A ne rien n'y comprendre....
Avec dhclient je release puis demande une nouvelle IP....
dhclient m'indique que l'IP obtenue est 192.168.1.47
[azerty@linux ~]$ sudo dhclient -v -r enp5s0
Killed old client process
Internet Systems Consortium DHCP Client 4.3.3-P1
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/enp5s0/00:24:1d:aa:bb:cc
Sending on LPF/enp5s0/00:24:1d:aa:bb:cc
Sending on Socket/fallback
DHCPRELEASE on enp5s0 to 192.168.1.1 port 67 (xid=0xf2aabbcc)
[azerty@linux ~]$ sudo dhclient -v enp5s0
Internet Systems Consortium DHCP Client 4.3.3-P1
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/enp5s0/00:24:1d:aa:bb:cc
Sending on LPF/enp5s0/00:24:1d:aa:bb:cc
Sending on Socket/fallback
DHCPDISCOVER on enp5s0 to 255.255.255.255 port 67 interval 6 (xid=0x45aabbcc)
DHCPREQUEST on enp5s0 to 255.255.255.255 port 67 (xid=0x45aabbcc)
DHCPOFFER from 192.168.1.1
DHCPACK from 192.168.1.1 (xid=0x45aabbcc)
bound to 192.168.1.47 -- renewal in 40081 seconds.
[didier@linux ~]$
Mais après cette manip ifconfig m'indique toujours que l'IP est 192.168.1.44
[azerty@linux ~]$ sudo ifconfig enp5s0
enp5s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.44 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::224:aaaa:bbbb:cccc prefixlen 64 scopeid 0x20<link>
ether 00:24:1d:aa:bb:cc txqueuelen 1000 (Ethernet)
RX packets 7674 bytes 4981333 (4.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6286 bytes 833249 (813.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0