| Hi, a pc with a plain vanilla Debian11 doesn't renew the dhcp lease automatically, I have to do it per hand (systemctl stop ifup@$1.service && systemctl start ifup@$1.service). The "/var/lib/dhcp/dhclient.lan0.leases" file:=======================================================
 default-duid "\000\001\000\001+\255\242Y|\020\311\235\007\"";
 lease {
 interface "lan0";
 fixed-address 172.23.139.11;
 option subnet-mask 255.255.248.0;
 option dhcp-lease-time 7200;
 option routers 172.23.136.1;
 option dhcp-message-type 5;
 option dhcp-server-identifier 172.23.136.1;
 option domain-name-servers 172.23.136.1;
 option domain-name "kraush.home.arpa";
 renew 3 2023/03/22 21:43:33;
 rebind 3 2023/03/22 22:28:58;
 expire 3 2023/03/22 22:43:58;
 }/etc/systemd/network/10-board-1G.link
 lease {
 interface "lan0";
 fixed-address 172.23.139.11;
 option subnet-mask 255.255.248.0;
 option routers 172.23.136.1;
 option dhcp-lease-time 7200;
 option dhcp-message-type 5;
 option domain-name-servers 172.23.136.1;
 option dhcp-server-identifier 172.23.136.1;
 option domain-name "kraush.home.arpa";
 renew 4 2023/03/23 09:02:59;
 rebind 4 2023/03/23 09:51:21;
 expire 4 2023/03/23 10:06:21;
 }
 =======================================================
 I don't run network manager, the configuration files:/etc/systemd/network/10-board-1G.link ==============================
 # RJ45, 1G, on board   [Match] MACAddress=7c:10:c9:9d:07:22   [Link] Name=lan0=======================================================
 
   
/etc/network/interfaces.d/lan0 ==================================== # /etc/network/interfaces.d/lan0   auto lan0 allow-hotplug lan0 iface lan0 inet dhcp iface lan0 inet6 dhcp =======================================================   Any help appreciated, Hans   |