I _assume_ it is matching a MAC-address with an IPv4-address, the same combination each time,
but please confirm.
Yes, it is true.
* Which MAC-address in configured in "option Address Reservation"?
* Which MAC-address is in the DHCP requests?
MAC address of my phisical device (Realtek gigabit).
Fine, now tell more. :-)
* Using DHCP or manual provided IPv4 address?
* Which kernel version? (Kernel from Jessie or from Stretch?)
* MAC-address, HWaddr, that is shown by `ifconfig`,
please add kernel version.
When i install jessie, DHCP server (so, it is my router) provide correct ip as auto. I don't input ip-address manually.
Kernel version 3.16.
Jessie installer correct getting ip-address from reservation. And set name of eheternet card as "eth0", but Stretch can not getting ip-address in auto-mode from addresses reservation and this installer set name of device as "enp0s4".