Relaying DHCP request on 2003 Server, challenge!

Were having problems creating the following scenario.

Windows Server 2003:
Int1: 10.6.0.1
255.255.224.0
Int2: 10.6.128.2
225.225.224.0

Server is acting as router with RRAS installed.
DHCP relay is configured to listen in Int2
DHCP relay is configured to send request to DHCP server with IP: 10.6.0.2
wich is in network connected to Int1

What i want is for clients connected to the subnet on Int2 to recieve a IP
from DHCP server in subnet connected to Int1. For this i installed DHCP relay
on the server.
Is this at all possible??
I notice that requests never make it to the DHCP server connected to the
subnet on Int1.

Any help is realy appreciated.


Joris van der Struijk

Ok, i'v fixed that problem by configuring a right scope.

Next major problem that's bothering me the whole day.

The DHCP server has to be placed behind a Windows 2003 server with router
functionality. This server will be promoted to an ISA server later in the
project. First we have to setup the connection properly.

I'v setup a 3600 router with the approperiate "ip helper-address
xx.xx.xx.xx" command to forward DHCP request trough the router. This works.

The DHCP server that's going to serve the IP-addresses is placed behind a
Windows 2003 server with DHCP-relay installed.
Interface 1 of the Windows 2003 Router is connected to the Cisco router,
interface 2 is connected to the subnet where the DHCP server resides. This
Windows 2003 router has to forward the already forwarded DHCP request (by the
ciscro router) to the correct DHCP server.

That's the problem, i don't know how to let Windows 2003 correctly forward
the Cisco router's DHCP request.

HELP

"Joris van der Struijk" schreef:

> Were having problems creating the following scenario.
>
> Windows Server 2003:
> Int1: 10.6.0.1
> 255.255.224.0
> Int2: 10.6.128.2
> 225.225.224.0
>
> Server is acting as router with RRAS installed.
> DHCP relay is configured to listen in Int2
> DHCP relay is configured to send request to DHCP server with IP: 10.6.0.2
> wich is in network connected to Int1
>
> What i want is for clients connected to the subnet on Int2 to recieve a IP
> from DHCP server in subnet connected to Int1. For this i installed DHCP relay
> on the server.
> Is this at all possible??
> I notice that requests never make it to the DHCP server connected to the
> subnet on Int1.
>
> Any help is realy appreciated.

'Probably' this is not an issue. You can forward through multiple Relay
Agents. The initial relay should construct a directed packet in which the
header includes the IP of the interface upon which the discover broadcast
was received. The DHCP server will offer an address from a scope which
matches the IP in the header. You may have an issue if the server is
running NAT:

http://technet2.microsoft.com/Window...5-7247-4759-8d
6e-e400f77424651033.mspx

Doug Sherman
MCSE, MCSA, MCP+I, MVP

"Joris van der Struijk" <(E-Mail Removed)> wrote
in message news:A2E849C1-5173-475C-800C-(E-Mail Removed)...
> Ok, i'v fixed that problem by configuring a right scope.
>
> Next major problem that's bothering me the whole day.
>
> The DHCP server has to be placed behind a Windows 2003 server with router
> functionality. This server will be promoted to an ISA server later in the
> project. First we have to setup the connection properly.
>
> I'v setup a 3600 router with the approperiate "ip helper-address
> xx.xx.xx.xx" command to forward DHCP request trough the router. This
works.
>
> The DHCP server that's going to serve the IP-addresses is placed behind a
> Windows 2003 server with DHCP-relay installed.
> Interface 1 of the Windows 2003 Router is connected to the Cisco router,
> interface 2 is connected to the subnet where the DHCP server resides. This
> Windows 2003 router has to forward the already forwarded DHCP request (by
the
> ciscro router) to the correct DHCP server.
>
> That's the problem, i don't know how to let Windows 2003 correctly forward
> the Cisco router's DHCP request.
>
> HELP
>
> "Joris van der Struijk" schreef:
>
> > Were having problems creating the following scenario.
> >
> > Windows Server 2003:
> > Int1: 10.6.0.1
> > 255.255.224.0
> > Int2: 10.6.128.2
> > 225.225.224.0
> >
> > Server is acting as router with RRAS installed.
> > DHCP relay is configured to listen in Int2
> > DHCP relay is configured to send request to DHCP server with IP:
10.6.0.2
> > wich is in network connected to Int1
> >
> > What i want is for clients connected to the subnet on Int2 to recieve a
IP
> > from DHCP server in subnet connected to Int1. For this i installed DHCP
relay
> > on the server.
> > Is this at all possible??
> > I notice that requests never make it to the DHCP server connected to the
> > subnet on Int1.
> >
> > Any help is realy appreciated.

