<div dir="ltr"><div dir="ltr">hi,<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 21, 2023 at 3:40 PM Michal Prívozník <<a href="mailto:mprivozn@redhat.com">mprivozn@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 3/19/23 20:21, Natxo Asenjo wrote:<br> > hi,<br> > <br> > I have configured a routed network on my laptop with a ipv6 subnet and<br> > dnsmasq is handing out ipv6 addresses to my vms and it works really wel,<br> > but finding out which ips have been used is not as easy as with ipv4.<br> > <br> > [root@lenovo ~]# virsh domifaddr --domain wec --source lease<br> > Name MAC address Protocol Address<br> > -------------------------------------------------------------------------------<br> > <br> > [root@lenovo ~]# virsh domifaddr --domain wec --source arp<br> > Name MAC address Protocol Address<br> > -------------------------------------------------------------------------------<br> > <br> > When using a ipv4 network, this works:<br> > <br> > root@lenovo ~]# virsh domifaddr --domain evenng --source arp<br> > Name MAC address Protocol Address<br> > -------------------------------------------------------------------------------<br> > vnet2 52:54:00:4c:83:98 ipv4 <a href="http://192.168.122.229/0" rel="noreferrer" target="_blank">192.168.122.229/0</a><br> > <<a href="http://192.168.122.229/0" rel="noreferrer" target="_blank">http://192.168.122.229/0</a>><br> > <br> > [root@lenovo ~]# virsh domifaddr --domain evenng --source lease<br> > Name MAC address Protocol Address<br> > -------------------------------------------------------------------------------<br> > vnet2 52:54:00:4c:83:98 ipv4 <a href="http://192.168.122.229/24" rel="noreferrer" target="_blank">192.168.122.229/24</a><br> > <<a href="http://192.168.122.229/24" rel="noreferrer" target="_blank">http://192.168.122.229/24</a>><br> > <br> > I can obviously look into the leases file and find out the address, but<br> > it would be nice to be able to use the virt tooling.<br> <br> Looks like you won't find any info for IPv6 there, because that's<br> exactly what '--source lease' is doing. Are you sure that your IPv6<br> address is not autoconfigured and it indeed is libvirt spawned dnsmasq<br> that's assigning the IPv6 address?<br></blockquote><div><br></div><div>this is the xml:</div><div><br></div><div># cat networks/ipv6.xml <br><br><br><network><br> <name>ipv6</name><br> <uuid>49957183-e4e4-4541-8746-11be67f0a511</uuid><br> <forward mode='open'/><br> <bridge name='virbr1' stp='on' delay='0'/><br> <mac address='52:54:00:09:8e:66'/><br> <domain name='ipv6'/><br> <ip family='ipv6' address='2a02:xxx:xx:7::1' prefix='64'><br> <dhcp><br> <range start='2a02:xxx:xx:7::100' end='2a02:xxx:xx:7::1ff'/><br> </dhcp><br> </ip><br></network></div><div><br></div><div>so it looks like a dhcp server to me ;-)</div><div><br></div><div>I just found out about virsh net-dhcp-leases and that one lists the leases:<br></div><div><br></div><div># virsh net-dhcp-leases --network ipv6 <br> Expiry Time MAC address Protocol IP address Hostname Client ID or DUID<br>---------------------------------------------------------------------------------------------------------------------------------------------<br> 2023-03-22 16:35:44 52:54:00:0e:ee:da ipv6 2a02:xxx:xx:7::1ba/64 WIN-C0HD8RH61MI 00:01:00:01:2b:a7:05:c5:52:54:00:0e:ee:da</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> <br> For the '--source arp' case - libvirt reads the arp table (effectively<br> the same info is exposed under /proc/net/arp file) and finds a matching<br> entry there, based on the MAC address. Can you see whether there's a match?<br></blockquote><div><br></div><div>No, that only entry right now there is my router:</div><div><br></div><div>]# cat /proc/net/arp <br>IP address HW type Flags HW address Mask Device<br>xx.x.x.1 0x1 0x2 cafebabecafe * wifi0<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> <br> And lastly - there's '--source agent' which is most likely to return<br> useful information, but that requires guest agent running inside.<br></blockquote><div><br></div><div>Indeed, no agent running on the vm, could add it. <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> <br> Michal<br> <br> > <br> > This is on a fedora 37 running qemu-kvm-7.0.0-14.fc37.x86_64 and<br> > dnsmasq-2.89-1.fc37.x86_64, everything intalled from the fedora<br> > repositories.<br> <br> <br> So is it safe to assume that libvirt (which is where you're reporting<br> the issue) is: libvirt-8.6.0-5.fc37 ?<br></blockquote><div><br></div><div>yes: libvirt-8.6.0-5.fc37.x86_64</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> <br> Michal<br> <br> </blockquote></div><div><br></div><div>So dumping the net-dhcp-leases works also for me, it's just not consequent with the ipv4 behaviour, that's all. <br></div><br><div dir="ltr" class="gmail_signature">--<br>regards,<br>natxo</div></div>