Cisco 1811 Config issues

Chris Barron · ‎02-27-2015

For some reason I can not get the config correct on my 1811.

I have been banging my head against this for a week now.

I have a dhcp server at the ip listed as the helper address but for some reason I cant get a dhcp address on FE1 and cant get dhcp assigments on FE0 with any device I have plugged in.

What am I missing? Probably something so obvious its not funny, but I could use some help.

Thanks in advance

Below is my conf

Building configuration...

Current configuration : 1483 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname router1.*********************
!
boot-start-marker
boot-end-marker
!
no logging console
enable secret 5 *******************************
enable password **********
!
no aaa new-model
!
!
dot11 syslog
no ip routing
!
!
no ip cef
!
!
!
multilink bundle-name authenticated
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
interface FastEthernet0
description LAN Interface
ip address 10.10.2.42 255.255.0.0
ip helper-address 10.10.2.99
ip nat inside
ip virtual-reassembly
no ip route-cache
duplex auto
speed auto
!
interface FastEthernet1
ip address dhcp
ip nat outside
ip virtual-reassembly
no ip route-cache
duplex auto
speed auto
!
interface FastEthernet2
shutdown
!
interface FastEthernet3
shutdown
!
interface FastEthernet4
shutdown
!
interface FastEthernet5
shutdown
!
interface FastEthernet6
shutdown
!
interface FastEthernet7
shutdown
!
interface FastEthernet8
shutdown
!
interface FastEthernet9
shutdown
!
interface Vlan1
no ip address
no ip route-cache
!
interface Async1
no ip address
encapsulation slip
no ip route-cache
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
ip nat inside source list 1 interface FastEthernet1 overload
!
access-list 1 permit any
snmp-server community public RO
!
!
!
!
!
!
control-plane
!
!
line con 0
line 1
line aux 0
line vty 0 4
password *****************
login
!
end

router1.*****************#

Henrik Grankvist · ‎02-27-2015

On what interface is the DHCP server located? Because if it is is located on the F0 interface, you don't even need the "ip-helper" command. If your hosts and the server is located on the same LAN segment, they should find each other and the sever should be able to allocate an IP adress to the host.

The problem that F1 is not allocated an IP adress is harder to know.

Chris Barron · ‎02-27-2015

The other part of this issue is that when I do get an ip on FE1 when its hooked to the modem

I can not get to the web from anything on FE0.

Any Ideas?

chris.kruslicky · ‎02-28-2015

Your question reads as if you're trying to assign the address for FE1 via the DHCP server connected to FE0, that won't work for a couple reasons. The router will send its DHCP request for FE1 out the FE1 interface, and the router won't assign the same subnet on two different routed interfaces.

Yet you said FE1 does get an IP from the modem's DHCP server as exected, and you have that as the nat outside interface... so I'm not entirely sure what the symtomps are sorry.

Chris Barron · ‎03-01-2015

Sorry for the confusion, what is happening is that when I get an IP from the modem I can not reach the "outside". In other words, FE1 and FE0 are not "talking" to each other.

Hope this helps a little bit.

Amit Shah · ‎03-02-2015

Hi,

Please try by addig ip default route. i.e. ip route command.

pankajbhosale · ‎07-15-2017

Try this

no access-list 1 permit any

access-list 1 permit ip 10.10.0.0 0.0.255.255 any

Bye