DHCP not working for Rogers (CA) 1

[SeSe]

Hi,
I'm trying to set up a 2503 as a DHCP client for Rogers (Canada). But for some reasons it does not work. This is the config:

ids_2500_router_2#sho conf
Using 1309 out of 32762 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
service udp-small-servers
!
hostname ids_2500_router_2
!
enable secret bla, bla, bla
enable password 7 bla, bla, bla
!
username XXX password 7 YYYYY

!
!
!
!
ip subnet-zero
!
isdn switch-type ntt
!
!
!
!
!
interface Ethernet0
ip address dhcp
ip nat outside
no ip route-cache
no ip mroute-cache
no cdp enable
!
interface Serial0
ip address 10.2.3.2 255.255.255.252
ip nat inside
no ip route-cache
no ip mroute-cache
down-when-looped
clockrate 2000000
!
interface Serial1
no ip address
no ip route-cache
no ip mroute-cache
shutdown
!
interface BRI0
no ip address
encapsulation ppp
no ip route-cache
no ip mroute-cache
shutdown
dialer idle-timeout 60
dialer string 08912184575
dialer-group 1
isdn switch-type ntt
!
router eigrp 1
network 10.0.0.0
!
ip nat inside source list 100 interface Ethernet0 overload
no ip classless
no ip http server
!
access-list 99 permit 192.168.2.70
access-list 100 permit ip any any log
dialer-list 1 protocol ip permit
!
line con 0
exec-timeout 10 10
transport input none
line aux 0
line vty 0 4
password 7 15060E000A2F3F643B362627
login local
!
end


This is the output of debug:
3d09h: DHCP: DHCP client process started: 10
3d09h: DHCP: allocate request
3d09h: DHCP: new entry. add to queue
3d09h: DHCP: SDiscover attempt # 1 for entry:
3d09h: Temp IP addr: 0.0.0.0 for peer on Interface: Ethernet0
3d09h: Temp sub net mask: 0.0.0.0
3d09h: DHCP Lease server: 0.0.0.0, state: 1 Selecting
3d09h: DHCP transaction id: 549
3d09h: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
3d09h: Next timer fires after: 00:00:02
3d09h: Retry count: 1 Client-ID: cisco-0000.0c3e.72c6-Et0
3d09h: DHCP: SDiscover: sending 297 byte length DHCP packet
3d09h: DHCP: SDiscover 297 bytes
3d09h: B'cast on Ethernet0 interface from 0.0.0.0
3d09h: %LINK-3-UPDOWN: Interface Ethernet0, changed state to up
3d09h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to up
3d09h: DHCP: SDiscover attempt # 2 for entry:
3d09h: Temp IP addr: 0.0.0.0 for peer on Interface: Ethernet0
3d09h: Temp sub net mask: 0.0.0.0
3d09h: DHCP Lease server: 0.0.0.0, state: 1 Selecting
3d09h: DHCP transaction id: 549
3d09h: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
3d09h: Next timer fires after: 00:00:02
3d09h: Retry count: 2 Client-ID: cisco-0000.0c3e.72c6-Et0
3d09h: DHCP: SDiscover: sending 297 byte length DHCP packet
3d09h: DHCP: SDiscover 297 bytes
3d09h: B'cast on Ethernet0 interface from 0.0.0.0
3d09h: DHCP: SDiscover attempt # 3 for entry:
3d09h: Temp IP addr: 0.0.0.0 for peer on Interface: Ethernet0
3d09h: Temp sub net mask: 0.0.0.0
3d09h: DHCP Lease server: 0.0.0.0, state: 1 Selecting
3d09h: DHCP transaction id: 549
3d09h: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
3d09h: Next timer fires after: 00:00:02
3d09h: Retry count: 3 Client-ID: cisco-0000.0c3e.72c6-Et0
3d09h: DHCP: SDiscover: sending 297 byte length DHCP packet
3d09h: DHCP: SDiscover 297 bytes
3d09h: B'cast on Ethernet0 interface from 0.0.0.0
3d09h: DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible
3d09h: DHCP: allocate request
3d09h: DHCP: zapping entry in DHC_PURGING state for Et0
3d09h: DHCP: new entry. add to queue
3d09h: DHCP: SDiscover attempt # 1 for entry:
3d09h: Temp IP addr: 0.0.0.0 for peer on Interface: Ethernet0
3d09h: Temp sub net mask: 0.0.0.0
3d09h: DHCP Lease server: 0.0.0.0, state: 1 Selecting
3d09h: DHCP transaction id: 54A
3d09h: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
3d09h: Next timer fires after: 00:00:02
3d09h: Retry count: 1 Client-ID: cisco-0000.0c3e.72c6-Et0
3d09h: DHCP: SDiscover: sending 297 byte length DHCP packet
3d09h: DHCP: SDiscover 297 bytes
3d09h: B'cast on Ethernet0 interface from 0.0.0.0
3d09h: DHCP: SDiscover attempt # 2 for entry:
3d09h: Temp IP addr: 0.0.0.0 for peer on Interface: Ethernet0
3d09h: Temp sub net mask: 0.0.0.0
3d09h: DHCP Lease server: 0.0.0.0, state: 1 Selecting
3d09h: DHCP transaction id: 54A
3d09h: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
3d09h: Next timer fires after: 00:00:02
3d09h: Retry count: 2 Client-ID: cisco-0000.0c3e.72c6-Et0
3d09h: DHCP: SDiscover: sending 297 byte length DHCP packet
3d09h: DHCP: SDiscover 297 bytes
3d09h: B'cast on Ethernet0 interface from 0.0.0.0
3d09h: DHCP: SDiscover attempt # 3 for entry:
3d09h: Temp IP addr: 0.0.0.0 for peer on Interface: Ethernet0
3d09h: Temp sub net mask: 0.0.0.0
3d09h: DHCP Lease server: 0.0.0.0, state: 1 Selecting
3d09h: DHCP transaction id: 54A
3d09h: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
3d09h: Next timer fires after: 00:00:02
3d09h: Retry count: 3 Client-ID: cisco-0000.0c3e.72c6-Et0
3d09h: DHCP: SDiscover: sending 297 byte length DHCP packet
3d09h: DHCP: SDiscover 297 bytes
3d09h: B'cast on Ethernet0 interface from 0.0.0.0
3d09h: DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible
3d09h: %SEC-6-IPACCESSLOGP: list 100 permitted udp 0.0.0.0(0) -> 255.255.255.255(0), 6 pa

