Hi, We are trying to configure IP allocation to AOVPN client through DHCP Server, somehow its not working. There are 2 NIC in VPN servers. ( 1 internal NIC facing towards internal Network and 1 External facing towards internet) Enabled DHCP option in IPv4 properties of VPN Server Selected internal NIC for obtaining DHCP,DNS Added DHCP Server's IP address in DHCP Relay agent Properties Selected internal NIC in DHCP relay agent When tried to connect VPN client, getting error as "Error in assigning inner ip address to initiator in tunnel mode" From the Netmon trace, could see the DHCP discover started from Server from source address assigned to inernal NIC of VPN Server but no progress after that. Its not moving to DHCP Offer state... Feel that traffic is not reaching to DHCP Server for DHCP request but not able to trace further. Tried with assigning static IP from VPN Server itself and it works fine. Only DHCP IP allocation to VPN client is not working. Pls suggest if anything is missed and appreciate any direction to fix the issue. Regards Mahesh

Hi, Welcome to our new Q&A platform. May I know whether your VPN server's internal network interface and DHCP server are on the same subnet. If yes, you don't need to configure a DHCP relay agent. Hope my answer will help you! ---Please Accept as answer if the reply is helpful--- Best Regards, Sunny

Did you resolve this Mahesh, I am having the same issue.

AOVPN Client IP assignment through DHCP Server

Mahesh Aralelemath 386

Hi,

We are trying to configure IP allocation to AOVPN client through DHCP Server, somehow its not working.

There are 2 NIC in VPN servers. ( 1 internal NIC facing towards internal Network and 1 External facing towards internet)
Enabled DHCP option in IPv4 properties of VPN Server
Selected internal NIC for obtaining DHCP,DNS
Added DHCP Server's IP address in DHCP Relay agent Properties
Selected internal NIC in DHCP relay agent
When tried to connect VPN client, getting error as "Error in assigning inner ip address to initiator in tunnel mode"
From the Netmon trace, could see the DHCP discover started from Server from source address assigned to inernal NIC of VPN Server but no progress after that. Its not moving to DHCP Offer state...
Feel that traffic is not reaching to DHCP Server for DHCP request but not able to trace further.
Tried with assigning static IP from VPN Server itself and it works fine.
Only DHCP IP allocation to VPN client is not working.

Pls suggest if anything is missed and appreciate any direction to fix the issue.

Regards
Mahesh

Sunny Qi 10,896 Reputation points Microsoft Vendor

2020-08-31T02:25:23.14+00:00

Just want to confirm the current situations.

Please feel free to let us know if you need further assistance.

2 answers

Sunny Qi 10,896 Reputation points Microsoft Vendor

2020-08-21T03:19:32.767+00:00

Hi,

Welcome to our new Q&A platform.

May I know whether your VPN server's internal network interface and DHCP server are on the same subnet. If yes, you don't need to configure a DHCP relay agent.

Hope my answer will help you!

---Please Accept as answer if the reply is helpful---

Best Regards,
Sunny
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Mahesh Aralelemath 386 Reputation points

2020-08-21T06:02:33.3+00:00

Hi Sunny,

VPN Server's internal network interface and DHCP Server are in different subnet. Hence configured DHCP relay agent.
Not sure where i am missing, our Network/Firewall team keeps on saying no restriction at there end.

Regards
Mahesh

Sunny Qi 10,896 Reputation points Microsoft Vendor

2020-08-25T11:06:13.867+00:00

Hi Mahesh,

Thanks for your update.

If the issue only occurred when VPN server obtained IP address from DHCP and there was no issue when manually assign IP address to VPN server, then the problem might be on the relay agent and DHCP server.

Please make sure that the Interface of the DHCP Relay Agent in Routing and Remote Access----IPv4 was selected same as the interface of the device that was in different subnet of DHCP server. (For example, DHCP was in Subnet 1, the device obtained IP address was in Subnet 2, then the Interface of DHCP Relay Agent should be selected as interface in Subnet 2.)

Hope my answer will help you.

---Please Accept as answer if the reply is helpful---

Best Regards,
Sunny

Mahesh Aralelemath 386 Reputation points

2020-08-26T06:22:16.203+00:00

Thanks Sunny,
Interface in DHCP Relay agent is selected as internal NIC which is forwarding the traffic to all internal resources like DHCP,DNS etc.
This interface is having the IP in the same range of DHCP scope configured for VPN clients.
DHCP Relay agent is configured because DHCP Server is in different subnet.

Regards
Mahesh

Sunny Qi 10,896 Reputation points Microsoft Vendor

2020-08-28T08:47:56.42+00:00

Thanks for your update. Regarding of your issue, could you please help confirm if the VPN server and DHCP Relay Agent were configured on the same machine? And whether the VPN server can obtain its' IP from DHCP successfully?
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sysadminjames 126 Reputation points

2020-10-03T13:54:44.533+00:00

Did you resolve this Mahesh, I am having the same issue.
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Mahesh Aralelemath 386 Reputation points

2020-10-05T05:47:01.023+00:00

No, couldn't find crack for this.
Continued to configure in RRAS Server only as builtin capability.
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