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Networking

Sanjay916
Level 1
Level 1
 

Hello, I am trying to solve this network. It is a bit challenging. I am trying to configure static routing, dhcp, and ip helper address. My dhcp is not sending any address to my pc. My static routing is not working. I am not sure what I doing wrong please help. I include a screenshot of the network diagram and  a screenshot of my config script. 

 

 

1 Accepted Solution

Accepted Solutions

make sure your paste command correct device, you pasting commands of Router2 on Router 1 -  read the post correctly

 

 

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13 Replies 13

balaji.bandi
Hall of Fame
Hall of Fame

A Router connected to network with hosts should use the last available IP in the subnet

 

High level it should work - check before adding, there may be some typos - add IP helper config to work on the interface towards DHCP

 

Router 0
g0/0:195.165.85.1 255.255.255.252
g0/1:195.165.85.62 255.255.255.224

ip route 0.0.0.0 0.0.0.0 192.165.85.2

Router 1
g0/0:195.165.85.2 255.255.255.252
g0/1:195.165.85.6 255.255.255.252
g0/2:195.165.85.94 255.255.255.224

ip route 195.165.85.32 255.255.255.224 192.165.85.1
ip route 195.165.85.96 255.255.255.224 192.165.85.5


Router 2
g0/0:195.165.85.5 255.255.255.252
g0/1:195.165.85.126 255.255.255.224

ip route 0.0.0.0 0.0.0.0 192.165.85.6

 

ip dhcp pool net32
network 195.165.85.32 255.255.255.224
default-router 195.165.85.62

ip dhcp pool net64
network 195.165.85.64 255.255.255.224
default-router 195.165.85.94

ip dhcp pool net96
network 195.165.85.96 255.255.255.224
default-router 195.165.85.126


ip dhcp excluded-address 195.165.85.62
ip dhcp excluded-address 195.165.85.94
ip dhcp excluded-address 195.165.85.126

 

BB

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Thank you for replying. PC0 is getting an ip address from the dhcp. But i notice that PC1 and PC2 is not getting any ip address. I used the ip helper on router 1 and router 2 but it is still not getting the ip address. This is the command i used 

ip helper-address 195.165.85.62.

PC0 getting IP address - in the same range ?

 

ip dhcp pool net32
network 195.165.85.32 255.255.255.224
default-router 195.165.85.62

 

Can you post Router0 / Router 1 / router 2 config   - just to clarify some information before i can advise.

BB

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Yes, PC0 is getting an address 195.165.85.33.

 

This is the configuration for router 0,1and 2

 

Router 0
g0/0:195.165.85.1 255.255.255.252
g0/1:195.165.85.62 255.255.255.224

ip route 0.0.0.0 0.0.0.0 192.165.85.2

Router 1
g0/0:195.165.85.2 255.255.255.252
g0/1:195.165.85.6 255.255.255.252
g0/2:195.165.85.94 255.255.255.224

ip route 195.165.85.32 255.255.255.224 192.165.85.1
ip route 195.165.85.96 255.255.255.224 192.165.85.5


Router 2
g0/0:195.165.85.5 255.255.255.252
g0/1:195.165.85.126 255.255.255.224

ip route 0.0.0.0 0.0.0.0 192.165.85.6

 

ip dhcp pool net32
network 195.165.85.32 255.255.255.224
default-router 195.165.85.62

ip dhcp pool net64
network 195.165.85.64 255.255.255.224
default-router 195.165.85.94

ip dhcp pool net96
network 195.165.85.96 255.255.255.224
default-router 195.165.85.126


ip dhcp excluded-address 195.165.85.62
ip dhcp excluded-address 195.165.85.94
ip dhcp excluded-address 195.165.85.126

 

Router 1

int gig 0/2  ip helper-address 195.165.85.62

 

Router 2

int gig 0/1  ip helper-address 195.165.85.62

 

 

I have not seen a helper address that has not provided Router 0 helper config- try below.

 

remove old helper-address and try below on below routers and let us know. (typing from mobile may be some typo)

 

Router 1

int gig 0/2 ip helper-address 195.165.85.94

 

Router 2

int gig 0/1 ip helper-address 192.165.85.6

BB

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I remove the helper addresses and reconfigure it with the ones that you provided but it didn't work. Also, in your last reply  i notice that you made a typo for Router 2 you be put .6 but i believe it suppose to be .126

 

I also notice that router0 cant ping router 2. I am wondering if their is an issues somewhere along their. 

sure as i mentioned the mobile has some correction

 

get in to device - show run and post full config. on all routers

BB

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Ok. Thank you. Here the configurations of router 0, 1, and 2. 

