Bug 557024 - iptables script starts despite disabling with chkconfig
iptables script starts despite disabling with chkconfig
Product: Fedora
Classification: Fedora
Component: libvirt (Show other bugs)
All Linux
low Severity medium
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Assigned To: Daniel Veillard
Fedora Extras Quality Assurance
: Reopened
Depends On:
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Reported: 2010-01-20 01:45 EST by Andrew McNabb
Modified: 2010-11-08 11:30 EST (History)
10 users (show)

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Doc Type: Bug Fix
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Last Closed: 2010-11-08 11:30:47 EST
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Description Andrew McNabb 2010-01-20 01:45:29 EST
I ran "chkconfig iptables off" and "chkconfig --list iptables" shows that the service is disabled for all runlevels.  However, when I reboot, the system has tons of rules as shown with "iptables -L".  Running "service iptables stop" clears out the offending rules.  How are rules getting added to the tables?  Is some other script adding them or is /etc/init.d/iptables somehow getting run?  Thanks.
Comment 1 Andrew McNabb 2010-01-20 01:55:15 EST
Hmm.  I can't tell for sure, but it looks like this might somehow be related to libvirtd.  Libvirtd seems to create a bunch of network devices, start up an instance of dnsmasq with the network, and add iptables rules, but only the first time it is started.  Is it a bug, then, that "service iptables stop" removes the rules created by libvirtd?  I admit I'm very confused and uninformed about the whole thing.
Comment 2 Michael Breuer 2010-02-04 14:51:07 EST
Anything in boot.log, messages or dmesg? /etc/rc.d/rc.local?

Fedora Bugzappers volunteer triage team
Comment 3 Thomas Woerner 2010-06-01 09:39:43 EDT
These rules are added by libvirtd for guests by hand. Currently the rules are not persistent and therefore stopping the iptables service will remove them on stop.
Comment 4 Bug Zapper 2010-11-03 20:27:55 EDT
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Comment 5 Andrew McNabb 2010-11-04 16:16:10 EDT
It looks like these rules are still being added by libvirtd in Fedora 14.  Which is especially weird since I already have a bridge, so libvirtd doesn't need to create an interface at all.
Comment 6 Thomas Woerner 2010-11-05 04:31:58 EDT
THe rules are added by libvirt, there is nothing the iptables service can do for now. So maybe would be best to assign to libvirt.
Comment 7 Daniel Berrange 2010-11-08 05:05:09 EST
libvirt creates rules to setup NAT for the default virtual network on virbr0. These rules only allow outbound traffic, and explicitly block inbound traffic on virbr0. If you don't want the virtual network, then disable it  'virsh net-destroy default && virsh net-autostart --disable default'.
Comment 8 Andrew McNabb 2010-11-08 11:16:57 EST
In the case that these rules are desired, then it would be incorrect for "service iptables stop" to delete the rules, right?  Unless they automatically get readded on "service iptables start".
Comment 9 Daniel Berrange 2010-11-08 11:30:47 EST
Unfortunately the iptables initscript provides no viable way to preserve custom iptables additions, This problem is discussed in bug 227011.  libvirtd will re-create its iptables rules upon restart/reload

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