:33:40.226428+05:18 dent NetworkManager: <info> (eth0): device state change: 3 -> 4 (reason 0) 2010-04-08T21:33:40.226441+05:18 dent NetworkManager: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled... 2010-04-08T21:33:40.226970+05:18 dent NetworkManager: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) started... 2010-04-08T21:33:40.226989+05:18 dent NetworkManager: <info> Activation (eth0) Stage 2 of 5 (Device Configure) scheduled... 2010-04-08T21:33:40.227001+05:18 dent NetworkManager: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) complete. 2010-04-08T21:33:40.227013+05:18 dent NetworkManager: <info> Activation (eth0) Stage 2 of 5 (Device Configure) starting... 2010-04-08T21:33:40.227025+05:18 dent NetworkManager: <info> (eth0): device state change: 4 -> 5 (reason 0) 2010-04-08T21:33:40.227150+05:18 dent NetworkManager: <info> Activation (eth0) Stage 2 of 5 (Device Configure) successful. 2010-04-08T21:33:40.227165+05:18 dent NetworkManager: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled. 2010-04-08T21:33:40.227177+05:18 dent NetworkManager: <info> Activation (eth0) Stage 2 of 5 (Device Configure) complete. 2010-04-08T21:33:40.227242+05:18 dent NetworkManager: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) started... 2010-04-08T21:33:40.227269+05:18 dent NetworkManager: <info> (eth0): device state change: 5 -> 7 (reason 0) 2010-04-08T21:33:40.227407+05:18 dent NetworkManager: <info> Starting pppd connection 2010-04-08T21:33:40.229375+05:18 dent dbus-daemon: Rejected send message, 2 matched rules; type="error", sender=":1.393" (uid=0 pid=1570 comm="NetworkManager) interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply=0 destination=":1.502" (uid=0 pid=20187 comm="/usr/sbin/pppd)) 2010-04-08T21:33:40.229456+05:18 dent dbus-daemon: Rejected send message, 2 matched rules; type="error", sender=":1.393" (uid=0 pid=1570 comm="NetworkManager) interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply=0 destination=":1.502" (uid=0 pid=20187 comm="/usr/sbin/pppd)) 2010-04-08T21:33:40.229544+05:18 dent dbus-daemon: Rejected send message, 2 matched rules; type="error", sender=":1.393" (uid=0 pid=1570 comm="NetworkManager) interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply=0 destination=":1.502" (uid=0 pid=20187 comm="/usr/sbin/pppd)) 2010-04-08T21:33:40.229628+05:18 dent dbus-daemon: Rejected send message, 2 matched rules; type="error", sender=":1.393" (uid=0 pid=1570 comm="NetworkManager) interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply=0 destination=":1.502" (uid=0 pid=20187 comm="/usr/sbin/pppd)) 2010-04-08T21:33:40.229722+05:18 dent dbus-daemon: Rejected send message, 2 matched rules; type="error", sender=":1.393" (uid=0 pid=1570 comm="NetworkManager) interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply=0 destination=":1.502" (uid=0 pid=20187 comm="/usr/sbin/pppd)) 2010-04-08T21:33:40.240987+05:18 dent NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP6 Configure Get) scheduled... 2010-04-08T21:33:40.241086+05:18 dent NetworkManager: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) complete. 2010-04-08T21:33:40.241121+05:18 dent NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP6 Configure Get) started... 2010-04-08T21:33:40.241133+05:18 dent NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP6 Configure Get) complete. 2010-04-08T21:33:40.242722+05:18 dent pppd[21555]: Plugin rp-pppoe.so loaded. 2010-04-08T21:33:40.242830+05:18 dent pppd[21555]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.5 2010-04-08T21:33:40.255764+05:18 dent pppd[21555]: Plugin /usr/lib64/pppd/2.4.5/nm-pppd-plugin.so loaded. 