10-23-2006 07:07 AM
Hello,
I have on Cisco Soho 97 adsl router. I have set a dhcp server like this:
ip dhcp pool Test
network X.X.X.X Y.Y.Y.Y
default-router Z.Z.Z.Z
dns-server A.A.A.A B.B.B.B
domain-name test.com
lease 7
With this settings my PC doesn't get any address.
When I look dhcp statistics on the router there are nothing in DHCP_Discover like the are not communicating.
However, if I put static address in my PC I can ping the router.
I would be grateful for anay help.
P-S: DHCP service is running and I have IOS on 12.4 version.
10-23-2006 01:28 PM
"service dhcp"?
from:
By default, the Cisco IOS DHCP Server feature is enabled on your router. If the feature is disabled, use the following command in global configuration mode to reenable the Cisco IOS DHCP Server feature on your router:
10-23-2006 11:33 PM
As I wrote in my first message, the service DHCP is running.
Is there a known bug with DHCP and IOS 12.4 ?
10-24-2006 05:57 AM
Julien
While we can not dismiss the possibility of an IOS bug I am not aware of a general bug with DHCP in 12.4. I suspect that it is more likely to be an issue with your configuration. Your effort to disguise information gives us nothing useful to work with in diagnosing what the problem might be. If you can post some details of the configuration of the interface and the details of the DHCP configuration we might be able to identify the problem. If you feel the need to protect information then I suggest that you change the value of the first octet being sure to maintain the same class A, class B, or class C address space.
HTH
Rick
10-24-2006 06:23 AM
Thanks Rick for your help.
This my config, thanks by advance
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname MyHostname
!
boot-start-marker
boot system flash soho97-k9oy1-mz.124-10a.bin
boot-end-marker
!
enable secret 5 MySecret
enable password 7 MyPassword
!
no aaa new-model
no ip routing
no ip dhcp use vrf connected
ip dhcp excluded-address 172.18.15.200 172.18.15.254
!
ip dhcp pool Client
network 172.18.15.0 255.255.255.0
default-router 172.18.15.254
dns-server 172.18.4.11 172.18.4.12
domain-name Mydomain.com
lease 42
!
!
no ip cef
!
!
!
!
!
!
!
!
interface Ethernet0
ip address 10.2.15.254 255.255.255.0 secondary
ip address 172.18.15.253 255.255.255.0
no ip route-cache
no ip mroute-cache
bridge-group 1
hold-queue 100 out
!
interface ATM0
no ip address
no ip route-cache
no ip mroute-cache
no shutdown
no atm ilmi-keepalive
dsl operating-mode auto
bridge-group 1
pvc 8/35
pppoe-client dial-pool-number 1
!
!
no ip http server
no ip http secure-server
!
!
dialer-list 1 protocol ip permit
!
control-plane
!
bridge 1 protocol dec
!
line con 0
no modem enable
stopbits 1
line aux 0
stopbits 1
line vty 0 4
password 7 MyVirtualPAssword
login
!
scheduler max-task-time 5000
end
10-24-2006 08:56 AM
Julien
Thanks for posting the additional information. I have looked at the config that you posted and have these comments:
- the DHCP config looks reasonable and I do not see any particular problem with it.
- I am not sure why the DHCP specifies the default-router 172.18.15.254. The interface address is 172.18.15.253 so is the default router something that is connected?
- I am surprised that you have turned off IP routing and have turned on bridging. I suspect that turning off IP routing may be the cause of the failure of the DHCP. Is it possible to turn on IP routing and see if the DHCP works then?
HTH
Rick
10-24-2006 02:02 PM
Thanks Rick,
In fact the default router is not my cisco router but a firewall. And the adsl connection is made by the firewall with the bridge interface of the router.
This config works fine on another site, that's the reason why I don't understand why my DHCP doesn't work.
If I look the statistics 0 is present everywhere.
I will try enable routing to see if it is the solution. I will try tomorrow.
10-27-2006 05:28 AM
Hi Ricks,
After testing, it seems that it's that the problem come with the bridge configuration. DHCP and bridge configuration are not possible ?
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