Question

Cisco Router and DHCP

Asked by: Tech3463

Hi,

I have started a home lab and have a Cisco 806 router with IOS 12.2 IP F/W Plus installed on it. I am trying to set up the 806 to be my gateway between my home network and my cable modem. I have set up nat and have that working properly, and I have tried RIP v2 running between the 806 and Linksys, which works ok, my problem is that I can't pull a DHCP IP address from my ISP from my e1 int to save my life, I can get an ip on my linksys off the cable modem and direct into my PC just fine but when I try it on my 806 no matter what I try it just wont take an IP off my cable modem, I know it has to be something in my config, because my modem works fine everywhere else, if you guys could take a look at my config and help me out I would appreciate it - THANKS!!!

806#sh ru
Building configuration...

Current configuration : 1726 bytes
!
version 12.2
no parser cache
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname 806
!
logging console informational
!

clock timezone PST -8
clock summer-time PDT recurring
ip subnet-zero
no ip source-route
no ip domain lookup
ip name-server x.x.x.x
ip name-server x.x.x.x
ip dhcp excluded-address 10.10.10.1
ip dhcp excluded-address 10.10.10.2
ip dhcp ping packets 1
ip dhcp ping timeout 100
!
ip dhcp pool CLIENT
import all
network 10.10.10.0 255.255.255.0
default-router 10.10.10.1
!
ip dhcp pool client
!
no ip bootp server
ip cef
!
!
!
interface Ethernet0
ip address 10.10.10.3 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting access-violations
ip nat inside
no cdp enable
hold-queue 32 in
hold-queue 100 out
!
interface Ethernet1
description "Internet"
ip address dhcp
ip verify unicast reverse-path
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting access-violations
ip nat outside
no cdp enable
!
ip nat log translations syslog
ip nat inside source list 1 interface Ethernet0 overload
no ip classless
ip route 0.0.0.0 0.0.0.0 192.168.1.1
no ip http server
!
!
access-list 1 permit any
access-list 102 permit ip 10.10.10.0 0.0.0.255 any
dialer-list 1 protocol ip permit
dialer-list 1 protocol ipx permit
no cdp run
!
line con 0
exec-timeout 120 0
logging synchronous
stopbits 1
line vty 0 4
exec-timeout 0 0
exec prompt timestamp
length 0
!
scheduler max-task-time 5000
scheduler interval 500
end

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Asked On
2003-06-30 at 18:34:07ID20664841
Tags

dhcp

,

cisco

,

router

Topic

Broadband Internet

Participating Experts
4
Points
250
Comments
10

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Answers

 

by: lrmoorePosted on 2003-06-30 at 18:43:54ID: 8831673

> ip verify unicast reverse-path
Have you tried it without this line?

Also, reboot the modem after disconnecting the Linksys.
Disconnect Linksys
Connect Cisco Router
Reboot modem
Reboot Cisco


 

by: Tech3463Posted on 2003-06-30 at 18:56:46ID: 8831712

that added the linksys directly connected network 192.168.1.0 network in my "show ip route" but I still cant get a dhcp address??

 

by: Tech3463Posted on 2003-06-30 at 19:35:59ID: 8831863

I was able to get an IP on my 806 off my linksys, thru DHCP after I removed the "ip verify unicast reverse-path" command , but still unable to get one from my ISP thru my cable modem, even though I can get one on my linksys and direct to my PC off the same modem, kinda weird, maybe Cisco uses a different port # for DHCP requests and my ISP may not recognize it or be blocking it, thanks for the help though Irmoore

 

by: lrmoorePosted on 2003-07-01 at 08:35:11ID: 8834478

The could have a mac address filter at the ISP. I have cable and I have to use the MAC addres clone tab on my Linksys to mimic my PC's MAC address...

 

by: llyquidPosted on 2003-07-02 at 04:02:40ID: 8838846

You need to call the cable company and tell them you are changing to a new PC and need to have the MAC address cleared from the cable modem.  To prevent people from sharing their cable modems amongst multiple computers,  the cable modem remeber the MAC address of the first system (be it PC or broadband router) and will not communicated with other devices.  

 

by: chooserPosted on 2003-07-03 at 12:09:47ID: 8852042

You should be able to just shutdown the cable modem for about 5 minutes to release the mac address from the cable provider.   This is the case 90% of the time.  On the second part of your request see if this will help:

int e1
mac-address XXXX.XXXX.XXXX
ip addr dhcp client-id XXXX.XXXX.XXXX hostname COMPUTERNAME

 

by: zoranssPosted on 2003-07-18 at 08:08:20ID: 8952488

could you pls run:

sh ip int brief on cisco machine

 

by: Tech3463Posted on 2003-07-19 at 11:36:18ID: 8959231

I fixed the Problem on my own, thanks for the input

 

by: lrmoorePosted on 2003-07-19 at 12:11:19ID: 8959349

Can you elighten us as to the solution? Perhaps we can keep this question in the database of solutions for others. You can get a refund of your points if you do...

 

by: chooserPosted on 2003-07-21 at 11:41:27ID: 8969791

20120131-EE-VQP-002

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