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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>
>___________________________________
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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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