RE: dhcp diagram
From: Grant (Grant_at_discussions.microsoft.com)
Date: 09/17/04
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Date: Fri, 17 Sep 2004 08:05:34 -0700
The DHCP Relay agent / bootp relay will insert something like:
Relay agent IP address: 192.168.x.x
into the DHCP frame.
"Jeigh" wrote:
> I'm using the courier new font in this diagram, so the ascii art might not
> look right unless you switch your font to a fixed width font.
>
> heres a diagram of what I am trying to illustrate:
>
>
>
> |--------------------------------
> | subnet b (192.168.2.x)
> |---------|
> | bootp |
> -------------------------| enabled |
> subnet a (192.168.1.x) | router |
> |---------|
> |
> |---------------------------------
> subnet c (192.168.3.x
>
>
>
> if a box on [subnet a] has dhcp server installed on it, how does it know not
> to assign 192.168.2.x IPs to the computers on [subnet c]?
>
>
>
>
>
> "Irwin Utama" <irwin_utama@yahoo.com> wrote in message
> news:uiR%23y$HnEHA.748@TK2MSFTNGP15.phx.gbl...
> > Hi Jeigh,
> >
> > DHCP uses broadcast to send its packet. So it is only limited to its own
> > subnet, that's why we need to set up dhcp relay agent on other subnet to
> > pass the packet to the DHCP server. DHCP relay agent will forward packet
> > from client to the DHCP server that listed on it. DHCP will assign IP
> > address to the client based on subnet of its dhcp relay agent.
> > If you use dhcp relay agent, you donot need to pass bootp packets on your
> > router.
> >
> > regards,
> > irwin
> >
> >
> >
> > "Jeigh" <folkens.jason@acd.net> wrote in message
> > news:ReCdnQy8yOW9_dfcRVn-rQ@giganews.com...
> >> I'm confused.
> >>
> >>
> >> Heres my situation...
> >>
> >> I have 1 DHCP Server with two scopes.
> >> The dhcp server is 192.168.1.2.
> >>
> >> The first scope handles 192.168.1.x
> >> The second scope handles 192.168.2.x
> >>
> >> The subnets are connected through a router that passes bootp through
> > it....
> >> In a seperate implementation, there may be a dhcp relay agent, but since
> >> there are no significant configuration options set when installing a dhcp
> >> relay agent, I don't think that changes the answer to this quesiton so
> > lets
> >> pretend that the router passes bootp traffic to the subnet with the DHCP
> >> server.
> >>
> >> How does the DHCP server determine which subnet a dhcp client is on,
> >> prior
> >> to the server giving the client its new IP. In a routed network, where
> >> there are multiple scopes, different dhcp options must be set up for each
> >> individual scope, and each scope is used to set options for all dhcp
> > clients
> >> on a given subnet... but how does DHCP know which subnet a specific
> > client
> >> is coming from unless it already has an IP address?
> >>
> >> I've read documentation stating that in a multihomed DHCP server setup,
> > the
> >> DHCP server actually needs to have a seperate nic to be associated with
> > each
> >> individual scope... but I cant believe that that is the case in this
> >> situation because if that were true, then DHCP Relay agent would have a
> > very
> >> limited purpose, and bootp would never be routed.
> >>
> >> any ideas?
> >>
> >> -- Jason
> >>
> >>
> >
> >
>
>
>
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- In reply to: Jeigh: "dhcp diagram"
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