[libvirt-users] Default firewall rules and forwarding to a guest

[Laine Stump]

On 01/03/2017 06:44 PM, Omer Aldemir wrote:
> Thanks for the answers i think open network type is not available yet 
> on the version that comes with rhel7


Actually it is in RHEL 7.3. Although the feature is in upstream libvirt 
only starting in version 2.2.0, and RHEL7.3 libvirt is based on libvirt 
2.0.0, certain patches are backported into RHEL packages based on 
severity of bug vs. potential for introducing regressions vs. customer 
demand. This particular patch was backported into RHEL7.3 for 
https://bugzilla.redhat.com/846810


> On 3 Jan 2017, at 22:06, Laine Stump <laine at laine.org 
> <mailto:laine at laine.org>> wrote:
>
>> On 12/22/2016 09:48 AM, Omer Aldemir wrote:
>>>
>>> Hello,
>>>
>>>
>>> I am trying to understand how libvirt firewall rules are loaded as I 
>>> have firewalld and iptables services are disabled.
>>>
>>
>> libvirt will add its iptables rules via firewalld if firewalld is 
>> enabled and running, otherwise it executes iptables commands directly.
>>
>> w
>>>
>>>
>>> Where is the configuration files for firewall and NAT rules for libvirt?
>>>
>>
>> There are no configuration files for the iptables rules that libvirt 
>> adds. The simple set of rules that is added is fixed for each type of 
>> libvirt network - NAT, routed, and isolated. Here is a description of 
>> exactly what is added for each of these types of network:
>>
>> https://libvirt.org/firewall.html
>>
>> (actually I just realized that I forgot to add information there 
>> about a new network forwarding type I recently added - "open", which 
>> doesn't add *any* iptables rules - this is intended for those who 
>> want to do their own iptables setup for libvirt networks, outside of 
>> libvirt.)
>>
>>> How can I load default firewall rules if I mess things up
>>>
>>
>> To reload all the iptables rules for all active libvirt networks, 
>> just restart the libvirtd service.
>>
>>>
>>> Also I have realized that followings is default
>>>
>>>
>>> ACCEPT     all  --  0.0.0.0/0 192.168.122.0/24     ctstate 
>>> RELATED,ESTABLISHED
>>>
>>>
>>> but If I am to forward a port for a real IP to internal guest 
>>> machine I need
>>>
>>>
>>> ACCEPT     all  --  0.0.0.0/0 192.168.122.0/24     state 
>>> NEW,RELATED,ESTABLISHED
>>>
>>>
>>> (NEW state is required) and also of course a forwarding rule
>>>
>>>
>>> iptables -t nat -I PREROUTING -p tcp --dport 3389 -j DNAT 
>>> --to-destination 192.168.122.16:3389
>>>
>>>
>>> Is there a place I can make this rules static with LibVirt (not 
>>> playing with firewalld  and/or iptables service for Centos 7)
>>>
>>
>> The best that can be done with current libvirt is to create a "hook" 
>> script similar to the one described here:
>>
>> https://wiki.libvirt.org/page/Networking#Forwarding_Incoming_Connections
>>
>> (That worked the last time I tried it, but that was at least 3 years 
>> ago. The python script available as a link from that page is newer 
>> and promises to be easier to understand (maybe))
>
>
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