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Bullseye (Debian11) doesn't renew dhcp lease

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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

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Bullseye (Debian11) doesn't renew dhcp lease hans@hanswkraus.com - 2023-03-23 09:50 +0100
  Re: Bullseye (Debian11) doesn't renew dhcp lease hans@hanswkraus.com - 2023-03-23 13:00 +0100

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