Hello,
I have first a question (and then may be a problem), that I have difficulties to
understand and eventually to investigate.
On each of my guests VM, I see constantly a RX dropped number increasing , Even
if the VM does nothing !
ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.100.15 netmask 255.255.255.0 broadcast 192.168.100.255
inet6 fe80::5054:ff:fe36:ac80 prefixlen 64 scopeid 0x20<link>
ether 52:54:00:36:ac:80 txqueuelen 1000 (Ethernet)
RX packets 1966 bytes 122391 (119.5 KiB)
RX errors 0 dropped 1288 overruns 0 frame 0
TX packets 552 bytes 99939 (97.5 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 4 bytes 340 (340.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4 bytes 340 (340.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
(1) Is that a normal behaviour ?
(2) Could you give me some hints where/how to investigate
Here are a number of informations:
- The virsh LAN setup
- The VM XML description
- iptables-save on the hosts
- and then some packages version
Thanks in advance
Patrick
My setup is as follow:
An host running a Fedora 23 (minimal) and a VM guest running a Fedora 23
I have created 3 Networks ,
- 2 fully isolated ( mgt-private-lan and pre-private-lan)
- 1 Nat via the host NIC
Here after are the information related to the nat Network on which I have
consistent increase of RX Dropped Packets
virsh net-list
Name State Autostart Persistent
----------------------------------------------------------
mgt-private-lan active yes yes
nat-internet active yes yes
prd-private-lan active yes yes
virsh net-info nat-internet
Name: nat-internet
UUID: 4cff86b1-8e63-40be-ac9c-d3dcd405a9d3
Active: yes
Persistent: yes
Autostart: yes
Bridge: virbr1
virsh net-dumpxml nat-internet
<network connections='5'>
<name>nat-internet</name>
<uuid>4cff86b1-8e63-40be-ac9c-d3dcd405a9d3</uuid>
<forward dev='eth0' mode='nat'>
<nat>
<port start='1024' end='65535'/>
</nat>
<interface dev='eth0'/>
</forward>
<bridge name='virbr1' stp='on' delay='0'/>
<mac address='52:54:00:e4:ec:1b'/>
<domain name='nat-internet'/>
<ip address='192.168.100.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.100.128'
end='192.168.100.254'/>
</dhcp>
</ip>
</network>
here is the XML of the VM
[root@ks3 boot]# virsh dumpxml Network
<domain type='kvm' id='5'>
<name>Network</name>
<uuid>006ec4e9-028c-4fef-94ec-4e9efbab61ff</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64'
machine='pc-i440fx-2.4'>hvm</type>
<kernel>/var/lib/libvirt/boot/vmlinuz</kernel>
<initrd>/var/lib/libvirt/boot/initramfs.img</initrd>
<cmdline>root=/dev/vda selinux=0 audit=0 console=ttyS0 nosplash
quiet</cmdline>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='custom' match='exact'>
<model fallback='allow'>SandyBridge</model>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/bin/qemu-kvm</emulator>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none'
io='native'/>
<source dev='/dev/vault-storage/network-root'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x08' function='0x0'/>
</disk>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none'
io='native'/>
<source dev='/dev/vault-storage/network-bootswap'/>
<backingStore/>
<target dev='vdb' bus='virtio'/>
<alias name='virtio-disk1'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x09' function='0x0'/>
</disk>
<controller type='usb' index='0'
model='ich9-ehci1'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x07' function='0x7'/>
</controller>
<controller type='usb' index='0'
model='ich9-uhci1'>
<alias name='usb'/>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x07' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0'
model='ich9-uhci2'>
<alias name='usb'/>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x07' function='0x1'/>
</controller>
<controller type='usb' index='0'
model='ich9-uhci3'>
<alias name='usb'/>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x07' function='0x2'/>
</controller>
<controller type='pci' index='0'
model='pci-root'>
<alias name='pci.0'/>
</controller>
