From: Tony Schaffran (groupstudy@cconlinelabs.com)
Date: Fri Jan 12 2007 - 21:07:04 ART
It will work with the client in the same vlan because the DHCP packet does
not get modified as when it passes through a DHCP relay.
When the DHCP relay passes a DHCP packet, it includes the gateway address
and subnet of the origination subnet so the DHCP server can assign the IP
address from the appropriate DHCP pool.
Tony Schaffran
Network Analyst
CCIE #11071
CCNP, CCNA, CCDA,
NNCDS, NNCSS, CNE, MCSE
www.cconlinelabs.com
Your #1 choice for online Cisco rack rentals.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Jian
Gu
Sent: Friday, January 12, 2007 3:51 PM
To: Tony Schaffran
Cc: ccie anees; Edison Ortiz; ccielab@groupstudy.com
Subject: Re: IOS DHCP issue
That certainly is not a correct configuration, but it does not explain why
debug on R1 did not show anything and why put DHCP server in the same vlan
of client will work -- assuming no other configuration change.
On 1/12/07, Tony Schaffran <groupstudy@cconlinelabs.com> wrote:
>
> The problem appears to be that your DHCP pool is a different subnet that
> the
> requesting device.
>
> Your pool subnet needs to be the same as vlan 3
>
> Tony Schaffran
> Network Analyst
> CCIE #11071
> CCNP, CCNA, CCDA,
> NNCDS, NNCSS, CNE, MCSE
>
> www.cconlinelabs.com
> Your #1 choice for online Cisco rack rentals.
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie
> anees
> Sent: Friday, January 12, 2007 2:50 PM
> To: Edison Ortiz; ccielab@groupstudy.com
> Subject: Re: IOS DHCP issue
>
>
> I don't see any DHCP packets received in the debug.
>
> If I put the R1 also in the same vlan as vlan 3 and set the IP of R1
> fa0/0
> to the vlan 3 subnet IP, It is serving IP address to R3.
>
> I know it is difficult to troubleshoot to someone else's config on the
> e-mail.
>
> I just want to make the IOS DHCP server to server IP for remote subnets.
> If anyone have any working config, I will test it.
>
>
> Edison Ortiz <edisonmortiz@gmail.com> wrote:
> What does debug for DHCP on R1 looks like ?
>
>
> ----- Original Message -----
> From: "ccie anees"
> To:
> Sent: Friday, January 12, 2007 4:34 PM
> Subject: IOS DHCP issue
>
>
> > Hi,
> >
> > I have issues in getting IP from different subnet. Please kindly read
> > the below notes and let me know what I am doing wrong.
> >
> > R1 ------------------ SW1 -------------------------- R3
> > VLAN 17 VLAN 3
> >
> > R1 - DHCP server
> > SW1 - DHCP relay
> > R3 - DHCP client
> > **********************************************************************
> > Problem: R3 is not receiving IP address from DHCP server
> > **********************************************************************
> > Configuration:
> > ###############
> > R1
> > ####
> > interface FastEthernet0/0
> > ip address 129.1.17.1 255.255.255.0
> > !
> > no ip dhcp conflict logging
> > ip dhcp excluded-address 129.1.3.1 129.1.3.2
> > ip dhcp excluded-address 129.1.3.4 129.1.3.254
> > !
> > ip dhcp pool R3_Pool
> > network 129.1.3.0 255.255.255.0
> > default-router 129.1.3.7
> > !
> >
> > SW1
> > ######
> > interface Vlan17
> > ip address 129.1.17.7 255.255.255.0
> > interface Vlan3
> > ip address 129.1.3.7 255.255.255.128
> > ip helper-address 129.1.17.1
> >
> > R3
> > ###
> > interface FastEthernet3/0
> > ip address dhcp
> >
> >
>
****************************************************************************
>
> ***************
> > DEBUG on SW1
> > SW1#debug ip dhcp server packet
> > SW1#
> > 4w0d: DHCPD: setting giaddr to 129.1.3.7.
> > 4w0d: DHCPD: BOOTREQUEST from
> > 0063.6973.636f.2d30.3064.302e.6262.3766.2e35.3035
> > 342d.4661.332f.30 forwarded to 129.1.17.1.
> > 4w0d: DHCPD: setting giaddr to 129.1.3.7.
> > 4w0d: DHCPD: BOOTREQUEST from
> > 0063.6973.636f.2d30.3064.302e.6262.3766.2e35.3035
> > 342d.4661.332f.30 forwarded to 129.1.17.1.
> >
> >
>
****************************************************************************
>
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> >
> >
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This archive was generated by hypermail 2.1.4 : Thu Feb 08 2007 - 23:46:56 ART