2010-04-08T21:33:40.273347+05:18 dent pppd[21555]: pppd 2.4.5 started by root, uid 0 2010-04-08T21:33:40.284596+05:18 dent pppd[20187]: Exit. 2010-04-08T21:33:40.384045+05:18 dent pppd[21555]: PPP session is 47 2010-04-08T21:33:40.384098+05:18 dent pppd[21555]: Connected to 00:0c:42:3d:b4:e0 via interface eth0 2010-04-08T21:33:40.384963+05:18 dent pppd[21555]: Using interface ppp0 2010-04-08T21:33:40.385013+05:18 dent pppd[21555]: Connect: ppp0 <--> eth0 2010-04-08T21:33:40.500952+05:18 dent pppd[21555]: CHAP authentication succeeded 2010-04-08T21:33:40.501149+05:18 dent pppd[21555]: peer from calling number 00:0C:42:3D:B4:E0 authorized 2010-04-08T21:33:40.516042+05:18 dent pppd[21555]: local IP address 172.16.11.238 2010-04-08T21:33:40.516274+05:18 dent pppd[21555]: remote IP address 202.62.83.3 2010-04-08T21:33:40.516434+05:18 dent pppd[21555]: primary DNS address 202.62.77.2 2010-04-08T21:33:40.516635+05:18 dent pppd[21555]: secondary DNS address 202.62.64.3 2010-04-08T21:33:40.517837+05:18 dent NetworkManager: <info> PPP manager(IP Config Get) reply received. 2010-04-08T21:33:40.517985+05:18 dent NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP4 Configure Get) scheduled... 2010-04-08T21:33:40.518092+05:18 dent NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP4 Configure Get) started... 2010-04-08T21:33:40.518120+05:18 dent NetworkManager: <info> Activation (eth0) Stage 5 of 5 (IP Configure Commit) scheduled... 2010-04-08T21:33:40.518146+05:18 dent NetworkManager: <info> Activation (eth0) Stage 4 of 5 (IP4 Configure Get) complete. 2010-04-08T21:33:40.518170+05:18 dent NetworkManager: <info> Activation (eth0) Stage 5 of 5 (IP Configure Commit) started... 2010-04-08T21:33:40.532021+05:18 dent pppd[21555]: CCP terminated by peer (No compression negotiated) 2010-04-08T21:33:40.532217+05:18 dent pppd[21555]: Compression disabled by peer. 2010-04-08T21:33:41.545518+05:18 dent NetworkManager: <info> (eth0): device state change: 7 -> 8 (reason 0) 2010-04-08T21:33:41.546939+05:18 dent dnsmasq[20166]: reading /etc/resolv.conf 2010-04-08T21:33:41.547101+05:18 dent dnsmasq[20166]: using nameserver 202.62.64.3#53 2010-04-08T21:33:41.547131+05:18 dent dnsmasq[20166]: using nameserver 202.62.77.2#53 2010-04-08T21:33:41.547228+05:18 dent dnsmasq[20166]: cleared cache 2010-04-08T21:33:41.562441+05:18 dent NetworkManager: <info> Policy set 'Home DSL' (ppp0) as default for routing and DNS. 2010-04-08T21:33:41.562559+05:18 dent NetworkManager: <info> Activation (eth0) successful, device activated. 2010-04-08T21:33:41.562609+05:18 dent NetworkManager: <info> Activation (eth0) Stage 5 of 5 (IP Configure Commit) complete.
The wired tab's MTU applies to the *ethernet* device, not the PPP device. To make things worse, the PPP interface MTU/MRU is negotiated by pppd, and not available to the plugin since pppd just sets the MTU on ppp0. So I guess what we need to do is to, in the pppd plugin, grab the MTU off the interface and send that back to NM as the PPP interface MTU, then adjust the underlying device MTU (ie eth0) to be less than that. That would likely take care of the issue. Since the PPP MTU is autonegotiated, we shouldn't need to manually adjust it or provide UI for it anywhere.
(In reply to comment #6) > we need to do is to, in the pppd plugin, grab the MTU off the interface and > send that back to NM as the PPP interface MTU, then adjust the underlying > device MTU (ie eth0) to be less than that. The problem I am facing is that the MTU for the *ppp* device is being reset to 1492 after pppd negotiates 1480. My current workaround after NM establishes the connection is to run "ifconfig ppp0 mtu 1480" .... the MTU for the ethernet device is still 1500.
This message is a reminder that Fedora 12 is nearing its end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 12. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '12'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 12's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 12 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora please change the 'version' of this bug to the applicable version. If you are unable to change the version, please add a comment here and someone will do it for you. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. The process we are following is described here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Fedora 12 changed to end-of-life (EOL) status on 2010-12-02. Fedora 12 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.