<controller type='virtio-serial' index='0'>
<alias name='virtio-serial0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x06' function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:54:00:36:ac:80'/>
<source network='nat-internet' bridge='virbr1'/>
<target dev='vnet12'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/5'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/5'>
<source path='/dev/pts/5'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<channel type='unix'>
<source mode='bind'
path='/var/lib/libvirt/qemu/channel/target/Network.org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0'
state='connected'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0'
bus='0' port='1'/>
</channel>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' port='5904' autoport='yes'
listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<video>
<model type='cirrus' vram='16384'
heads='1'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0a' function='0x0'/>
</memballoon>
</devices>
</domain>
iptables-save
# Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016
*nat
:PREROUTING ACCEPT [14895:623423]
:INPUT ACCEPT [12645:432591]
:OUTPUT ACCEPT [123:8518]
:POSTROUTING ACCEPT [595:37490]
-A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 6514 -j DNAT
--to-destination 192.168.100.10:6514
-A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 80 -j DNAT
--to-destination 192.168.100.12:80
-A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 443 -j DNAT
--to-destination 192.168.100.12:443
-A POSTROUTING -s 192.168.100.0/24 -d 224.0.0.0/24 -o eth0 -j RETURN
-A POSTROUTING -s 192.168.100.0/24 -d 255.255.255.255/32 -o eth0 -j RETURN
-A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -p tcp -j
MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -p udp -j
MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -j MASQUERADE
COMMIT
# Completed on Sat Jan 23 10:49:51 2016
# Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016
*mangle
:PREROUTING ACCEPT [1212763:799851388]
:INPUT ACCEPT [169753:18403044]
:FORWARD ACCEPT [1043010:781448344]
:OUTPUT ACCEPT [123913:208199933]
:POSTROUTING ACCEPT [1166923:989648277]
-A POSTROUTING -o virbr1 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
-A POSTROUTING -o virbr3 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
-A POSTROUTING -o virbr2 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
COMMIT
# Completed on Sat Jan 23 10:49:51 2016
# Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [120960:207745702]
-A INPUT -i virbr1 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -i virbr1 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -i virbr1 -p udp -m udp --dport 67 -j ACCEPT
-A INPUT -i virbr1 -p tcp -m tcp --dport 67 -j ACCEPT
-A INPUT -i virbr3 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -i virbr3 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -i virbr3 -p udp -m udp --dport 67 -j ACCEPT
-A INPUT -i virbr3 -p tcp -m tcp --dport 67 -j ACCEPT
-A INPUT -i virbr2 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -i virbr2 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -i virbr2 -p udp -m udp --dport 67 -j ACCEPT
-A INPUT -i virbr2 -p tcp -m tcp --dport 67 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -m string --string "GET /w00tw00t.at.ISC
.SANS." --algo bm --to 70 -j DROP
-A INPUT -m set --match-set banned src -j DROP
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 23 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -d 192.168.100.12/32 -p tcp -m state --state NEW -m tcp --dport 443
-j ACCEPT
-A FORWARD -d 192.168.100.12/32 -p tcp -m state --state NEW -m tcp --dport 80 -j
ACCEPT
-A FORWARD -d 192.168.100.10/32 -p tcp -m state --state NEW -m tcp --dport 6514
-j ACCEPT
-A FORWARD -d 192.168.100.0/24 -i eth0 -o virbr1 -m conntrack --ctstate
RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -s 192.168.100.0/24 -i virbr1 -o eth0 -j ACCEPT
-A FORWARD -i virbr1 -o virbr1 -j ACCEPT