a.s.o
Any ideeas?
Thanks,
SS

 

[gbiello]

I see Discover packets going out, but no Offer packets coming back. Can you give the interface a temporary static and see if you can ping the DHCP server? Does DHCP work in general on this subnet?

-gbiello

 

[SeSe]

Hi,
Thanks for your reply. If I replace the router with a 3COM home-router set as a DHCP client everything works fine. Only the router does not seem to recognise the DHCP server. I will try to find out it's address although Rogers is not very cooperative in this respect.
If you can think of what else should I do, I would really appreciate it.
SS

 

[rburke]

You might want to try cloning the mac address of hte original computer for the outside ethernet (DHCP client) interface. Alot of cable services are going to this as a precaution of people using more than one computer and not paying for it. Even if they haven't stored your Mac address, then they can still filter Macs of known networking companies (namely Cisco, because they don't make NICS, but do make routers, switches, hubs, etc, and cable companies think you should pay them for every computer on the network....). That is just an idea seeing that you aren't getting any kind of response from the DHCP server, ut when you put in the 3Com(different manufacturer MAC) then it connects just fine.
When you got the 3Com did you do any kind of setup for your cable service?

If you want to change the mac use these commands:
>enable
Password:
#config t
(conf)# int e0
(config-intf)# mac-address xxxx.xxxx.xxxx
(config-intf)# (Press Crtl-Z)
#write mem
(prints some stuff to screen)
#

and you're done.

Hope this helps....

Burke

 

[SeSe]

It works now!!! Yes, after setting up the same MAC as the 3COM box and fooling the cliend ID string as well it works excelent. Thanks rburke!!!