From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Mon Oct 15 2007 - 06:51:44 ART
Does R3 have reachability to the network of R4 serial interface?
Try adding a static route on R3 for 132.20.54.x pointing out to R5's IP
address adjacent to R3.
On 10/15/07, shiran guez <shiranp3@gmail.com> wrote:
>
> Hi
>
> this is a task taken from IEWB
>
> R4
> |
> \
> /
> |
> R5
>
> R4 connected via Serial link to R5
>
>
> R4#sh run int ser1/1
> Building configuration...
>
> Current configuration : 121 bytes
> !
> interface Serial1/1
> ip address negotiated
> encapsulation ppp
> no peer default ip address
> serial restart-delay 0
> end
>
> R5#
>
> ip dhcp-server 132.20.53.3
> !
> interface Serial1/1
> ip address 132.20.54.5 255.255.255.0
> encapsulation ppp
> peer default ip address dhcp
> serial restart-delay 0
> end
>
> R5#ping 132.20.53.3
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 132.20.53.3, timeout is 2 seconds:
> !!!!!
>
> R3 is the DHCP Server as you can see the above ping there is no
> reachablilty
> problem
>
> ip dhcp excluded-address 132.20.54.1 132.20.54.3
> ip dhcp excluded-address 132.20.54.5 132.20.54.254
> !
> ip dhcp pool R4
> network 132.20.54.0 255.255.255.0
>
> R3#
> *Mar 1 12:24:31.108: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> *Mar 1 12:24:31.112: DHCPD: Allocate an address without class information
> (
> 132.20.54.0)
> R3#
> *Mar 1 12:24:33.116: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:33.120: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> *Mar 1 12:24:33.656: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> *Mar 1 12:24:33.660: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:33.664: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> R3#
> *Mar 1 12:24:34.540: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> *Mar 1 12:24:34.540: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:34.540: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> R3#
> *Mar 1 12:24:37.700: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> *Mar 1 12:24:37.700: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:37.700: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> *Mar 1 12:24:38.624: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> R3#
> *Mar 1 12:24:38.628: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:38.632: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> R3#
> *Mar 1 12:24:41.672: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> *Mar 1 12:24:41.676: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:41.680: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> R3#
> *Mar 1 12:24:42.740: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> *Mar 1 12:24:42.744: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:42.748: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> R3#
> *Mar 1 12:24:46.660: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> *Mar 1 12:24:46.664: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:46.668: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> *Mar 1 12:24:46.876: DHCPD: DHCPDISCOVER received from client
>
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31through
> relay
> 132.20.54.5.
> R3#
> *Mar 1 12:24:46.880: DHCPD: Sending DHCPOFFER to client
> 0063.6973.636f.2d31.3332.2e32.302e.3534.2e35.2d53.6572.6961.6c31.2f31 (
> 132.20.54.4).
> *Mar 1 12:24:46.884: DHCPD: unicasting BOOTREPLY for client
> cc04.11a1.0000to relay
> 132.20.54.5.
> R3#un all
>
> R4 as you can see is not reciving that address:
>
>
>
> *Mar 1 12:34:24.264: Se1/1 IPCP: Timeout: State ACKsent
> *Mar 1 12:34:24.268: Se1/1 IPCP: O CONFREQ [ACKsent] id 9 len 10
> *Mar 1 12:34:24.268: Se1/1 IPCP: *Address 0.0.0.0* (0x030600000000)
> *Mar 1 12:34:24.344: Se1/1 IPCP: I CONFREQ [ACKsent] id 9 len 10
> *Mar 1 12:34:24.348: Se1/1 IPCP: Address 132.20.54.5 (0x030684143605)
> *Mar 1 12:34:24.352: Se1/1 IPCP: O CONFACK [ACKsent] id 9 len 10
> *Mar 1 12:34:24.352: Se1/1 IPCP: Address 132.20.54.5 (0x030684143605)
> *Mar 1 12:34:24.648: Se1/1 IPCP: I CONFREJ [ACKsent] id 7 len 10
> *Mar 1 12:34:24.652: Se1/1 IPCP: *Address 0.0.0.0* (0x030600000000)
> *Mar 1 12:34:24.652: Se1/1 IPCP: ID 7 didn't match 9, discarding packet
> R4(config)#
> *Mar 1 12:34:26.252: Se1/1 IPCP: I CONFREQ [ACKsent] id 10 len 10
> *Mar 1 12:34:26.252: Se1/1 IPCP: Address 132.20.54.5 (0x030684143605)
> *Mar 1 12:34:26.256: Se1/1 IPCP: O CONFACK [ACKsent] id 10 len 10
> *Mar 1 12:34:26.260: Se1/1 IPCP: Address 132.20.54.5 (0x030684143605)
> *Mar 1 12:34:26.280: Se1/1 IPCP: Timeout: State ACKsent
> *Mar 1 12:34:26.284: Se1/1 IPCP: O CONFREQ [ACKsent] id 10 len 10
> *Mar 1 12:34:26.284: Se1/1 IPCP: *Address 0.0.0.0* (0x030600000000)
> R4(config)#
> *Mar 1 12:34:28.296: Se1/1 IPCP: Timeout: State ACKsent
> *Mar 1 12:34:28.300: Se1/1 IPCP: State is ACKsent
> *Mar 1 12:34:28.784: Se1/1 IPCP: I CONFREJ [ACKsent] id 9 len 10
> *Mar 1 12:34:28.788: Se1/1 IPCP: *Address 0.0.0.0* (0x030600000000)
> *Mar 1 12:34:28.788: Se1/1 IPCP: ID 9 didn't match 10, discarding packe
> R3 allocated the correct address:
>
> R3#sh ip dhcp binding
> Bindings from all pools not associated with VRF:
> IP address Client-ID/ Lease expiration Type
> Hardware address/
> User name
> 132.20.54.4 0063.6973.636f.2d31. Mar 01 2002 12:31 PM
> Automatic
> 3332.2e32.302e.3534.
> 2e35.2d53.6572.6961.
> 6c31.2f31
>
> --
> Shiran Guez
> MCSE CCNP NCE1
> http://cciep3.blogspot.com
> http://www.linkedin.com/in/cciep3
>
> _______________________________________________________________________
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