OK, I have a strange problem. It is probably something simple/stupid, but I cannot figure it out.
I have a nice new PowerEdge T20 that I installed CentOS 6 (6.5) on with Virtualization (KVM). I then installed Ubuntu 14.04 in a virtual machine, with a bridged network:
------ begin ub140464.xml------------------ <domain type='kvm' id='2'> <name>ub140464</name> <uuid>53f7caec-1ff8-3bcd-3387-781dbc686907</uuid> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='x86_64' machine='rhel6.5.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/vg_newserver00/ub140464'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <controller type='usb' index='0'> <alias name='usb0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='network'> <mac address='52:54:00:11:43:29'/> <source network='virbr1'/> <target dev='macvtap0'/> <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/1'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/1'> <source path='/dev/pts/1'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> <sound model='ich6'> <alias name='sound0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='cirrus' vram='9216' 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='0x06' function='0x0'/> </memballoon> </devices> <seclabel type='dynamic' model='selinux' relabel='yes'> <label>system_u:system_r:svirt_t:s0:c369,c592</label> <imagelabel>system_u:object_r:svirt_image_t:s0:c369,c592</imagelabel> </seclabel> </domain> ------ end ub140464.xml --------------------
------ begin virbr1.xml --------------------- <network connections='1'> <name>virbr1</name> <uuid>c2621cc7-49d7-a94d-d682-a77a3f1fcbef</uuid> <forward dev='em1' mode='bridge'> <interface dev='em1' connections='1'/> </forward> </network> ------ end virbr1.xml ---------------------
The Ububtu VM can connect to the LAN the T20 is on and off into the public Internet. Machines on the LAN (eg my laptop) can connect to Ububtu VM. *BUT* the host server cannot connect to the Ububtu VM and the Ububtu cannot connect to the host server.
Netstat -r on the T20 (host server): [root@newserver ~]# netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.1.0 * 255.255.255.0 U 0 0 0 em1 192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0 link-local * 255.255.0.0 U 0 0 0 em1 default server1.wendell 0.0.0.0 UG 0 0 0 em1
Netstat -r on the Ubuntu VM: heller@ub140464:~$ netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface default server1.wendell 0.0.0.0 UG 0 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
(server1 is the older PowerEdge server running CentOS 5 that *presently* serves as the router to the public Internet and is also the dhcp and DNS server for the LAN. Eventually, the new T20 server will take that over, once it is fully set up.)
I have set up VMs like this on my CentOS 5 (Xen) machine without any problems, but I must be missing something here.