Bug 433846 - vpnc hard-coded mtu in tun0 creation
Summary: vpnc hard-coded mtu in tun0 creation
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: vpnc
Version: 8
Hardware: All
OS: Linux
low
medium
Target Milestone: ---
Assignee: Tomas Mraz
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2008-02-21 18:35 UTC by Brian Long
Modified: 2008-04-03 08:42 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2008-04-03 08:42:18 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description Brian Long 2008-02-21 18:35:51 UTC 
Description of problem:
/etc/vpnc/vpnc-script has a hard-coded MTU of 1412 used to bring up the tun0
interface.  This is an invalid MTU if the underlying Ethernet interface (i.e.
eth0) already has a lower-than-normal MTU of 1400.  vpnc-script should read the
existing MTU from the interface and subtract a certain number of bytes to
determine its MTU instead of hard-coding 1412.

Version-Release number of selected component (if applicable):
vpnc-0.5.1-2.fc8

How reproducible:
Always

Steps to Reproduce:
1. ifconfig eth0 mtu 1400
2. vpnc Config
3. ifconfig tun0 shows mtu 1412, greater than eth0.
4. scp large file over VPN connection and scp will stall
  
Actual results:
scp stalls

Expected results:
scp finishes

Additional info:
If I edit vpnc-script and replace 1412 with 1300, scp works fine when my eth0
mtu is 1400.
Comment 1 Tomas Mraz 2008-04-03 08:42:18 UTC 
Fixed in rawhide.
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