-A FORWARD -o virbr1 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr1 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr3 -o virbr3 -j ACCEPT
-A FORWARD -o virbr3 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr3 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr2 -o virbr2 -j ACCEPT
-A FORWARD -o virbr2 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr2 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -m set --match-set banned src -j DROP
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -o virbr1 -p udp -m udp --dport 68 -j ACCEPT
-A OUTPUT -o virbr3 -p udp -m udp --dport 68 -j ACCEPT
-A OUTPUT -o virbr2 -p udp -m udp --dport 68 -j ACCEPT
COMMIT
# Completed on Sat Jan 23 10:49:51 2016
rpm -qa | grep libvirt
libvirt-daemon-driver-nodedev-1.2.18.2-1.fc23.x86_64
libvirt-daemon-driver-storage-1.2.18.2-1.fc23.x86_64
libvirt-daemon-config-network-1.2.18.2-1.fc23.x86_64
libvirt-daemon-1.2.18.2-1.fc23.x86_64
libvirt-daemon-driver-secret-1.2.18.2-1.fc23.x86_64
libvirt-daemon-driver-network-1.2.18.2-1.fc23.x86_64
libvirt-daemon-driver-nwfilter-1.2.18.2-1.fc23.x86_64
libvirt-daemon-driver-qemu-1.2.18.2-1.fc23.x86_64
libvirt-daemon-kvm-1.2.18.2-1.fc23.x86_64
libvirt-client-1.2.18.2-1.fc23.x86_64
libvirt-daemon-driver-interface-1.2.18.2-1.fc23.x86_64
rpm -qa | grep qemu
qemu-common-2.4.1-5.fc23.x86_64
qemu-kvm-2.4.1-5.fc23.x86_64
qemu-img-2.4.1-5.fc23.x86_64
ipxe-roms-qemu-20150407-3.gitdc795b9f.fc23.noarch
libvirt-daemon-driver-qemu-1.2.18.2-1.fc23.x86_64
qemu-system-x86-2.4.1-5.fc23.x86_64
rpm -qa | grep kvm
qemu-kvm-2.4.1-5.fc23.x86_64
libvirt-daemon-kvm-1.2.18.2-1.fc23.x86_64
Last, if in the VM I add “driver name = ‘emu’, after boot I have few dropped packets, but then it doesn’t increase anymore !> > <interface type='network'> > <mac address='52:54:00:36:ac:80'/> > <source network='nat-internet' bridge='virbr1'/> > <target dev='vnet12'/> > <model type='virtio’/><driver name=‘emu’/>> <alias name='net0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> > </interface>> On 23 Jan 2016, at 10:58, pichon <patrick@pichon.me> wrote: > > Hello, > > I have first a question (and then may be a problem), that I have difficulties to understand and eventually to investigate. > > On each of my guests VM, I see constantly a RX dropped number increasing , Even if the VM does nothing ! > > ifconfig > eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 > inet 192.168.100.15 netmask 255.255.255.0 broadcast 192.168.100.255 > inet6 fe80::5054:ff:fe36:ac80 prefixlen 64 scopeid 0x20<link> > ether 52:54:00:36:ac:80 txqueuelen 1000 (Ethernet) > RX packets 1966 bytes 122391 (119.5 KiB) > RX errors 0 dropped 1288 overruns 0 frame 0 > TX packets 552 bytes 99939 (97.5 KiB) > TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 > > lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 > inet 127.0.0.1 netmask 255.0.0.0 > inet6 ::1 prefixlen 128 scopeid 0x10<host> > loop txqueuelen 0 (Local Loopback) > RX packets 4 bytes 340 (340.0 B) > RX errors 0 dropped 0 overruns 0 frame 0 > TX packets 4 bytes 340 (340.0 B) > TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 > > > > (1) Is that a normal behaviour ? > (2) Could you give me some hints where/how to investigate > > > Here are a number of informations: > > - The virsh LAN setup > - The VM XML description > - iptables-save on the hosts > - and then some packages version > > Thanks in advance > Patrick > > > > My setup is as follow: > > An host running a Fedora 23 (minimal) and a VM guest running a Fedora 23 > > I have created 3 Networks , > - 2 fully isolated ( mgt-private-lan and pre-private-lan) > - 1 Nat via the host NIC > > Here after are the information related to the nat Network on which I have consistent increase of RX Dropped Packets > > virsh net-list > Name State Autostart Persistent > ---------------------------------------------------------- > mgt-private-lan active yes yes > nat-internet active yes yes > prd-private-lan active yes yes > > > virsh net-info nat-internet > Name: nat-internet > UUID: 4cff86b1-8e63-40be-ac9c-d3dcd405a9d3 > Active: yes > Persistent: yes > Autostart: yes > Bridge: virbr1 > > > > virsh net-dumpxml nat-internet > <network connections='5'> > <name>nat-internet</name> > <uuid>4cff86b1-8e63-40be-ac9c-d3dcd405a9d3</uuid> > <forward dev='eth0' mode='nat'> > <nat> > <port start='1024' end='65535'/> > </nat> > <interface dev='eth0'/> > </forward> > <bridge name='virbr1' stp='on' delay='0'/> > <mac address='52:54:00:e4:ec:1b'/> > <domain name='nat-internet'/> > <ip address='192.168.100.1' netmask='255.255.255.0'> > <dhcp> > <range start='192.168.100.128' end='192.168.100.254'/> > </dhcp> > </ip> > </network> > > > > > here is the XML of the VM > > > > [root@ks3 boot]# virsh dumpxml Network > <domain type='kvm' id='5'> > <name>Network</name> > <uuid>006ec4e9-028c-4fef-94ec-4e9efbab61ff</uuid> > <memory unit='KiB'>1048576</memory> > <currentMemory unit='KiB'>1048576</currentMemory> > <vcpu placement='static'>1</vcpu> > <resource> > <partition>/machine</partition> > </resource> > <os> > <type arch='x86_64' machine='pc-i440fx-2.4'>hvm</type> > <kernel>/var/lib/libvirt/boot/vmlinuz</kernel> > <initrd>/var/lib/libvirt/boot/initramfs.img</initrd> > <cmdline>root=/dev/vda selinux=0 audit=0 console=ttyS0 nosplash quiet</cmdline> > <boot dev='hd'/> > </os> > <features> > <acpi/> > <apic/> > </features> > <cpu mode='custom' match='exact'> > <model fallback='allow'>SandyBridge</model> > </cpu> > <clock offset='utc'> > <timer name='rtc' tickpolicy='catchup'/> > <timer name='pit' tickpolicy='delay'/> > <timer name='hpet' present='no'/> > </clock> > <on_poweroff>destroy</on_poweroff> > <on_reboot>restart</on_reboot> > <on_crash>restart</on_crash> > <pm> > <suspend-to-mem enabled='no'/> > <suspend-to-disk enabled='no'/> > </pm> > <devices> > <emulator>/usr/bin/qemu-kvm</emulator> > <disk type='block' device='disk'> > <driver name='qemu' type='raw' cache='none' io='native'/> > <source dev='/dev/vault-storage/network-root'/> > <backingStore/> > <target dev='vda' bus='virtio'/> > <alias name='virtio-disk0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> > </disk> > <disk type='block' device='disk'> > <driver name='qemu' type='raw' cache='none' io='native'/> > <source dev='/dev/vault-storage/network-bootswap'/> > <backingStore/> > <target dev='vdb' bus='virtio'/> > <alias name='virtio-disk1'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> > </disk> > <controller type='usb' index='0' model='ich9-ehci1'> > <alias name='usb'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/> > </controller> > <controller type='usb' index='0' model='ich9-uhci1'> > <alias name='usb'/> > <master startport='0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0' multifunction='on'/> > </controller> > <controller type='usb' index='0' model='ich9-uhci2'> > <alias name='usb'/> > <master startport='2'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/> > </controller> > <controller type='usb' index='0' model='ich9-uhci3'> > <alias name='usb'/> > <master startport='4'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/> > </controller> > <controller type='pci' index='0' model='pci-root'> > <alias name='pci.0'/> > </controller> > <controller type='virtio-serial' index='0'> > <alias name='virtio-serial0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> > </controller> > <interface type='network'> > <mac address='52:54:00:36:ac:80'/> > <source network='nat-internet' bridge='virbr1'/> > <target dev='vnet12'/> > <model type='virtio'/> > <alias name='net0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> > </interface> > <serial type='pty'> > <source path='/dev/pts/5'/> > <target port='0'/> > <alias name='serial0'/> > </serial> > <console type='pty' tty='/dev/pts/5'> > <source path='/dev/pts/5'/> > <target type='serial' port='0'/> > <alias name='serial0'/> > </console> > <channel type='unix'> > <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/Network.org.qemu.guest_agent.0'/> > <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/> > <alias