I don't exacltly get what you mean.

What i think at the moment is that i don't need to install Relay agent on
the W2K3 server but only need to correctly setup routing on the server.

The Cisco router is configured to act as Relay agent, so it uses unicast to
contact the DHCP server. This unicast only needs te be rerouted through the
W2K3 server to access the DHCP server, am i right or completly wrong? Couse
this isn't working.

But when you say that the relay agent of the Windows server is able to
forward the request, how do i setup this scenario? I'v tried my best and im
lockup right now and could realy need some help.

"Doug Sherman [MVP]" schreef:

> 'Probably' this is not an issue. You can forward through multiple Relay
> Agents. The initial relay should construct a directed packet in which the
> header includes the IP of the interface upon which the discover broadcast
> was received. The DHCP server will offer an address from a scope which
> matches the IP in the header. You may have an issue if the server is
> running NAT:
>
> http://technet2.microsoft.com/Window...5-7247-4759-8d
> 6e-e400f77424651033.mspx
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
> "Joris van der Struijk" <(E-Mail Removed)> wrote
> in message news:A2E849C1-5173-475C-800C-(E-Mail Removed)...
> > Ok, i'v fixed that problem by configuring a right scope.
> >
> > Next major problem that's bothering me the whole day.
> >
> > The DHCP server has to be placed behind a Windows 2003 server with router
> > functionality. This server will be promoted to an ISA server later in the
> > project. First we have to setup the connection properly.
> >
> > I'v setup a 3600 router with the approperiate "ip helper-address
> > xx.xx.xx.xx" command to forward DHCP request trough the router. This
> works.
> >
> > The DHCP server that's going to serve the IP-addresses is placed behind a
> > Windows 2003 server with DHCP-relay installed.
> > Interface 1 of the Windows 2003 Router is connected to the Cisco router,
> > interface 2 is connected to the subnet where the DHCP server resides. This
> > Windows 2003 router has to forward the already forwarded DHCP request (by
> the
> > ciscro router) to the correct DHCP server.
> >
> > That's the problem, i don't know how to let Windows 2003 correctly forward
> > the Cisco router's DHCP request.
> >
> > HELP
> >
> > "Joris van der Struijk" schreef:
> >
> > > Were having problems creating the following scenario.
> > >
> > > Windows Server 2003:
> > > Int1: 10.6.0.1
> > > 255.255.224.0
> > > Int2: 10.6.128.2
> > > 225.225.224.0
> > >
> > > Server is acting as router with RRAS installed.
> > > DHCP relay is configured to listen in Int2
> > > DHCP relay is configured to send request to DHCP server with IP:
> 10.6.0.2
> > > wich is in network connected to Int1
> > >
> > > What i want is for clients connected to the subnet on Int2 to recieve a
> IP
> > > from DHCP server in subnet connected to Int1. For this i installed DHCP
> relay
> > > on the server.
> > > Is this at all possible??
> > > I notice that requests never make it to the DHCP server connected to the
> > > subnet on Int1.
> > >
> > > Any help is realy appreciated.
>
>
>

Well, now I'm confused too. I thought you were trying to use a Relay Agent
on the Windows server: "Windows 2003 server with DHCP-relay installed."

Anyway, as long as LAN routing is enabled, the Cisco device should be able
to forward directly to the DHCP server. However, the Cisco device needs a
default gateway or route to the DHCP server's subnet AND the DHCP server
needs a default gateway or route to the Cisco device.

