Re: RRAS clients not updating WINS / DNS

That is not really what the DHCP relay option is for. If your RRAS
server is on the same subnet as your DHCP server it wouldn't need a DHCP
relay agent anyway. But if your RRAS server is using APIPA addresses it is
not finding the DHCP server. There must be some other problem preventing it.

The DHCP relay agent is to allow the remote client to find a DHCP
server. The reason why you might want this isn't obvious. The remote client
does not get its network config from DHCP. It gets it from the RRAS server
itself as part of the PPP setup negotiation. That is why RRAS needs a static
address pool (or a pool of addresses which it leases from DHCP. If you stop
RRAS it should release these addresses and get a new batch when it
restarts).

After the connection is up, a client can get further DHCP options from a
DHCP server using a DHCPINFORM request. If the DHCP settings (eg DNS or WINS
addresses) are different from the ones it received from RRAS, the DHCP
server values override the originals. This is when you need the DHCP relay
agent if DHCP is not running on the same server as RRAS.

Also remember that you don't have to use either option for DNS or WINS
addresses. You can always hard code them on the clients if you need to.

Jaap de Koning wrote:
> A little update.
>
> While trying to figure out whats wrong, I've discovered something else
> that I find strange.
>
> If memory serves me well, doesn't RRAS claim 10 or so IP adresses in
> DHCP? I've converted RRAS from working with a static pool to DHCP, and
> now when people try to log on to the network I get event 20169 in my
> event viewer on the server. The clients are assigned a APIPA address
> and are unable to use any of the network resources (logically).
>
> The DHCP server is in the same subnet as my RRAS client, and is
> anwsering to all my local clients (including the RRAS server). Also
> there is enough free IP addresses in the DHCP scope. Also the DHCP
> relay agent is installed on the RRAS server.
>
> I'm at a loss here - I think that the DNS problems are linked to my
> DHCP problems, but still, when I use a static pool and do a ipconfig
> /registerdns on a client everything works.
>
> Any help is appreciated!
>
> cheers,
> Jaap de Koning


.

Relevant Pages

  • RE: VPN, RRAS & DHCP
    ... DHCP correctly bound to Internal NIC. ... ISA firewall client was not used by the VPN client computer ... Check the status of the local server. ... <only when RRAS is set to obtain IP address from DHCP server. ...
    (microsoft.public.windows.server.sbs)
  • Re: VPN Error 733, Event Log Error 20050 with SBS 2003 - revisited
    ... the RRAS servers network card is not configured as a DHCP ... this is the only DHCP server on the ... First please open Routing and Remote Access console. ...
    (microsoft.public.windows.server.sbs)
  • RE: VPN, RRAS & DHCP
    ... only when RRAS is set to obtain IP address from DHCP server. ... VPN connections subsequently fail again. ...
    (microsoft.public.windows.server.sbs)
  • Re: DHCP issues (solved!)
    ... Rerun the RRAS wizard and see if that fixes it. ... I had set up a new Firewall Policy on ISA called Block Forbidden ... have DHCP connectivity!! ... on the bottom it shows "Server Local Area Connection". ...
    (microsoft.public.windows.server.sbs)
  • Re: Adding a printer
    ... There are things I cannot answer in the NAT RRAS setup about DNS ... Since my last post I did enable the DHCP and I then rebooted the server. ... > and that you actually mean the Configure RRAS wizard in Win2k3.... ...
    (microsoft.public.windows.server.networking)
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