name='channel0'/> > <address type='virtio-serial' controller='0' bus='0' port='1'/> > </channel> > <input type='mouse' bus='ps2'/> > <input type='keyboard' bus='ps2'/> > <graphics type='spice' port='5904' autoport='yes' listen='127.0.0.1'> > <listen type='address' address='127.0.0.1'/> > </graphics> > <video> > <model type='cirrus' vram='16384' heads='1'/> > <alias name='video0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> > </video> > <memballoon model='virtio'> > <alias name='balloon0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/> > </memballoon> > </devices> > </domain> > > > iptables-save > # Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016 > *nat > :PREROUTING ACCEPT [14895:623423] > :INPUT ACCEPT [12645:432591] > :OUTPUT ACCEPT [123:8518] > :POSTROUTING ACCEPT [595:37490] > -A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 6514 -j DNAT --to-destination 192.168.100.10:6514 > -A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.100.12:80 > -A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 443 -j DNAT --to-destination 192.168.100.12:443 > -A POSTROUTING -s 192.168.100.0/24 -d 224.0.0.0/24 -o eth0 -j RETURN > -A POSTROUTING -s 192.168.100.0/24 -d 255.255.255.255/32 -o eth0 -j RETURN > -A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -p tcp -j MASQUERADE --to-ports 1024-65535 > -A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -p udp -j MASQUERADE --to-ports 1024-65535 > -A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -j MASQUERADE > COMMIT > # Completed on Sat Jan 23 10:49:51 2016 > # Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016 > *mangle > :PREROUTING ACCEPT [1212763:799851388] > :INPUT ACCEPT [169753:18403044] > :FORWARD ACCEPT [1043010:781448344] > :OUTPUT ACCEPT [123913:208199933] > :POSTROUTING ACCEPT [1166923:989648277] > -A POSTROUTING -o virbr1 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill > -A POSTROUTING -o virbr3 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill > -A POSTROUTING -o virbr2 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill > COMMIT > # Completed on Sat Jan 23 10:49:51 2016 > # Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016 > *filter > :INPUT ACCEPT [0:0] > :FORWARD ACCEPT [0:0] > :OUTPUT ACCEPT [120960:207745702] > -A INPUT -i virbr1 -p udp -m udp --dport 53 -j ACCEPT > -A INPUT -i virbr1 -p tcp -m tcp --dport 53 -j ACCEPT > -A INPUT -i virbr1 -p udp -m udp --dport 67 -j ACCEPT > -A INPUT -i virbr1 -p tcp -m tcp --dport 67 -j ACCEPT > -A INPUT -i virbr3 -p udp -m udp --dport 53 -j ACCEPT > -A INPUT -i virbr3 -p tcp -m tcp --dport 53 -j ACCEPT > -A INPUT -i virbr3 -p udp -m udp --dport 67 -j ACCEPT > -A INPUT -i virbr3 -p tcp -m tcp --dport 67 -j ACCEPT > -A INPUT -i virbr2 -p udp -m udp --dport 53 -j ACCEPT > -A INPUT -i virbr2 -p tcp -m tcp --dport 53 -j ACCEPT > -A INPUT -i virbr2 -p udp -m udp --dport 67 -j ACCEPT > -A INPUT -i virbr2 -p tcp -m tcp --dport 67 -j ACCEPT > -A INPUT -p tcp -m tcp --dport 80 -m string --string "GET /w00tw00t.at.ISC .SANS." --algo bm --to 70 -j DROP > -A INPUT -m set --match-set banned src -j DROP > -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT > -A INPUT -p icmp -j ACCEPT > -A INPUT -i lo -j ACCEPT > -A INPUT -p tcp -m state --state NEW -m tcp --dport 23 -j ACCEPT > -A INPUT -j REJECT --reject-with icmp-host-prohibited > -A FORWARD -d 192.168.100.12/32 -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT > -A FORWARD -d 192.168.100.12/32 -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT > -A FORWARD -d 192.168.100.10/32 -p tcp -m state --state NEW -m tcp --dport 6514 -j ACCEPT > -A FORWARD -d 192.168.100.0/24 -i eth0 -o virbr1 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT > -A FORWARD -s 192.168.100.0/24 -i virbr1 -o eth0 -j ACCEPT > -A FORWARD -i virbr1 -o virbr1 -j ACCEPT > -A FORWARD -o virbr1 -j REJECT --reject-with icmp-port-unreachable > -A FORWARD -i virbr1 -j REJECT --reject-with icmp-port-unreachable > -A FORWARD -i virbr3 -o virbr3 -j ACCEPT > -A FORWARD -o virbr3 -j REJECT --reject-with icmp-port-unreachable > -A FORWARD -i virbr3 -j REJECT --reject-with icmp-port-unreachable > -A FORWARD -i virbr2 -o virbr2 -j ACCEPT > -A FORWARD -o virbr2 -j REJECT --reject-with icmp-port-unreachable > -A FORWARD -i virbr2 -j REJECT --reject-with icmp-port-unreachable > -A FORWARD -m set --match-set banned src -j DROP > -A FORWARD -j REJECT --reject-with icmp-host-prohibited > -A OUTPUT -o virbr1 -p udp -m udp --dport 68 -j ACCEPT > -A OUTPUT -o virbr3 -p udp -m udp --dport 68 -j ACCEPT > -A OUTPUT -o virbr2 -p udp -m udp --dport 68 -j ACCEPT > COMMIT > # Completed on Sat Jan 23 10:49:51 2016 > > > > rpm -qa | grep libvirt > libvirt-daemon-driver-nodedev-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-driver-storage-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-config-network-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-driver-secret-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-driver-network-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-driver-nwfilter-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-driver-qemu-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-kvm-1.2.18.2-1.fc23.x86_64 > libvirt-client-1.2.18.2-1.fc23.x86_64 > libvirt-daemon-driver-interface-1.2.18.2-1.fc23.x86_64 > > > > rpm -qa | grep qemu > qemu-common-2.4.1-5.fc23.x86_64 > qemu-kvm-2.4.1-5.fc23.x86_64 > qemu-img-2.4.1-5.fc23.x86_64 > ipxe-roms-qemu-20150407-3.gitdc795b9f.fc23.noarch > libvirt-daemon-driver-qemu-1.2.18.2-1.fc23.x86_64 > qemu-system-x86-2.4.1-5.fc23.x86_64 > > > rpm -qa | grep kvm > qemu-kvm-2.4.1-5.fc23.x86_64 > libvirt-daemon-kvm-1.2.18.2-1.fc23.x86_64 > >
Troels Arvin
2016-Jan-26 19:51 UTC
Re: [libvirt-users] RX dropped packets on guests subnets
pichon wrote: Hello, pichon wrote:> On each of my guests VM, I see constantly a RX dropped number increasing > , Even if the VM does nothing !I'm seeing the same phenomenon on one of our LANs (on another LAN, I don't see it). My setup is with RHEL 7, and it is seen on both physical and virtual servers. I don't see it on any RHEL 5 or 6 servers. A strange observation: If I start tcpdump, the package drops stop. (Setting the NIC in promisc mode does not have any impact; it has to be tcpdump.) I suspect that it has to do with this: https://www.netiq.com/support/kb/doc.php?id=7007165 If this is the case, it's simply because recent kernels classify packets, and then there's nothing to worry about. - But Red Hat Support does not share that view. I have an open case with Red Hat Support about it; lots of stuff has been tried, but we have yet to reach a conclusion. -- Troels
Hello, I’m using the Fedora 23 disturb, with recent kernel on all of my systems ( VMs and Physicals), I see the rx packet dropped only on VMs when I disable the virtio-net driver , by adding driver name=‘emu’ in the XML. But indeed if I started the tcpdump, the dropped stopped. Patrick> On 26 Jan 2016, at 20:51, Troels Arvin <troels@arvin.dk> wrote: > > pichon wrote: > > Hello, > > pichon wrote: >> On each of my guests VM, I see constantly a RX dropped number increasing >> , Even if the VM does nothing ! > > I'm seeing the same phenomenon on one of our LANs (on another LAN, I > don't see it). My setup is with RHEL 7, and it is seen on both physical > and virtual servers. I don't see it on any RHEL 5 or 6 servers. > > A strange observation: If I start tcpdump, the package drops stop. > (Setting the NIC in promisc mode does not have any impact; it has to be > tcpdump.) > > I suspect that it has to do with this: > https://www.netiq.com/support/kb/doc.php?id=7007165 > If this is the case, it's simply because recent kernels classify packets, > and then there's nothing to worry about. > > - But Red Hat Support does not share that view. I have an open case with > Red Hat Support about it; lots of stuff has been tried, but we have yet > to reach a conclusion. > > -- > Troels > > > _______________________________________________ > libvirt-users mailing list > libvirt-users@redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users >