Doug Sherman
MCSE, MCSA, MCP+I, MVP

"Joris van der Struijk" <(E-Mail Removed)> wrote
in message news:AF263A27-E7C3-4777-B7A7-(E-Mail Removed)...
> I don't exacltly get what you mean.
>
> What i think at the moment is that i don't need to install Relay agent on
> the W2K3 server but only need to correctly setup routing on the server.
>
> The Cisco router is configured to act as Relay agent, so it uses unicast
to
> contact the DHCP server. This unicast only needs te be rerouted through
the
> W2K3 server to access the DHCP server, am i right or completly wrong?
Couse
> this isn't working.
>
> But when you say that the relay agent of the Windows server is able to
> forward the request, how do i setup this scenario? I'v tried my best and
im
> lockup right now and could realy need some help.
>
> "Doug Sherman [MVP]" schreef:
>
> > 'Probably' this is not an issue. You can forward through multiple Relay
> > Agents. The initial relay should construct a directed packet in which
the
> > header includes the IP of the interface upon which the discover
broadcast
> > was received. The DHCP server will offer an address from a scope which
> > matches the IP in the header. You may have an issue if the server is
> > running NAT:
> >
> >
http://technet2.microsoft.com/Window...5-7247-4759-8d
> > 6e-e400f77424651033.mspx
> >
> > Doug Sherman
> > MCSE, MCSA, MCP+I, MVP
> >
> > "Joris van der Struijk" <(E-Mail Removed)>
wrote
> > in message news:A2E849C1-5173-475C-800C-(E-Mail Removed)...
> > > Ok, i'v fixed that problem by configuring a right scope.
> > >
> > > Next major problem that's bothering me the whole day.
> > >
> > > The DHCP server has to be placed behind a Windows 2003 server with
router
> > > functionality. This server will be promoted to an ISA server later in
the
> > > project. First we have to setup the connection properly.
> > >
> > > I'v setup a 3600 router with the approperiate "ip helper-address
> > > xx.xx.xx.xx" command to forward DHCP request trough the router. This
> > works.
> > >
> > > The DHCP server that's going to serve the IP-addresses is placed
behind a
> > > Windows 2003 server with DHCP-relay installed.
> > > Interface 1 of the Windows 2003 Router is connected to the Cisco
router,
> > > interface 2 is connected to the subnet where the DHCP server resides.
This
> > > Windows 2003 router has to forward the already forwarded DHCP request
(by
> > the
> > > ciscro router) to the correct DHCP server.
> > >
> > > That's the problem, i don't know how to let Windows 2003 correctly
forward
> > > the Cisco router's DHCP request.
> > >
> > > HELP
> > >
> > > "Joris van der Struijk" schreef:
> > >
> > > > Were having problems creating the following scenario.
> > > >
> > > > Windows Server 2003:
> > > > Int1: 10.6.0.1
> > > > 255.255.224.0
> > > > Int2: 10.6.128.2
> > > > 225.225.224.0
> > > >
> > > > Server is acting as router with RRAS installed.
> > > > DHCP relay is configured to listen in Int2
> > > > DHCP relay is configured to send request to DHCP server with IP:
> > 10.6.0.2
> > > > wich is in network connected to Int1
> > > >
> > > > What i want is for clients connected to the subnet on Int2 to
recieve a
> > IP
> > > > from DHCP server in subnet connected to Int1. For this i installed
DHCP
> > relay
> > > > on the server.
> > > > Is this at all possible??
> > > > I notice that requests never make it to the DHCP server connected to
the
> > > > subnet on Int1.
> > > >
> > > > Any help is realy appreciated.
> >
> >
> >

Sorry to have you confused.

What i realy mean is that i don't realy care how i have to setup the server
acting as router. If it has to be trough using a Windows Relay agent to
forward the relayed request then this is what i implement. But if i only need
to configure routing on the Windows server and this also works, then why not
use this method (less configuring)?



"Doug Sherman [MVP]" schreef:

> Well, now I'm confused too. I thought you were trying to use a Relay Agent
> on the Windows server: "Windows 2003 server with DHCP-relay installed."
>
> Anyway, as long as LAN routing is enabled, the Cisco device should be able
> to forward directly to the DHCP server. However, the Cisco device needs a
> default gateway or route to the DHCP server's subnet AND the DHCP server
> needs a default gateway or route to the Cisco device.
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
> "Joris van der Struijk" <(E-Mail Removed)> wrote
> in message news:AF263A27-E7C3-4777-B7A7-(E-Mail Removed)...
> > I don't exacltly get what you mean.
> >
> > What i think at the moment is that i don't need to install Relay agent on
> > the W2K3 server but only need to correctly setup routing on the server.
> >
> > The Cisco router is configured to act as Relay agent, so it uses unicast
> to
> > contact the DHCP server. This unicast only needs te be rerouted through
> the
> > W2K3 server to access the DHCP server, am i right or completly wrong?
> Couse
> > this isn't working.
> >
> > But when you say that the relay agent of the Windows server is able to
> > forward the request, how do i setup this scenario? I'v tried my best and
> im
> > lockup right now and could realy need some help.
> >
> > "Doug Sherman [MVP]" schreef:
> >
> > > 'Probably' this is not an issue. You can forward through multiple Relay
> > > Agents. The initial relay should construct a directed packet in which
> the
> > > header includes the IP of the interface upon which the discover
> broadcast
> > > was received. The DHCP server will offer an address from a scope which
> > > matches the IP in the header. You may have an issue if the server is
> > > running NAT:
> > >
> > >
> http://technet2.microsoft.com/Window...5-7247-4759-8d
> > > 6e-e400f77424651033.mspx
> > >
> > > Doug Sherman
> > > MCSE, MCSA, MCP+I, MVP
> > >
> > > "Joris van der Struijk" <(E-Mail Removed)>
> wrote
> > > in message news:A2E849C1-5173-475C-800C-(E-Mail Removed)...
> > > > Ok, i'v fixed that problem by configuring a right scope.
> > > >
> > > > Next major problem that's bothering me the whole day.
> > > >
> > > > The DHCP server has to be placed behind a Windows 2003 server with
> router
> > > > functionality. This server will be promoted to an ISA server later in
> the
> > > > project. First we have to setup the connection properly.
> > > >
> > > > I'v setup a 3600 router with the approperiate "ip helper-address
> > > > xx.xx.xx.xx" command to forward DHCP request trough the router. This
> > > works.
> > > >
> > > > The DHCP server that's going to serve the IP-addresses is placed
> behind a
> > > > Windows 2003 server with DHCP-relay installed.
> > > > Interface 1 of the Windows 2003 Router is connected to the Cisco
> router,
> > > > interface 2 is connected to the subnet where the DHCP server resides.
> This
> > > > Windows 2003 router has to forward the already forwarded DHCP request
> (by
> > > the
> > > > ciscro router) to the correct DHCP server.
> > > >
> > > > That's the problem, i don't know how to let Windows 2003 correctly
> forward
> > > > the Cisco router's DHCP request.
> > > >
> > > > HELP
> > > >
> > > > "Joris van der Struijk" schreef:
> > > >
> > > > > Were having problems creating the following scenario.
> > > > >
> > > > > Windows Server 2003:
> > > > > Int1: 10.6.0.1
> > > > > 255.255.224.0
> > > > > Int2: 10.6.128.2
> > > > > 225.225.224.0
> > > > >
> > > > > Server is acting as router with RRAS installed.
> > > > > DHCP relay is configured to listen in Int2
> > > > > DHCP relay is configured to send request to DHCP server with IP:
> > > 10.6.0.2
> > > > > wich is in network connected to Int1
> > > > >
> > > > > What i want is for clients connected to the subnet on Int2 to
> recieve a
> > > IP
> > > > > from DHCP server in subnet connected to Int1. For this i installed
> DHCP
> > > relay
> > > > > on the server.
> > > > > Is this at all possible??
> > > > > I notice that requests never make it to the DHCP server connected to
> the
> > > > > subnet on Int1.
> > > > >
> > > > > Any help is realy appreciated.
> > >
> > >
> > >
>
>
>

THe routes are correct now.
It looks like the DHCP server isn't responding to the forwarded dhsp request.
Anything extra i need to configure?

"Doug Sherman [MVP]" schreef:

> Well, now I'm confused too. I thought you were trying to use a Relay Agent
> on the Windows server: "Windows 2003 server with DHCP-relay installed."
>
> Anyway, as long as LAN routing is enabled, the Cisco device should be able
> to forward directly to the DHCP server. However, the Cisco device needs a
> default gateway or route to the DHCP server's subnet AND the DHCP server
> needs a default gateway or route to the Cisco device.
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
> "Joris van der Struijk" <(E-Mail Removed)> wrote
> in message news:AF263A27-E7C3-4777-B7A7-(E-Mail Removed)...
> > I don't exacltly get what you mean.
> >
> > What i think at the moment is that i don't need to install Relay agent on
> > the W2K3 server but only need to correctly setup routing on the server.
> >
> > The Cisco router is configured to act as Relay agent, so it uses unicast
> to
> > contact the DHCP server. This unicast only needs te be rerouted through
> the
> > W2K3 server to access the DHCP server, am i right or completly wrong?
> Couse
> > this isn't working.
> >
> > But when you say that the relay agent of the Windows server is able to
> > forward the request, how do i setup this scenario? I'v tried my best and
> im
> > lockup right now and could realy need some help.
> >
> > "Doug Sherman [MVP]" schreef:
> >
> > > 'Probably' this is not an issue. You can forward through multiple Relay
> > > Agents. The initial relay should construct a directed packet in which
> the
> > > header includes the IP of the interface upon which the discover
> broadcast
> > > was received. The DHCP server will offer an address from a scope which
> > > matches the IP in the header. You may have an issue if the server is
> > > running NAT:
> > >
> > >
> http://technet2.microsoft.com/Window...5-7247-4759-8d
> > > 6e-e400f77424651033.mspx
> > >
> > > Doug Sherman
> > > MCSE, MCSA, MCP+I, MVP
> > >
> > > "Joris van der Struijk" <(E-Mail Removed)>
> wrote
> > > in message news:A2E849C1-5173-475C-800C-(E-Mail Removed)...
> > > > Ok, i'v fixed that problem by configuring a right scope.
> > > >
> > > > Next major problem that's bothering me the whole day.
> > > >
> > > > The DHCP server has to be placed behind a Windows 2003 server with
> router
> > > > functionality. This server will be promoted to an ISA server later in
> the
> > > > project. First we have to setup the connection properly.
> > > >
> > > > I'v setup a 3600 router with the approperiate "ip helper-address
> > > > xx.xx.xx.xx" command to forward DHCP request trough the router. This
> > > works.
> > > >
> > > > The DHCP server that's going to serve the IP-addresses is placed
> behind a
> > > > Windows 2003 server with DHCP-relay installed.
> > > > Interface 1 of the Windows 2003 Router is connected to the Cisco
> router,
> > > > interface 2 is connected to the subnet where the DHCP server resides.
> This
> > > > Windows 2003 router has to forward the already forwarded DHCP request
> (by
> > > the
> > > > ciscro router) to the correct DHCP server.
> > > >
> > > > That's the problem, i don't know how to let Windows 2003 correctly
> forward
> > > > the Cisco router's DHCP request.
> > > >
> > > > HELP
> > > >
> > > > "Joris van der Struijk" schreef:
> > > >
> > > > > Were having problems creating the following scenario.
> > > > >
> > > > > Windows Server 2003:
> > > > > Int1: 10.6.0.1
> > > > > 255.255.224.0
> > > > > Int2: 10.6.128.2
> > > > > 225.225.224.0
> > > > >
> > > > > Server is acting as router with RRAS installed.
> > > > > DHCP relay is configured to listen in Int2
> > > > > DHCP relay is configured to send request to DHCP server with IP:
> > > 10.6.0.2
> > > > > wich is in network connected to Int1
> > > > >
> > > > > What i want is for clients connected to the subnet on Int2 to
> recieve a
> > > IP
> > > > > from DHCP server in subnet connected to Int1. For this i installed
> DHCP
> > > relay
> > > > > on the server.
> > > > > Is this at all possible??
> > > > > I notice that requests never make it to the DHCP server connected to
> the
> > > > > subnet on Int1.
> > > > >
> > > > > Any help is realy appreciated.
> > >
> > >
> > >
>
>
>

Were monitoring the DHCP server right now and it recieves DHCPdiscover
packets from the Cisco relaying router and nothing else. No offer, nothing.
What could be the problem of this?