 

Router0

ip dhcp excluded-address 195.165.85.62
ip dhcp excluded-address 195.165.85.94
ip dhcp excluded-address 195.165.85.126
!
ip dhcp pool net32
network 195.165.85.32 255.255.255.224
default-router 195.165.85.62
ip dhcp pool net64
network 195.165.85.64 255.255.255.224
default-router 195.165.85.94
ip dhcp pool net96
network 195.165.85.96 255.255.255.224
default-router 195.165.85.126

interface GigabitEthernet0/0
ip address 195.165.85.1 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 195.165.85.62 255.255.255.224
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.165.85.2
!
ip flow-export version 9

 

 


Router 1

interface GigabitEthernet0/0
ip address 195.165.85.2 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 195.165.85.6 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/2
ip address 195.165.85.94 255.255.255.224
ip helper-address 195.165.85.94
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 195.165.85.32 255.255.255.224 192.165.85.1
ip route 195.165.85.96 255.255.255.224 192.165.85.5
!
ip flow-export version 9

 

 


Router2

interface GigabitEthernet0/0
ip address 195.165.85.5 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 195.165.85.126 255.255.255.224
ip helper-address 192.165.85.6
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.165.85.6
!
ip flow-export version 9
!
!
!
no cdp run
!
!

 

I was in impression router 1 acting as DHCP - But as per the config Router 0 acting as DHCP Server, so we need to change as below bold  - test and advise

 

Router0

ip dhcp excluded-address 195.165.85.62
ip dhcp excluded-address 195.165.85.94
ip dhcp excluded-address 195.165.85.126
!
ip dhcp pool net32
network 195.165.85.32 255.255.255.224
default-router 195.165.85.62
ip dhcp pool net64
network 195.165.85.64 255.255.255.224
default-router 195.165.85.94
ip dhcp pool net96
network 195.165.85.96 255.255.255.224
default-router 195.165.85.126

interface GigabitEthernet0/0
ip address 195.165.85.1 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 195.165.85.62 255.255.255.224
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
ip classless
no ip route 0.0.0.0 0.0.0.0 192.165.85.2
ip route 195.165.85.64 255.255.255.224 192.165.85.2
ip route 195.165.85.96 255.255.255.224 192.165.85.2
!
ip flow-export version 9

 

 


Router 1

interface GigabitEthernet0/0
ip address 195.165.85.2 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 195.165.85.6 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/2
ip address 195.165.85.94 255.255.255.224
ip helper-address 195.165.85.1
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 195.165.85.32 255.255.255.224 192.165.85.1
ip route 195.165.85.64 255.255.255.224 192.165.85.94
ip route 195.165.85.96 255.255.255.224 192.165.85.5
!
ip flow-export version 9

 

 


Router2

interface GigabitEthernet0/0
ip address 195.165.85.5 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 195.165.85.126 255.255.255.224
ip helper-address 192.165.85.1
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
ip classless
no ip route 0.0.0.0 0.0.0.0 192.165.85.6
ip route 195.165.85.32 255.255.255.224 192.165.85.6
ip route 195.165.85.64 255.255.255.224 192.165.85.6
ip route 195.165.85.96 255.255.255.224 192.165.85.126
!
ip flow-export version 9
!
!
!
no cdp run
!
!

BB

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How to Ask The Cisco Community for Help

When I try input to input the ip route into router 1. I keep getting invalid hop. 

 

 

Router(config)#no ip route 0.0.0.0 0.0.0.0 192.165.85.6

%No matching route to delete

Router(config)#ip route 195.165.85.32 255.255.255.224 195.165.85.6

%Invalid next hop address (it's this router)

Router(config)#ip route 195.165.85.64 255.255.255.224 195.165.85.6

%Invalid next hop address (it's this router)

Router(config)#ip route 195.165.85.96 255.255.255.224 195.165.85.126

make sure your paste command correct device, you pasting commands of Router2 on Router 1 -  read the post correctly

 

 

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Ok thank you very much for the help. It is working now.

return path from DHCP server to IP help interface.
check this point.

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