weizhouapache opened a new issue, #7633:
URL: https://github.com/apache/cloudstack/issues/7633
Note: This issue is difficult to reproduce,but we do notice it in one
environment, which caused some issues.
When create a VM on isolated network, the mac address is generated by the
following method
```
@Override
public String getNextAvailableMacAddress(final long networkConfigId,
Integer zoneMacIdentifier) {
final SequenceFetcher fetch = SequenceFetcher.getInstance();
long seq = fetch.getNextSequence(Long.class, _tgMacAddress,
networkConfigId);
if(zoneMacIdentifier != null && zoneMacIdentifier.intValue() != 0 ){
seq = seq | _prefix << 40 | (long)zoneMacIdentifier << 32 |
networkConfigId << 16 & 0x00000000ffff0000l;
}
else {
seq = seq | _prefix << 40 | _rand.nextInt(Short.MAX_VALUE) << 16
& 0x00000000ffff0000l;
}
return NetUtils.long2Mac(seq);
}
```
It could happen that the mac addresses are duplicated in the same network or
among different networks.
Ideally the mac address should be unique in a zone.
##### ISSUE TYPE
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