Hello, For me it makes sense that the dropped stop when you are using tcpdump as you are indeed takes those packets ! For me the main question, is why such traffic is going to the VM ? Kind regards Patrick> On 26 Jan 2016, at 20:51, Troels Arvin <troels@arvin.dk> wrote: > > pichon wrote: > > Hello, > > pichon wrote: >> On each of my guests VM, I see constantly a RX dropped number increasing >> , Even if the VM does nothing ! > > I'm seeing the same phenomenon on one of our LANs (on another LAN, I > don't see it). My setup is with RHEL 7, and it is seen on both physical > and virtual servers. I don't see it on any RHEL 5 or 6 servers. > > A strange observation: If I start tcpdump, the package drops stop. > (Setting the NIC in promisc mode does not have any impact; it has to be > tcpdump.) > > I suspect that it has to do with this: > https://www.netiq.com/support/kb/doc.php?id=7007165 > If this is the case, it's simply because recent kernels classify packets, > and then there's nothing to worry about. > > - But Red Hat Support does not share that view. I have an open case with > Red Hat Support about it; lots of stuff has been tried, but we have yet > to reach a conclusion. > > -- > Troels > > > _______________________________________________ > libvirt-users mailing list > libvirt-users@redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users >
Arvin, Thanks a lot for pointing tcpdump. What I have observe is that the packets which seems to be dropped are STP related [root@network ~]# tcpdump -i eth0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes 23:15:37.967118 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:39.967163 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:41.967121 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:43.967147 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:45.967118 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:47.967156 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:49.967131 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:51.967132 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:53.967195 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:55.967138 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 23:15:57.967165 STP 802.1d, Config, Flags [none], bridge-id 8000.52:54:00:e4:ec:1b.8003, length 35 Now, my main issue is that I observe those packets also in the disabled virtio-net driver (with driver name=qemu), but in that case, no packets are dropped So is that a different behaviour of the bvirtio-net when it is in Kernel mode and when it is in User space ? Patrick> On 26 Jan 2016, at 20:51, Troels Arvin <troels@arvin.dk> wrote: > > pichon wrote: > > Hello, > > pichon wrote: >> On each of my guests VM, I see constantly a RX dropped number increasing >> , Even if the VM does nothing ! > > I'm seeing the same phenomenon on one of our LANs (on another LAN, I > don't see it). My setup is with RHEL 7, and it is seen on both physical > and virtual servers. I don't see it on any RHEL 5 or 6 servers. > > A strange observation: If I start tcpdump, the package drops stop. > (Setting the NIC in promisc mode does not have any impact; it has to be > tcpdump.) > > I suspect that it has to do with this: > https://www.netiq.com/support/kb/doc.php?id=7007165 > If this is the case, it's simply because recent kernels classify packets, > and then there's nothing to worry about. > > - But Red Hat Support does not share that view. I have an open case with > Red Hat Support about it; lots of stuff has been tried, but we have yet > to reach a conclusion. > > -- > Troels > > > _______________________________________________ > libvirt-users mailing list > libvirt-users@redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users >
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