From: YourPal (dearprudence28@gmail.com)
Date: Fri Feb 29 2008 - 06:48:07 ARST
Hi Ivan,
In my setup, I run OSPF on the three routers. R1 has no static route to the
139.1.45.0/24 network. It is OSPF-learned.
With this configuration, R4 sometimes did successfully negotiate an IP
address, sometimes not. But if I configured the static route on R1 (like you
did), the result is much more predictable. R4 always can obtain an IP
address.
The way I tested it was, I shut and no shut int s0/1 on R4.
Thank you.
BR,
Emil
On 2/20/08, Caduff, Ivan (GD EMEA ITO Network) <Ivan.Caduff@hp.com> wrote:
>
> Hi Emil,
> I've just setup your environment and detected that R1 needs a route for
> your ppp network (139.1.45.0/24). R1 wants tos end back a unicast
> bootreply to your dhcp relay (139.1.45.5) as final acknowledge for the
> dhcp lease:
> *Jan 8 04:43:17.146: DHCPD: unicasting BOOTREPLY for client
> 0008.e39c.28d0 to relay 139.1.45.5.
> *Jan 8 04:43:17.146: IP: s=155.1.10.5 (local), d=139.1.45.5, len 328,
> unroutable
> This will fail as long as you add the route.
>
> R1:
> ip route 139.1.45.0 255.255.255.0 139.1.15.5
>
> Hope it helps
> Regards
> Ivan
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> YourPal
> Sent: Montag, 18. Februar 2008 01:52
> To: ccielab@groupstudy.com
> Subject: Issue with DHCP proxy-client feature
>
> Hi Group,
>
> I'm facing an issue with DHCP proxy-client feature. Below is my setup:
>
> R4 (s0/1) -----PPP----- (s0/1/0) R5 (s0/0/0.501 p2p) -----FR----- (s0/0/0)
> R1
>
>
> R5 is configured with DHCP proxy-client feature. R4 negotiates an IP
> address
> dynamically. R1 is the DHCP server and should supply R4's serial interface
> with the IP address 139.1.45.4.
>
> R4 config
> ---------
> !
> interface Serial0/1
> ip address negotiated
> encapsulation ppp
> !
>
> R5 config
> ---------
> !
> interface Serial0/1/0
> ip address 139.1.45.5 255.255.255.0
> encapsulation ppp
> peer default ip address dhcp
> clockrate 2000000
> !
> interface Serial0/0/0.501 point-to-point
> ip address 139.1.15.5 255.255.255.0
> frame-relay interface-dlci 501
> !
> ip dhcp-server 139.1.15.1
> !
>
> R1 config
> ---------
> !
> interface Serial0/0/0
> ip address 139.1.15.1 255.255.255.0
> encapsulation frame-relay
> frame-relay map ip 139.1.15.5 105 broadcast
> no frame-relay inverse-arp
> !
> ip dhcp excluded-address 139.1.45.1 139.1.45.3
> ip dhcp excluded-address 139.1.45.5 139.1.45.254
> ip dhcp pool TEMP_R4
> network 139.1.45.0 255.255.255.0
> !
>
>
> R4 fails to negotiate an IP address despite R1 having a DHCP binding:
>
> R1#sh ip dh binding
> Bindings from all pools not associated with VRF:
> IP address Client-ID/ Lease expiration Type
> Hardware address/
> User name
> 139.1.45.4 0063.6973.636f.2d31. Feb 18 2008 02:30 PM
> Automatic
> 3339.2e31.2e34.352e.
> 352d.5365.7269.616c.
> 302f.312f.30
>
>
> Shut R4's s0/1 interface, do "cle ip dhc bind *" on R1, then no shut R4's
> s0/1 interface. R4 still fails to obtain an IP address.
>
> Part of the outputs of "deb ppp nego" on R4:
>
> Se0/1 IPCP: I CONFREQ [ACKsent] id 10 len 10
> Se0/1 IPCP: Address 139.1.45.5 (0x03068B012D05)
> Se0/1 IPCP: O CONFACK [ACKsent] id 10 len 10
> Se0/1 IPCP: Address 139.1.45.5 (0x03068B012D05)
> Se0/1 IPCP: TIMEout: State ACKsent
> Se0/1 IPCP: O CONFREQ [ACKsent] id 10 len 10
> Se0/1 IPCP: Address 0.0.0.0 (0x030600000000)
> Se0/1 IPCP: I CONFREJ [ACKsent] id 8 len 10
> Se0/1 IPCP: Address 0.0.0.0 (0x030600000000)
> Se0/1 IPCP: ID 8 didn't match 10, discarding packet
>
>
> Can anyone advise what am I missing?
>
>
> Thank you.
>
> BR,
> Emil
>
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