Re: dhcp relay agent clarification wanted

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1. Yes, DHCP can distribute the DNS domain name. It is DHCP option 015.

2. The way it all works is a bit unusual . When a remote client connects, it
gets its IP config from the RRAS server as part of setting up the point to
point link. At this stage the client just gets an IP and the DNS and WINS
server addresses which are configured on the RRAS server. This is how it has
worked since RAS on NT, and is part of the PPP negotiation process.

After the connection is set up, the client (if it has the necessary
code) can contact the DHCP server and check for other DHCP options. For this
to work DHCP relay must be enabled on the RRAS server. The server doesn't
contact a particular IP address - it just sends a DHCPINFORM request.

I seem to recall previous postings where there have been problems with
this if the RRAS server is itself the DHCP server. I have never really
looked at this, since I have never had the need to use it.

bill tie wrote:
> Bill,
>
> Thank you for your comment.
>
>> ...specify the correct domain suffix
>> in the connection properties of the client.
>
> Yes, I've observed if I enter manually companyName.com in the "DNS
> suffix for this connection" box, a VPN roaming client is able to
> access the internal website using http://siteName in lieu of the
> full-blown http://siteName.companyName.com.
>
> Manual alterations would have to be made on every machine. Isn't
> there a way to distribute the domain suffix from the server?
>
> Is the DHCP Relay Agent just my delusion? The reason why I question
> my findings is that my tests are conducted in a controlled
> environment of a virtual-machine network.
>
> [1] ipconfig /all before installing DHCP Relay Agent
>
> Windows IP Configuration
> Host Name . . . . . . . . . . . . : roam-wrkstn
> Primary Dns Suffix . . . . . . . :
> Node Type . . . . . . . . . . . . : Mixed
> IP Routing Enabled. . . . . . . . : No
> WINS Proxy Enabled. . . . . . . . : No
>
> Ethernet adapter Local Area Connection:
> Connection-specific DNS Suffix . :
> Description . . . . . . . . . . . : Intel 21140-Based PCI Fast
> Ethernet Adapter (Generic)
> Physical Address. . . . . . . . . : 00-03-FF-15-45-26
> Dhcp Enabled. . . . . . . . . . . : No
> IP Address. . . . . . . . . . . . : 1.1.1.1
> Subnet Mask . . . . . . . . . . . : 255.255.255.0
> Default Gateway . . . . . . . . . : 172.16.1.1
>
> PPP adapter VPN Connection:
> Connection-specific DNS Suffix . :
> Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
> Physical Address. . . . . . . . . : 00-53-45-00-00-00
> Dhcp Enabled. . . . . . . . . . . : No
> IP Address. . . . . . . . . . . . : 10.1.0.11
> Subnet Mask . . . . . . . . . . . : 255.255.255.255
> Default Gateway . . . . . . . . . : 10.1.0.11
> DNS Servers . . . . . . . . . . . : 10.1.0.1
> - - - - - - - - - - - - - - - - - - - - - - -
> [2] ipconfig /all after installing DHCP Relay Agent
>
> Windows IP Configuration
> Host Name . . . . . . . . . . . . : roam-wrkstn
> Primary Dns Suffix . . . . . . . :
> Node Type . . . . . . . . . . . . : Mixed
> IP Routing Enabled. . . . . . . . : No
> WINS Proxy Enabled. . . . . . . . : No
> DNS Suffix Search List. . . . . . : companyName.com
>
> Ethernet adapter Local Area Connection:
> Connection-specific DNS Suffix . :
> Description . . . . . . . . . . . : Intel 21140-Based PCI Fast
> Ethernet Adapter (Generic)
> Physical Address. . . . . . . . . : 00-03-FF-15-45-26
> Dhcp Enabled. . . . . . . . . . . : No
> IP Address. . . . . . . . . . . . : 1.1.1.1
> Subnet Mask . . . . . . . . . . . : 255.255.255.0
> Default Gateway . . . . . . . . . : 172.16.1.1
>
> PPP adapter VPN Connection:
> Connection-specific DNS Suffix . : companyName.com
> Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
> Physical Address. . . . . . . . . : 00-53-45-00-00-00
> Dhcp Enabled. . . . . . . . . . . : No
> IP Address. . . . . . . . . . . . : 10.1.0.12
> Subnet Mask . . . . . . . . . . . : 255.255.255.255
> Default Gateway . . . . . . . . . : 10.1.0.12
> DNS Servers . . . . . . . . . . . : 10.1.0.1
> 10.1.0.1


.

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