| Summary: | No "Mac address collision" error shows when guests with the same MAC address booted | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | tingting zheng <tzheng> |
| Component: | libvirt | Assignee: | Libvirt Maintainers <libvirt-maint> |
| Status: | CLOSED NOTABUG | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.0 | CC: | acathrow, bili, dallan, dyuan, honzhang, lcui, mzhan |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-11-11 15:22:21 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
It's unusual, but valid to assign multiple VMs with the same MAC. This behavior is not a bug. I should also add that the string "Mac address collision", afaik, does not appear in the libvirt code, so it's a reasonable question why virt-manager is prohibiting this use case. |
Description No "Mac address collision" error shows when guests with the same MAC address booted. When create a new guest from virt-manager,set the fixed MAC address as one which has been used by other guests,error will pop out: "Mac address collision":"The MAC address '*******' is in use by another virtual machine." Version: virt-manager-0.10.0-5.el7.noarch libvirt-1.1.1-11.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.Prepare 2 guest xml files,set the same mac address for interface part. 2.use # virsh define guest.xml to create 2 guests. 3.use # virsh start guest to boot 2 guests. 4.The issue also occurs to virtual networks,virtual networks with the same MAC address can be started without error. # virsh net-list --all Name State Autostart Persistent -------------------------------------------------- bridge-test active no yes default active yes yes # virsh net-dumpxml bridge-test <network> <name>bridge-test</name> <uuid>2387ed67-23a4-47d4-8227-fa6b0f861760</uuid> <forward mode='bridge'/> <bridge name='br0' /> <mac address='52:54:00:3B:78:35'/> </network> # virsh net-dumpxml default <network connections='3'> <name>default</name> <uuid>196809bf-6249-4800-8152-f9621265378c</uuid> <forward mode='nat'/> <bridge name='virbr0' stp='on' delay='0' /> <mac address='52:54:00:3B:78:35'/> <ip address='192.168.122.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.122.2' end='192.168.122.254' /> </dhcp> </ip> </network> Actual results： Both of the guests can be booted successfully without "Mac address collision" error. Expected results: Only 1 guest can be booted,when trying to boot the other guest with the same MAC address,"Mac address collision" error shows. Additional info: 1.When create a new guest from virt-manager,set the fixed MAC address as one which has been used by other guests,error will pop out: "Mac address collision":"The MAC address '*******' is in use by another virtual machine."