Bug 465893 - NetworkManager-pptp set incorrect MTU when connecting a pptp server over a wlan interface which has MTU lower than 1500
NetworkManager-pptp set incorrect MTU when connecting a pptp server over a wl...
Product: Fedora
Classification: Fedora
Component: NetworkManager-pptp (Show other bugs)
All Linux
medium Severity high
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Assigned To: Lubomir Rintel
Fedora Extras Quality Assurance
Depends On:
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Reported: 2008-10-06 19:48 EDT by Miao ZhiCheng
Modified: 2009-07-14 10:27 EDT (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2009-07-14 10:27:20 EDT
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Description Miao ZhiCheng 2008-10-06 19:48:17 EDT
Description of problem:
I have a wlan0 interface like this:
$ /sbin/ifconfig wlan0
wlan0     Link encap:Ethernet  HWaddr 00:1D:E0:58:BA:E7  
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::21d:e0ff:fe58:bae7/64 Scope:Link
          RX packets:37916 errors:0 dropped:0 overruns:0 frame:0
          TX packets:35731 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:29619551 (28.2 MiB)  TX bytes:5179262 (4.9 MiB)
Its MTU is 1492,
And I created a pptp vpn by using network manager, I got an interface like this:
$ /sbin/ifconfig ppp0
ppp0      Link encap:Point-to-Point Protocol  
          inet addr:  P-t-P:  Mask:
          RX packets:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:100 (100.0 b)  TX bytes:94 (94.0 b)
Its MTU is 1496, more than the mtu of wlan0, it will cause the ppp0 lost connection after some activities over the pptp network.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
Prepare a network interface which has MTU lower than 1500, connecting a pptp server over that network. You'll get a pppX interface which has a MTU of 1496, then after you access big chunk data over the pppX, the pptp connection lost.
Actual results:
NetworkManager-pptp shall set MTU according to the mtu of the interface who loads it. And another improving feature recommendation is to provide a way to set MTU manually in NM-pptp configuration dialog.

Expected results:
NM-pptp set the MTU correctly.
Comment 1 Bug Zapper 2009-06-09 22:54:06 EDT
This message is a reminder that Fedora 9 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 9.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
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Comment 2 Bug Zapper 2009-07-14 10:27:20 EDT
Fedora 9 changed to end-of-life (EOL) status on 2009-07-10. Fedora 9 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.

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