vboxmanage dhcpserver 添加但客户端无法获取 DHCP ip

这是我在主机操作系统中使用的命令，不幸的是客户操作系统仍然无法获取 DHCP ip。

两个操作系统都在 Linux 中运行。

wolf@linux:~$ vboxmanage dhcpserver add --network=malfoy --server-ip=10.38.1.1 --lower-ip=10.38.1.110 --upper-ip=10.38.1.120 --netmask=255.255.255.0 --enable
wolf@linux:~$ 

确认

wolf@linux:~$ vboxmanage list dhcpservers
NetworkName:    malfoy
Dhcpd IP:       10.38.1.1
LowerIPAddress: 10.38.1.110
UpperIPAddress: 10.38.1.120
NetworkMask:    255.255.255.0
Enabled:        Yes
Global Configuration:
    minLeaseTime:     default
    defaultLeaseTime: default
    maxLeaseTime:     default
    Forced options:   None
    Suppressed opts.: None
        1/legacy: 255.255.255.0
Groups:               None
Individual Configs:   None
wolf@linux:~$ 

来宾操作系统

guestOS$ ip a s enp0s3
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:aa:aa:aa brd ff:ff:ff:ff:ff:ff
guestOS$ 

guestOS$ sudo dhclient enp0s3 -v
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/enp0s3/08:00:27:aa:aa:aa
Sending on   LPF/enp0s3/08:00:27:aa:aa:aa
Sending on   Socket/fallback
DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 3 (xid=0xc1337)
DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 7 (xid=0xc1337)
DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 10 (xid=0xc1337)
...
DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 8 (xid=0xc1337)
DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 11 (xid=0xc1337)
DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 14 (xid=0xc1337)
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
guestOS$ 

参考：

https://progmar.net.pl/en/knowledge-base/virtualbox-adding-dhcp-server

https://www.youtube.com/watch?v=mvsiuLzpx2E

如何解决此问题？