Dear Maintainer,

debian-installer does not set use_tempaddr[1] for network interfaces it
brings up. If the machine Debian is installed on is connected to an IPv6
capable network, the source address used to download packages contains
the machines MAC address.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/networking/ip-sysctl.txt?h=v4.9#n1566