Sorry, Cai...
I misses your original message... Here is the least you should have:
DHCP Scope on LAN3 server:
Range: 192.168.1.10 - 192.168.1.50
Mask: 255.255.255.0
Default Gateway: 192.168.1.1 (Assuming this is the ip address of the
router's interface in LAN 1)
On Router1:
Interface Ethernet 0 (Assuming this is LAN3 Router's interface)
ip helper-address 192.168.100.2 (assuming this is your DHCP server IP
address)
Very important: MAKE SURE YOU HAVE A ROUTE from Router1 to Router3, and a
route back from Router3 to Router1.
This should do it...I hope this helps you...
Parrish.
"Parrish B. Gamarra" <[EMAIL PROTECTED]> wrote in message
8hrb59$1r0$[EMAIL PROTECTED]">news:8hrb59$1r0$[EMAIL PROTECTED]...
> Can you show us your Lab setup including IP addresses and your DHCP scope
> config
>
> Parrish.
>
> "Cai, Land" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > On DHCP server, I configured the default gateway for this IP scope. I
can
> > see this active leased IP on DHCP manager. Because it is the remote
> > computer, I login the router on Lan1, but can't ping this address. Is
the
> > DHCP manager reflects the wrong information about this active leased IP?
> Is
> > enabling ip helper -address on router interface e0 of LAN1 useless? How
to
> > resolve this problem?
> >
> > Thanks in advance.
> > Cai, Land
> >
> > -----Original Message-----
> > From: Kevin S. Mahler [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, June 08, 2000 9:01 PM
> > To: Cai, Land; 'Cisco (E-mail)'
> > Subject: RE: ask for help on DHCP
> >
> > On the PC on Lan1 can you check to see that it got it's IP address and
> > default gateway?
> > Windows95/98 command: winipcfg
> > WindowsNT command: ipconfig /all
> >
> > What did you set as the default gateway for this scope of IP addresses?
> > If the IP address is assigned with the wrong default gateway you will
see
> > exactly the type of behavior you have described. I suspect this is what
> > is happening.
> >
> > The default gateway for the scope on Lan1 needs to be the router
interface
> > on Lan1.
> >
> > If Lan1 is remote and you cannot check the computer, log into the router
> on
> > Lan1 and see if it can ping the address. If it can then it's about a
99%
> > chance
> > the default gateway of the machine is set incorrectly.
> >
> > An incorrect default gateway address accounts for about 75% of the ES
> > connectivity problems I run into.
> >
> > Kevin
> >
> >
> >
> > At 05:44 AM 6/8/00 -0500, Cai, Land wrote:
> >
> > >Yes, I only enable ip helper-address command on the Ethernet port on
> > >router1. But there is a quite strange problem. From DHCP manager( this
is
> > on
> > >NT4.0 ) I can see this active IP registration leased by one of the
remote
> > >client on LAN1, But on LAN3, I can't ping this active IP. I can ping
IP
> > >address of Ethernet port of router1. As well, I defined many options
for
> > >this IP scope on DHCP manager, such as domain name, DNS server, WIN
> server,
> > >note type.
> > >Do you have any idea about this?
> > >
> > >Landcai
> > > -----Original Message-----
> > >From: Gary Frye [mailto:]
> > >Sent: Monday, June 05, 2000 9:43 AM
> > >To: Cai, Land; 'Cisco (E-mail)'
> > >Subject: Re: ask for help on DHCP
> > >
> > >Yep, all you need is to configure the Helper address (ip helper-address
> > >[address]) command on Router1, and as long as Router1 has route to LAN3
> > >(whether by static or routing protocol... and Router3 has route back
to
> > >LAN1).
> > >See, Router1 will take the DHCP broadcasts and convert them into
unicast
> > >packets and send them directed to LAN3. For the "address" argument in
> the
> > >command you can use the specific IP of the DHCP server or use the
> broadcast
> > >address for that network (192.168.100.255).
> > >garyf
> > >----- Original Message -----
> > >From: "Cai, Land" <[EMAIL PROTECTED]>
> > >To: "'Cisco (E-mail)'" <[EMAIL PROTECTED]>
> > >Sent: Sunday, June 04, 2000 8:52 PM
> > >Subject: ask for help on DHCP
> > >
> > >
> > > > Dear gang,
> > > >
> > > > I have the following situation.
> > > >
> > > > Ethernet LAN1----Router1-----------Router2----(TokenRing>
> > >LAN1)-----Router3---------Ethernet LAN3
> > > > |
> > > > |
> > > > |
> > > > |
> > > > |
> > > > |
> > > >
> > > >
> > > >
> > > >
> > > > Let 's say Ethernet LAN1 has the ip segment 192.168.1.*/24,
> > > > Ethernet LAN3 has the IP segment 192.168.100.*/24,
> > > > I want the clients on Ethernet LAN1 can get ip address from
> > > > DHCP server located in Ethernet LAN3 automatically. Can I get it to
> > > > reality? I do only need to configure the IP helper address for
> Ethernet
> > > > interface on the router1, don't I? Or I need to configure something
on
> > > > router1, 2, 3?
> > > >
> > > > Thanks in advance,
> > > > Cai, land
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > ___________________________________
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>
> --------------------------------------------------------------------------
> --
> > -------------------------------------------------
> > Kevin S. Mahler, CCNP, CCDA, CCSE
> > Systems Engineer, Cisco Systems
> > Atlanta, GA
> >
> > Author of CCNA Training Guide, New Riders, ISBN 0735700516
> > Tech Editor of CCDA Exam Certification Guide, Cisco Press, ISBN
0735700745
> > Revision Author of Internetworking Technologies Handbook Third Edition,
> > Cisco Press
> >
> > See my homepage at <http://www.kmahler.com>
>
> --------------------------------------------------------------------------
> --
> > -----------------------------------------------
> > -
> >
> > ___________________________________
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> > ---
>
>
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