I have shared networks with fixed and dynamic ip ranges within the same
shared network.
Set "deny unknown-clients" in static pool and "deny known-clients" in
dynamic pool. But if a client has dynamic ip and later set a fixed
address within the same shared-network, sometimes dhcp server give him
again a dynamic ip, not the static.

shared-network "net2" {

        subnet 182.16.20.128 netmask 255.255.255.192 {
            pool {
                range 182.16.20.129 182.16.20.189;
                deny unknown-clients;
            }

                authoritative;

                option          broadcast-address 182.16.20.191;
                option          routers 182.16.20.190;

        }


        subnet 192.168.120.128 netmask 255.255.255.192 {
            pool {
                range 192.168.120.129 192.168.120.189;
                deny known-clients;

            }

                authoritative;

                deny duplicates;

                option          broadcast-address 192.168.120.191;
                option          routers 192.168.120.190;

        }
}

host 182.16.20.161 { hardware ethernet 00:1c:23:aa:91:b2; fixed-address
182.16.20.161; }
host 182.16.20.162 { hardware ethernet 00:19:66:79:30:65; fixed-address
182.16.20.162; }
host 182.16.20.163 { hardware ethernet 00:23:54:3e:81:cb; fixed-address
182.16.20.163; }
host 182.16.20.164 { hardware ethernet 00:1c:25:94:15:cf; fixed-address
182.16.20.164; }

Dear submitter,

as the package isc-dhcp has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1143544

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)