VPN/DNS issue

[leadtheway]

Setup Client VPN on MX100..connects fine. Specified nameservers for the DNS servers for AD domain.   Confirmed that when connected its getting those dns servers. However can't resolve dns to ip. Am I missing something.. I can ping the dns servers from the mx fine.

[Nash · Accepted solution]

Are you using servername.domain.local (fqdn), or are you just trying to talk to servername?

You'll need to be using the fully qualified domain name, as opposed to a short NetBIOS-y name. 

[PhilipDAth]

Can you ping the DNS servers by using their IP address?

[MichaelPollard]

Same issue here. DNS is going to the router-assigned DNS servers, not the VPN-assigned servers.

Specific example, with confidential info replaced:

C:\Users\*****>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : *****
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : lan

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Intel(R) Ethernet Connection (7) I219-LM
Physical Address. . . . . . . . . : <MAC address>
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::3c38:d255:d9cb:8968%17(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.86.41(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Monday, October 4, 2021 6:39:38 PM
Lease Expires . . . . . . . . . . : Thursday, October 7, 2021 3:45:10 AM
Default Gateway . . . . . . . . . : 192.168.86.1
DHCP Server . . . . . . . . . . . : 192.168.86.1
DHCPv6 IAID . . . . . . . . . . . : 115627240
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-25-6F-DB-E4-E4-54-E8-74-6F-FD
DNS Servers . . . . . . . . . . . : 192.168.86.1
NetBIOS over Tcpip. . . . . . . . : Enabled

PPP adapter <The VPN connection name>:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : <The VPN connection name>
Physical Address. . . . . . . . . :
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : <DHCP address assigned by the MX100>(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : <Internal DNS server 1>
<Internal DNS server 2>
NetBIOS over Tcpip. . . . . . . . : Enabled

C:\Users\*****>nslookup <website>.com
Server: UnKnown
Address: 192.168.86.1

Non-authoritative answer:
Name: <website>.com
Address: <public address>

C:\Users\*****>ping <Internal DNS server 1>

Pinging <Internal DNS server 1> with 32 bytes of data:
Reply from <Internal DNS server 1>: bytes=32 time=4ms TTL=125
Reply from <Internal DNS server 1>: bytes=32 time=3ms TTL=125
Reply from <Internal DNS server 1>: bytes=32 time=16ms TTL=125
Reply from <Internal DNS server 1>: bytes=32 time=4ms TTL=125

Ping statistics for <Internal DNS server 1>:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 3ms, Maximum = 16ms, Average = 6ms