Bug 579866 - NetworkManager doesn't use negotiated MTU for DSL connections
Summary: NetworkManager doesn't use negotiated MTU for DSL connections
Keywords:
Status: CLOSED DUPLICATE of bug 579860
Alias: None
Product: Fedora
Classification: Fedora
Component: NetworkManager
Version: 12
Hardware: All
OS: Linux
low
medium
Target Milestone: ---
Assignee: Dan Williams
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2010-04-06 18:51 UTC by Saikat Guha
Modified: 2010-04-06 22:22 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2010-04-06 20:22:46 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description Saikat Guha 2010-04-06 18:51:10 UTC 
Description of problem:
On the wire PPP negotiates MTU 1480 (upstream requests 1480, and local endhost ACKs that request), but when ppp0 comes up, MTU is set to 1492.

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 DSL connection where upstream requests MRU 1480
    (NM defaults to 'Automatic' for MTU)
2. Establish connection
3. ifconfig ppp0
  
Actual results:
MTU=1492

Expected results:
MTU=1480
Comment 1 Dan Williams 2010-04-06 20:22:46 UTC 

*** This bug has been marked as a duplicate of bug 579860 ***
Comment 2 Saikat Guha 2010-04-06 22:22:34 UTC 
Are you sure it is a duplicate of bug 579860?

bug 579860 is when a *user manually overrides* the MTU in the Wired tab, those settings are not taken into account.

This bug is that the automatically negotiated MTU that happens as part of the *PPP handshake* (i.e. with default values in the Wired tab), that MTU is not taken into account.
Note You need to log in before you can comment on or make changes to this bug.