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Beginner

Networking

 

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
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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
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VIP Expert

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

 



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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.

Highlighted

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.



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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

 

 

Highlighted

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



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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. 

Highlighted

sure as i mentioned the mobile has some correction

 

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



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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
!
!

 

Highlighted

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
!
!



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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

Highlighted

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

 

 



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

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Rising star

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

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