Bug 803752 - ifup-eth and ifdown-eth incorrectly handle bridged devices and unreliably build and tear down tunnels for TAP devices
ifup-eth and ifdown-eth incorrectly handle bridged devices and unreliably bui...
Product: Fedora
Classification: Fedora
Component: initscripts (Show other bugs)
x86_64 Linux
unspecified Severity medium
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Assigned To: Bill Nottingham
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-03-15 11:17 EDT by Steve Willoughby
Modified: 2014-03-16 23:30 EDT (History)
7 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2013-02-13 14:33:12 EST
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
sample ifcfg-ethx and ifcfg-tapx files and patch files to correct the problem (6.90 KB, application/x-compressed-tar)
2012-03-15 11:17 EDT, Steve Willoughby
no flags Details
Some examples of common net config files (5.43 KB, text/plain)
2012-04-02 13:20 EDT, Steve Willoughby
no flags Details
revised patch file to replace ifup-eth.f16.pat (1.42 KB, patch)
2012-04-02 13:24 EDT, Steve Willoughby
no flags Details | Diff

  None (edit)
Description Steve Willoughby 2012-03-15 11:17:28 EDT
Created attachment 570318 [details]
sample ifcfg-ethx and ifcfg-tapx files and patch files to correct the problem

Description of problem:
ifup-eth builds a bridge device but does not assign addresses or other interface specific properties. Sometimes a second 'service network restart' will get an address assigned. Ifup-eth uses tunctl to build a TAP device tunnel I/F but the way tunctl is used creates tunx or tapx devices other than the intended number when invoked more than once because ifdown-eth does not correctly tear down the tunnel using tunctl. I was also not able to use tunnels created by tunctl with openvpn. Also noted that the bridge and member interfaces were not explicitly set to promiscuous mode. Openvpn reliably creates tap and tun device interfaces, so is preferred over tunctl when available.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. introduce BRIDGE=br0 into ifcfg-eth files
2. reboot or execute 'service network restart' 
Actual results:
bridge will be created, but no IP address will be assigned to the br0 device nor the eth devices. Example ifcfg files attached.

Expected results:
bridge should be created with an IP address specified in one of the ifcfg-ethx files.

Additional info: provided are some ifcfg files used to reproduce the issue. Also provided are patch files to fix the problem: correctly apply interface parameters to the bridge device, apply promiscuous mode to the bridge device and member interfaces, create tun and tap interfaces preferentially using openvpn (if available), then tunctl, correctly tear down tun and tap interfaces, reliably remove members from the bridge and tear down the bridge on last member removal.

The f16.pat files are for Fedora 16 and the cos.pat are for CentOS 6.2. I have filed a separate bug report for CentOS 6.2.
Comment 1 Bill Nottingham 2012-03-15 11:27:53 EDT
The config files look wrong - IP addresses go in the bridge configuration file, not in the underlying device file.
Comment 2 Steve Willoughby 2012-03-26 16:58:08 EDT
Can you provide a set of sample config files or point me to the documentation on how this is supposed to be done - I haven't found anything that really covers this in enough detail to make it work as you seem to indicate.
Comment 3 Bill Nottingham 2012-03-26 17:05:03 EDT
All the IP configuration would go in a ifcfg-br0 file with TYPE=Bridge.
Comment 4 Bill Nottingham 2012-03-26 17:06:34 EDT
I.e., something like this ifcfg-br0:


The IP configuration would then be removed from ifcfg-eth0, so it just looks like:

Comment 5 Steve Willoughby 2012-04-02 13:20:56 EDT
Created attachment 574565 [details]
Some examples of common net config files

Add aditional documentation to initscripts to provide some samples of common network configurations including use of bridged interfaces and tunnels.
Comment 6 Steve Willoughby 2012-04-02 13:24:35 EDT
Created attachment 574570 [details]
revised patch file to replace ifup-eth.f16.pat

Reverted to account for correct handling of bridge address configuration with correctly formatted ifcfg-br0 file.
Comment 7 Bill Nottingham 2012-04-02 15:42:11 EDT
That still doesn't look right (note: diff -u format preferred) - the bridge settings should not need frobbed from the device config file.
Comment 8 Fedora End Of Life 2013-01-16 11:09:40 EST
This message is a reminder that Fedora 16 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 16. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
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Comment 9 Fedora End Of Life 2013-02-13 14:33:16 EST
Fedora 16 changed to end-of-life (EOL) status on 2013-02-12. Fedora 16 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

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