This is a snippet of my network config. There is a TAP adapter that is part of Akamai EAA which provides secure access to my company's internal websites. The annoying thing is it exports a DNS server 100.64.0.1 which isn't a real DNS server.
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>ipconfig /all (irrelevant fields stripped from output)
Windows IP Configuration
Host Name . . . . . . . . . . . . : bar
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Peer-Peer
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : foo . com
Unknown adapter EAATAP:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : EAATAP secure Windows Adapter V9
IPv4 Address. . . . . . . . . . . : 100.64.0.1(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 100.64.0.1
Ethernet adapter LAN:
Connection-specific DNS Suffix . : foo.com
Description . . . . . . . . . . . : Intel(R) Ethernet Connection (7) I219-LM
IPv4 Address. . . . . . . . . . . : 192.168.0.12(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : June 20, 2021 8:52:07 PM
Lease Expires . . . . . . . . . . : June 24, 2021 8:52:08 AM
Default Gateway . . . . . . . . . : 192.168.0.254
DHCP Server . . . . . . . . . . . : 192.168.0.254
DNS Servers . . . . . . . . . . . : 192.168.0.254
1.1.1.1
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>"C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" list dhcpservers
NetworkName: MyNATNet
Dhcpd IP: 192.0.0.3
LowerIPAddress: 192.0.0.100
UpperIPAddress: 192.0.0.250
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
3/legacy: 192.0.0.1
6/legacy: 192.168.0.254 1.1.1.1
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>"C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" list dhcpservers
NetworkName: MyNATNet
Dhcpd IP: 192.0.0.3
LowerIPAddress: 192.0.0.100
UpperIPAddress: 192.0.0.250
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
3/legacy: 192.0.0.1
6/legacy: 100.64.0.1 192.168.0.254 1.1.1.1
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...
60:15:39.213620 Started NAT network 'MyNATNet'
60:15:39.213988 Saving settings file "E:\xxx.vbox" with version "1.17-windows"
60:15:43.136451 HostDnsMonitorProxy::GetNameServers:
60:15:43.136474 name server 1: 100.64.0.1
60:15:43.136486 name server 2: 192.168.0.254
60:15:43.136495 name server 3: 1.1.1.1
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VBoxManage.exe dhcpserver modify --network=MyNATNet --set-opt=6 "1.1.1.1 8.8.8.8"