"Doug Sherman [MVP]" schreef:

> Well, now I'm confused too. I thought you were trying to use a Relay Agent
> on the Windows server: "Windows 2003 server with DHCP-relay installed."
>
> Anyway, as long as LAN routing is enabled, the Cisco device should be able
> to forward directly to the DHCP server. However, the Cisco device needs a
> default gateway or route to the DHCP server's subnet AND the DHCP server
> needs a default gateway or route to the Cisco device.
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
> "Joris van der Struijk" <(E-Mail Removed)> wrote
> in message news:AF263A27-E7C3-4777-B7A7-(E-Mail Removed)...
> > I don't exacltly get what you mean.
> >
> > What i think at the moment is that i don't need to install Relay agent on
> > the W2K3 server but only need to correctly setup routing on the server.
> >
> > The Cisco router is configured to act as Relay agent, so it uses unicast
> to
> > contact the DHCP server. This unicast only needs te be rerouted through
> the
> > W2K3 server to access the DHCP server, am i right or completly wrong?
> Couse
> > this isn't working.
> >
> > But when you say that the relay agent of the Windows server is able to
> > forward the request, how do i setup this scenario? I'v tried my best and
> im
> > lockup right now and could realy need some help.
> >
> > "Doug Sherman [MVP]" schreef:
> >
> > > 'Probably' this is not an issue. You can forward through multiple Relay
> > > Agents. The initial relay should construct a directed packet in which
> the
> > > header includes the IP of the interface upon which the discover
> broadcast
> > > was received. The DHCP server will offer an address from a scope which
> > > matches the IP in the header. You may have an issue if the server is
> > > running NAT:
> > >
> > >
> http://technet2.microsoft.com/Window...5-7247-4759-8d
> > > 6e-e400f77424651033.mspx
> > >
> > > Doug Sherman
> > > MCSE, MCSA, MCP+I, MVP
> > >
> > > "Joris van der Struijk" <(E-Mail Removed)>
> wrote
> > > in message news:A2E849C1-5173-475C-800C-(E-Mail Removed)...
> > > > Ok, i'v fixed that problem by configuring a right scope.
> > > >
> > > > Next major problem that's bothering me the whole day.
> > > >
> > > > The DHCP server has to be placed behind a Windows 2003 server with
> router
> > > > functionality. This server will be promoted to an ISA server later in
> the
> > > > project. First we have to setup the connection properly.
> > > >
> > > > I'v setup a 3600 router with the approperiate "ip helper-address
> > > > xx.xx.xx.xx" command to forward DHCP request trough the router. This
> > > works.
> > > >
> > > > The DHCP server that's going to serve the IP-addresses is placed
> behind a
> > > > Windows 2003 server with DHCP-relay installed.
> > > > Interface 1 of the Windows 2003 Router is connected to the Cisco
> router,
> > > > interface 2 is connected to the subnet where the DHCP server resides.
> This
> > > > Windows 2003 router has to forward the already forwarded DHCP request
> (by
> > > the
> > > > ciscro router) to the correct DHCP server.
> > > >
> > > > That's the problem, i don't know how to let Windows 2003 correctly
> forward
> > > > the Cisco router's DHCP request.
> > > >
> > > > HELP
> > > >
> > > > "Joris van der Struijk" schreef:
> > > >
> > > > > Were having problems creating the following scenario.
> > > > >
> > > > > Windows Server 2003:
> > > > > Int1: 10.6.0.1
> > > > > 255.255.224.0
> > > > > Int2: 10.6.128.2
> > > > > 225.225.224.0
> > > > >
> > > > > Server is acting as router with RRAS installed.
> > > > > DHCP relay is configured to listen in Int2
> > > > > DHCP relay is configured to send request to DHCP server with IP:
> > > 10.6.0.2
> > > > > wich is in network connected to Int1
> > > > >
> > > > > What i want is for clients connected to the subnet on Int2 to
> recieve a
> > > IP
> > > > > from DHCP server in subnet connected to Int1. For this i installed
> DHCP
> > > relay
> > > > > on the server.
> > > > > Is this at all possible??
> > > > > I notice that requests never make it to the DHCP server connected to
> the
> > > > > subnet on Int1.
> > > > >
> > > > > Any help is realy appreciated.
> > >
> > >
> > >
>
>
>

I'v run Ethereal on the Windows router and it shows the following:

Broadcast from Cisco Router, Protocol ARP, Info: Who has 10.6.0.2? Tell
10.6.128.1.
Reply on interface loop from the Cisco Router.

Nothing else.

10.6.0.2 is the IP of the DHCP server.
10.6.128.1 is the interface of the Cisco router connected to the Windows
router.

Why isn't the Windows router responding to the requests of the Cisco router?


