with dnsmasq server setup:
$ ip -4 a show ens8
3: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP
group default qlen 1000
inet 1.2.3.1/24 scope global ens8
valid_lft forever preferred_lft forever
$ cat /etc/dnsmasq.d/test
interface=ens8
bind-dynamic
no-resolv
no-poll
domain=test,1.2.3.4/24
dhcp-range=test,1.2.3.100,1.2.3.199,1m
dhcp-host=52:54:00:f7:b2:99,1.2.3.50,1m
on the test system:
ubuntu@lp1831787-e:~$ dpkg -l systemd | grep ii
ii systemd 242-7ubuntu3.2 amd64 system and service manager
ubuntu@lp1831787-e:~$ ip -4 a show dev ens8
3: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP
group default qlen 1000
inet 1.2.3.50/24 brd 1.2.3.255 scope global dynamic ens8
valid_lft 106sec preferred_lft 106sec
ubuntu@lp1831787-e:~$ ip -4 r
default via 1.2.3.1 dev ens8 proto dhcp src 1.2.3.50 metric 1024
1.2.3.0/24 dev ens8 proto kernel scope link src 1.2.3.50
1.2.3.1 dev ens8 proto dhcp scope link src 1.2.3.50 metric 1024
then on dnsmasq server, change the test system addr to .60:
$ cat /etc/dnsmasq.d/test
interface=ens8
bind-dynamic
no-resolv
no-poll
domain=test,1.2.3.4/24
dhcp-range=test,1.2.3.100,1.2.3.199,1m
dhcp-host=52:54:00:f7:b2:99,1.2.3.60,1m
ubuntu@dhcp-test:~$ sudo systemctl restart dnsmasq
on test system, wait for dhcp lease to timeout:
ubuntu@lp1831787-e:~$ ip -4 a show dev ens8
3: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP
group default qlen 1000
inet 1.2.3.60/24 brd 1.2.3.255 scope global dynamic ens8
valid_lft 114sec preferred_lft 114sec
ubuntu@lp1831787-e:~$ ip -4 r
default via 1.2.3.1 dev ens8 proto dhcp src 1.2.3.60 metric 1024
1.2.3.0/24 dev ens8 proto kernel scope link src 1.2.3.60
1.2.3.1 dev ens8 proto dhcp scope link src 1.2.3.60 metric 1024
** Tags removed: verification-needed verification-needed-eoan
** Tags added: verification-done verification-done-eoan
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https://bugs.launchpad.net/bugs/1831787
Title:
Bogus routes after DHCP lease change
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