First of all im french, as you can know we don't speak english well so please be kind with me

I need your help because i made some search to solve my problem but i didn't find anything or im not sure it could works.
I have a surebackup job wich always fail because, one of the VM (debian 4.0

In Vsphere i saw VM Tools activated.
I configured a DHCP range for this vlan (i tested it and it works with an other VM in this vlan) but with the VM (in the surebackup) it doesn't works.
I saw that i can turn MAC ADDRESS in manual mod in VSphere but i would try the other way before changing this setting.
Im affraid to change the MAC ADDRESS mode and make this VM unusable.
Someone can help me if you succeed to read and understand all i wrote

Thanks you a lot.