[Bug 881558] [NEW] Regression in test logic for MTU 576 in /sbin/dhclient-script

[Stolen]

Public bug reported:

the following lines of /sbin/dhclient-script fails to detect MTU of 576:
~$ grep -A1 -n 'lt 576' /sbin/dhclient-script
177:if [ -z "$new_interface_mtu" ] || [ "$new_interface_mtu" -lt 576 ]; then
178-    new_interface_mtu=''

The correct syntax is -le not -lt.
This has also been reported in debian:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=638267
But should be a simple fix and not require a new package.

The result of this error is that the MTU of an interface configured by
DHCP is dropped down to 576.


$ lsb_release -rd
Description:    Ubuntu 11.10
Release:        11.10

$ apt-cache policy isc-dhcp-client
isc-dhcp-client:
  Installed: 4.1.1-P1-17ubuntu10
  Candidate: 4.1.1-P1-17ubuntu10
  Version table:
 *** 4.1.1-P1-17ubuntu10 0
        500 http://ubuntu.arcticnetwork.ca/ oneiric/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: isc-dhcp-client 4.1.1-P1-17ubuntu10
ProcVersionSignature: Ubuntu 3.0.0-12.20-server 3.0.4
Uname: Linux 3.0.0-12-server x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Tue Oct 25 11:27:50 2011
ExecutablePath: /sbin/dhclient
InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
ProcAttrCurrent: /sbin/dhclient (enforce)
ProcEnviron: PATH=(custom, no user)
SourcePackage: isc-dhcp
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.dhcp.dhclient.conf: [modified]
mtime.conffile..etc.dhcp.dhclient.conf: 2011-10-22T23:01:24.846117

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric

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https://bugs.launchpad.net/bugs/881558

Title:
  Regression in test logic for MTU 576 in /sbin/dhclient-script

Status in “isc-dhcp” package in Ubuntu:
  New

Bug description:
  the following lines of /sbin/dhclient-script fails to detect MTU of 576:
  ~$ grep -A1 -n 'lt 576' /sbin/dhclient-script
  177:if [ -z "$new_interface_mtu" ] || [ "$new_interface_mtu" -lt 576 ]; then
  178-    new_interface_mtu=''

  The correct syntax is -le not -lt.
  This has also been reported in debian:
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=638267
  But should be a simple fix and not require a new package.

  The result of this error is that the MTU of an interface configured by
  DHCP is dropped down to 576.

  
  $ lsb_release -rd
  Description:    Ubuntu 11.10
  Release:        11.10

  $ apt-cache policy isc-dhcp-client
  isc-dhcp-client:
    Installed: 4.1.1-P1-17ubuntu10
    Candidate: 4.1.1-P1-17ubuntu10
    Version table:
   *** 4.1.1-P1-17ubuntu10 0
          500 http://ubuntu.arcticnetwork.ca/ oneiric/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: isc-dhcp-client 4.1.1-P1-17ubuntu10
  ProcVersionSignature: Ubuntu 3.0.0-12.20-server 3.0.4
  Uname: Linux 3.0.0-12-server x86_64
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Tue Oct 25 11:27:50 2011
  ExecutablePath: /sbin/dhclient
  InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  ProcAttrCurrent: /sbin/dhclient (enforce)
  ProcEnviron: PATH=(custom, no user)
  SourcePackage: isc-dhcp
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.dhcp.dhclient.conf: [modified]
  mtime.conffile..etc.dhcp.dhclient.conf: 2011-10-22T23:01:24.846117

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