Bug 995480

Summary:	Can't port-forward to virtual machine with firewall-config.
Product:	[Fedora] Fedora	Reporter:	Peter Oliver <mavit>
Component:	firewalld	Assignee:	Thomas Woerner <twoerner>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	19	CC:	jpopelka, twoerner
Target Milestone:	---
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Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-04-10 14:02:57 UTC	Type:	Bug
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Peter Oliver 2013-08-09 13:47:44 UTC

The command "iptables -S -t filter | grep -- '^-A FORWARD '" produces the following output:

-A FORWARD -d 192.168.122.0/24 -o virbr0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -s 192.168.122.0/24 -i virbr0 -j ACCEPT
-A FORWARD -i virbr0 -o virbr0 -j ACCEPT
-A FORWARD -o virbr0 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr0 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -j FORWARD_direct
-A FORWARD -j FORWARD_IN_ZONES_SOURCE
-A FORWARD -j FORWARD_IN_ZONES
-A FORWARD -j FORWARD_OUT_ZONES_SOURCE
-A FORWARD -j FORWARD_OUT_ZONES
-A FORWARD -p icmp -j ACCEPT
-A FORWARD -j REJECT --reject-with icmp-host-prohibited

It's my understanding that the rules mentioning virbr0 are added automatically by libvirtd in response to me having a virtual machine with the default NAT networking.  Good so far.

Alas, the virbr0-related REJECT rules appear quite early in this table, making it impossible to influence packets with rules added to the FORWARD_* subtables by the firewall-config tool.

Please consider arranging for firewalld's rules to be processed before libvirtd's REJECT rules.

Comment 1 Peter Oliver 2013-08-09 13:48:26 UTC

For the benefit of anyone having the same problem, I'll mention that as a workaround I have added the following to my /etc/rc.d/local:

( sleep 60; iptables -A FORWARD -o virbr0 -j REJECT --reject-with icmp-port-unreachable; iptables -D FORWARD -o virbr0 -j REJECT --reject-with icmp-port-unreachable ) &

Comment 2 Jiri Popelka 2014-04-10 14:02:57 UTC

Thank you very much Peter for the investigation and work-around !

*** This bug has been marked as a duplicate of bug 1079088 ***