[libvirt-users] nwfilter multiple IPs

[Andre Goree]

On 2018/03/29 5:30 pm, Andre Goree wrote:
> I'm trying to apply a nwfilter rule for two networks on the same guest
> interface, like so:
> 
> ~ # virsh nwfilter-dumpxml 1081532-private-both
> <filter name='1081532-private-both' chain='root'>
>   <uuid>16004b94-2b62-4568-9467-169908eb4040</uuid>
>   <rule action='accept' direction='in' priority='500'>
>     <ip srcipaddr='10.25.104.0' srcipmask='24'/>
>   </rule>
>   <rule action='accept' direction='in' priority='600'>
>     <ip srcipaddr='10.117.50.0' srcipmask='24'/>
>   </rule>
>   <rule action='drop' direction='in' priority='1000'/>
> </filter>
> 
> 
> Within the guest, the IPs are both setup on one interface, with the IP
> for second network (10.117.50.0/24) configured as an alias, like so:
> 
> 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> state UP group default qlen 1000
>     link/ether 00:00:0a:d0:4e:f3 brd ff:ff:ff:ff:ff:ff
>     inet 10.25.104.1/24 brd 10.25.104.255 scope global eth1
>        valid_lft forever preferred_lft forever
>     inet 10.117.50.1/24 brd 10.117.50.255 scope global eth1:0
>        valid_lft forever preferred_lft forever
>     inet6 fe80::200:aff:fed0:4ef3/64 scope link
>        valid_lft forever preferred_lft forever
> 
> 
> The problem I'm running into is that after applying the nwfilter, I
> cannot reach the second network, only the first.  Is this an issue
> with both IPs being on the same interface?  The machine I'm attempting
> to reach has the same exact configuration -- i.e. it has an IP on the
> same network for both networks.
> 
> Thanks in advance for any advice that can be given.
> 


I was able to get this working via the following, in case anyone else 
runs into this (it's pretty straight forward, so don't expect many to 
run into my same ID10T problem):

<filter name='7925-private-both' priority='-700'>
   <uuid>a79560cc-9405-4483-8692-4143b00b48ed</uuid>
   <rule action='accept' direction='in' priority='500'>
     <ip srcipaddr='10.25.104.0' srcipmask='24'/>
   </rule>
   <rule action='accept' direction='out' priority='500'>
     <ip dstipaddr='10.25.104.0' dstipmask='24'/>
   </rule>
   <rule action='accept' direction='in' priority='500'>
     <ip srcipaddr='10.47.215.0' srcipmask='24'/>
   </rule>
   <rule action='accept' direction='out' priority='500'>
     <ip dstipaddr='10.47.215.0' dstipmask='24'/>
   </rule>
   <rule action='accept' direction='in' priority='500'>
     <ip srcipaddr='10.47.216.0' srcipmask='24'/>
   </rule>
   <rule action='accept' direction='out' priority='500'>
     <ip dstipaddr='10.47.216.0' dstipmask='24'/>
   </rule>
   <rule action='drop' direction='in' priority='1000'/>
   <rule action='drop' direction='out' priority='1000'/>
</filter>


The ranges are different than in my original post, but that's of course 
arbitrary.

-- 
Andre Goree
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