"Doug Sherman [MVP]" schreef:

> Well, now I'm confused too. I thought you were trying to use a Relay Agent
> on the Windows server: "Windows 2003 server with DHCP-relay installed."
>
> Anyway, as long as LAN routing is enabled, the Cisco device should be able
> to forward directly to the DHCP server. However, the Cisco device needs a
> default gateway or route to the DHCP server's subnet AND the DHCP server
> needs a default gateway or route to the Cisco device.
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
> "Joris van der Struijk" <(E-Mail Removed)> wrote
> in message news:AF263A27-E7C3-4777-B7A7-(E-Mail Removed)...
> > I don't exacltly get what you mean.
> >
> > What i think at the moment is that i don't need to install Relay agent on
> > the W2K3 server but only need to correctly setup routing on the server.
> >
> > The Cisco router is configured to act as Relay agent, so it uses unicast
> to
> > contact the DHCP server. This unicast only needs te be rerouted through
> the
> > W2K3 server to access the DHCP server, am i right or completly wrong?
> Couse
> > this isn't working.
> >
> > But when you say that the relay agent of the Windows server is able to
> > forward the request, how do i setup this scenario? I'v tried my best and
> im
> > lockup right now and could realy need some help.
> >
> > "Doug Sherman [MVP]" schreef:
> >
> > > 'Probably' this is not an issue. You can forward through multiple Relay
> > > Agents. The initial relay should construct a directed packet in which
> the
> > > header includes the IP of the interface upon which the discover
> broadcast
> > > was received. The DHCP server will offer an address from a scope which
> > > matches the IP in the header. You may have an issue if the server is
> > > running NAT:
> > >
> > >
> http://technet2.microsoft.com/Window...5-7247-4759-8d
> > > 6e-e400f77424651033.mspx
> > >
> > > Doug Sherman
> > > MCSE, MCSA, MCP+I, MVP
> > >
> > > "Joris van der Struijk" <(E-Mail Removed)>
> wrote
> > > in message news:A2E849C1-5173-475C-800C-(E-Mail Removed)...
> > > > Ok, i'v fixed that problem by configuring a right scope.
> > > >
> > > > Next major problem that's bothering me the whole day.
> > > >
> > > > The DHCP server has to be placed behind a Windows 2003 server with
> router
> > > > functionality. This server will be promoted to an ISA server later in
> the
> > > > project. First we have to setup the connection properly.
> > > >
> > > > I'v setup a 3600 router with the approperiate "ip helper-address
> > > > xx.xx.xx.xx" command to forward DHCP request trough the router. This
> > > works.
> > > >
> > > > The DHCP server that's going to serve the IP-addresses is placed
> behind a
> > > > Windows 2003 server with DHCP-relay installed.
> > > > Interface 1 of the Windows 2003 Router is connected to the Cisco
> router,
> > > > interface 2 is connected to the subnet where the DHCP server resides.
> This
> > > > Windows 2003 router has to forward the already forwarded DHCP request
> (by
> > > the
> > > > ciscro router) to the correct DHCP server.
> > > >
> > > > That's the problem, i don't know how to let Windows 2003 correctly
> forward
> > > > the Cisco router's DHCP request.
> > > >
> > > > HELP
> > > >
> > > > "Joris van der Struijk" schreef:
> > > >
> > > > > Were having problems creating the following scenario.
> > > > >
> > > > > Windows Server 2003:
> > > > > Int1: 10.6.0.1
> > > > > 255.255.224.0
> > > > > Int2: 10.6.128.2
> > > > > 225.225.224.0
> > > > >
> > > > > Server is acting as router with RRAS installed.
> > > > > DHCP relay is configured to listen in Int2
> > > > > DHCP relay is configured to send request to DHCP server with IP:
> > > 10.6.0.2
> > > > > wich is in network connected to Int1
> > > > >
> > > > > What i want is for clients connected to the subnet on Int2 to
> recieve a
> > > IP
> > > > > from DHCP server in subnet connected to Int1. For this i installed
> DHCP
> > > relay
> > > > > on the server.
> > > > > Is this at all possible??
> > > > > I notice that requests never make it to the DHCP server connected to
> the
> > > > > subnet on Int1.
> > > > >
> > > > > Any help is realy appreciated.
> > >
> > >
> > >
>
>
>