[Bug 1294807] Re: "manual" type interfaces should allow the mtu stanza

[Chris J Arges]

** Description changed:

+ [Impact] 
+  * Using mtu options on manual interfaces setup with ifupdown will not work.
+ 
+ [Test Case]
+  * Edit /etc/networking/interface and modify a manual interface such as:
+ 
+ auto eth1
+ iface eth1 inet manual
+     mtu 9000
+ 
+ * Bring down the interface and back up.
+ $ ifdown eth1
+ $ ifup eth1
+ 
+ * Check mtu:
+ $ ip link show eth1
+ 
+ It should show mtu 9000
+ 
+ [Regression Potential] 
+  * This code is already in Trusty.
+ 
+ --
+ 
  1. Ubuntu 12.04/14.04
  
  3. Expected: That MTU will be set with the mtu option
  4. What happens:  You need to use pre-up/post-up ifconfig mtu to set the option

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https://bugs.launchpad.net/bugs/1294807

Title:
  "manual" type interfaces should allow the mtu stanza

Status in “ifupdown” package in Ubuntu:
  Fix Released
Status in “ifupdown” source package in Precise:
  Fix Committed

Bug description:
  [Impact] 
   * Using mtu options on manual interfaces setup with ifupdown will not work.

  [Test Case]
   * Edit /etc/networking/interface and modify a manual interface such as:

  auto eth1
  iface eth1 inet manual
      mtu 9000

  * Bring down the interface and back up.
  $ ifdown eth1
  $ ifup eth1

  * Check mtu:
  $ ip link show eth1

  It should show mtu 9000

  [Regression Potential] 
   * This code is already in Trusty.

  --

  1. Ubuntu 12.04/14.04

  3. Expected: That MTU will be set with the mtu option
  4. What happens:  You need to use pre-up/post-up ifconfig mtu to set the option

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