Public bug reported:
I am using libvirt with KVM on a UBUNTU 18.04.3 LTS
I have the following topology inside libvirt/KVM
The default virtual network with IP range 10.0.0.0/24 on virbr0 interface with
IP 10.0.0.1 and DHCP enabled
Another virtual network named "confinada" with IP range 192.168.254.0/24 on
virbr1 interface with no IP and DHCP disabled
I have one VM with pfSense that is connected to the two networks and is acting
as a gateway to the others VMs.
I have one VM with UBUNTU 18.04 and one with Windows 7
The topology is as following:
192.168.254.103
10.0.0.1 10.0.0.138 192.168.254.1 +-- Windows 7
INTERNET <----------> HOST <------------> pfSense <-------------|
192.168.11.201 (default) (confinada) +-- UBUNTU
192.168.254.2
I have sucess accessing Internet on the Windows 7 VM but not on the
UBUNTU machine.
During debug i found that the packets from the UBUNTU machine are not being
NAT'ed correctly when leaving the host machine.
I compared the two VM and found that the UBUNTU VM is using device model
"virtio" and the Windows VM is using "rtl8139".
When i changed the device model of the UBUNTU VM to "rtl8139" it start
accessing the Internet.
The pfSense VM is using the device model "virtio" on both interfaces.
I tried to acess www.google.com (172.217.28.68) on the VM and used tcpdump on
the host interface.
I have the following results:
1 - Using "virtio" device model:
# tcpdump -nN -i enp2s0 host 172.217.28.68
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp2s0, link-type EN10MB (Ethernet), capture size 262144 bytes
12:16:02.347830 IP 10.0.0.138.47764 > 172.217.28.68.80: Flags [S], seq
2073890688, win 29200, options [mss 1460,sackOK,TS val 3101189393 ecr
0,nop,wscale 7], length 0
12:16:03.359092 IP 10.0.0.138.47764 > 172.217.28.68.80: Flags [S], seq
2073890688, win 29200, options [mss 1460,sackOK,TS val 3101190405 ecr
0,nop,wscale 7], length 0
12:16:05.375124 IP 10.0.0.138.47764 > 172.217.28.68.80: Flags [S], seq
2073890688, win 29200, options [mss 1460,sackOK,TS val 3101192421 ecr
0,nop,wscale 7], length 0
12:16:09.631218 IP 10.0.0.138.47764 > 172.217.28.68.80: Flags [S], seq
2073890688, win 29200, options [mss 1460,sackOK,TS val 3101196677 ecr
0,nop,wscale 7], length 0
2 - Using "rtl8139" device model:
# tcpdump -nN -i enp2s0 host 172.217.28.68
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp2s0, link-type EN10MB (Ethernet), capture size 262144 bytes
12:17:15.206181 IP 192.168.11.201.6085 > 172.217.28.68.80: Flags [S], seq
733025182, win 29200, options [mss 1460,sackOK,TS val 550129346 ecr
0,nop,wscale 7], length 0
12:17:15.226156 IP 172.217.28.68.80 > 192.168.11.201.6085: Flags [S.], seq
1016175004, ack 733025183, win 60192, options [mss 1360,sackOK,TS val
1081017811 ecr 550129346,nop,wscale 8], length 0
12:17:15.227137 IP 192.168.11.201.6085 > 172.217.28.68.80: Flags [.], ack 1,
win 229, options [nop,nop,TS val 550129367 ecr 1081017811], length 0
12:17:15.228442 IP 192.168.11.201.6085 > 172.217.28.68.80: Flags [P.], seq
1:142, ack 1, win 229, options [nop,nop,TS val 550129368 ecr 1081017811],
length 141: HTTP: GET / HTTP/1.1
The host system informations are:
root@jlbastos-desktop:~# lsb_release -rd
Description: Ubuntu 18.04.3 LTS
Release: 18.04
root@jlbastos-desktop:~#
root@jlbastos-desktop:~# apt-cache policy libvirt-bin libvirt-clients
libvirt-daemon libvirt0 qemu-kvm
libvirt-bin:
Instalado: 4.0.0-1ubuntu8.13
Candidato: 4.0.0-1ubuntu8.13
Tabela de versão:
*** 4.0.0-1ubuntu8.13 500
500 http://br.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
100 /var/lib/dpkg/status
4.0.0-1ubuntu8.12 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
4.0.0-1ubuntu8 500
500 http://br.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
libvirt-clients:
Instalado: 4.0.0-1ubuntu8.13
Candidato: 4.0.0-1ubuntu8.13
Tabela de versão:
*** 4.0.0-1ubuntu8.13 500
500 http://br.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
100 /var/lib/dpkg/status
4.0.0-1ubuntu8.12 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
4.0.0-1ubuntu8 500
500 http://br.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
libvirt-daemon:
Instalado: 4.0.0-1ubuntu8.13
Candidato: 4.0.0-1ubuntu8.13
Tabela de versão:
*** 4.0.0-1ubuntu8.13 500
500 http://br.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
100 /var/lib/dpkg/status
4.0.0-1ubuntu8.12 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
4.0.0-1ubuntu8 500
500 http://br.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
libvirt0:
Instalado: 4.0.0-1ubuntu8.13
Candidato: 4.0.0-1ubuntu8.13
Tabela de versão:
*** 4.0.0-1ubuntu8.13 500
500 http://br.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
100 /var/lib/dpkg/status
4.0.0-1ubuntu8.12 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
4.0.0-1ubuntu8 500
500 http://br.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
qemu-kvm:
Instalado: 1:2.11+dfsg-1ubuntu7.20
Candidato: 1:2.11+dfsg-1ubuntu7.20
Tabela de versão:
*** 1:2.11+dfsg-1ubuntu7.20 500
500 http://br.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
100 /var/lib/dpkg/status
1:2.11+dfsg-1ubuntu7 500
500 http://br.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
root@jlbastos-desktop:~#
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1853489
Title:
Ignoring the default NAT when using the virtio adapter
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