[Bug 1136301] [NEW] IFACE names in /etc/network/interfaces cannot contain a hyphen, otherwise up and down commands are skipped

[RayH]

Public bug reported:

Reproduced on Ubuntu 2.6.24-32-generic

The sample configuration for /etc/network/interfaces for Hurricane
Electric IPv6 tunnels uses an IFACE name of he-ipv6.

I came across problems with command line commands that worked fine under
sudo, but did not work when stored in /etc/network/interfaces.

The problem looks strongly related to the inclusion of a hyphen "-" in
the interface name.

sudo ip link set mtu 1460 dev he-ipv6

worked fine.

A config line in /etc/network/interfaces like

up ip link set mtu 1460 dev he-ipv6

did not work, and the MTU remaind at 1480 at the next reboot.

Whereas:

up ip link set mtu 1460 dev $IFACE

did work fine, and the MTU was reduced to 1460, as intended.

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: ifupdown inteface names

** Description changed:

- The sample config for /etc/network/interfaces uses for Hurricane
+ Reproduced on Ubuntu 2.6.24-32-generic
+ 
+ The sample configuration for /etc/network/interfaces for Hurricane
  Electric IPv6 tunnels uses an IFACE name of he-ipv6.
  
  I came across problems with command line commands that worked fine under
  sudo, but did not work when stored in /etc/network/interfaces.
  
  The problem looks strongly related to the inclusion of a hyphen "-" in
- the interface name
+ the interface name.
  
- So a config line like
+ sudo ip link set mtu 1460 dev he-ipv6
+ 
+ worked fine.
+ 
+ A config line in /etc/network/interfaces like
  
  up ip link set mtu 1460 dev he-ipv6
  
- did not work, and the MTU remaind at 1480 at the next reboot
+ did not work, and the MTU remaind at 1480 at the next reboot.
  
- whereas:
+ Whereas:
  
  up ip link set mtu 1460 dev $IFACE
  
- did, and the MTU was reduced to 1460, as intended
+ did work fine, and the MTU was reduced to 1460, as intended.

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https://bugs.launchpad.net/bugs/1136301

Title:
  IFACE names in /etc/network/interfaces cannot contain a hyphen,
  otherwise up and down commands are skipped

Status in “ifupdown” package in Ubuntu:
  New

Bug description:
  Reproduced on Ubuntu 2.6.24-32-generic

  The sample configuration for /etc/network/interfaces for Hurricane
  Electric IPv6 tunnels uses an IFACE name of he-ipv6.

  I came across problems with command line commands that worked fine
  under sudo, but did not work when stored in /etc/network/interfaces.

  The problem looks strongly related to the inclusion of a hyphen "-" in
  the interface name.

  sudo ip link set mtu 1460 dev he-ipv6

  worked fine.

  A config line in /etc/network/interfaces like

  up ip link set mtu 1460 dev he-ipv6

  did not work, and the MTU remaind at 1480 at the next reboot.

  Whereas:

  up ip link set mtu 1460 dev $IFACE

  did work fine, and the MTU was reduced to 1460, as intended.

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