Hi there , I am trying to create a network which will allow me to use PAT on the router although i am having difficulty to make it work. I have R3 being the main router to configure the nat translations. the server connected to R3 is able to ping just fine to ISP network. Other networks are unable to ping the ISP. Vlans are all using dhcp and management is using it too. i have 3 routers in the network excluding the ISP router which uses a different address. R1, R2 and R3
My network structure is as follows
Subnet
VLAN10 ------ 10.0.1.0 /24
VLAN15 ------ 10.0.2.0 /24
VLAN20 ------ 10.0.3.0 /24
Management -- 10.0.4.0 /24
Server ------- 10.0.5.0 /24
R1-R2 ------- 10.0.6.0 /24
R2-R3 ------- 10.0.7.0 /24
R1-R3 ------- 10.0.8.0 /24
PAT network
R3-ISP------- 209.165.100.30 | .17 respectively
where R1 holds all vlans 10,15,20
R2 holds management
R3 holds server and the Isp
all networks are able to ping with eachother just fine. aside from the ISP as mentioned. I am using EIGRP for this network.
---------------------------------------------------------------------
R1 ---> Show running config
hostname R1
!
ip dhcp excluded-address 10.0.0.1 10.0.0.11
ip dhcp excluded-address 10.0.1.1 10.0.1.11
ip dhcp excluded-address 10.0.1.129 10.0.1.139
ip dhcp excluded-address 10.0.2.1 10.0.2.11
ip dhcp excluded-address 10.0.3.1 10.0.3.11
!
ip dhcp pool VLAN10
network 10.0.1.0 255.255.255.0
default-router 10.0.1.1
ip dhcp pool VLAN15
network 10.0.2.0 255.255.255.0
default-router 10.0.2.1
ip dhcp pool VLAN20
network 10.0.3.0 255.255.255.0
default-router 10.0.3.1
!
no ip cef
no ipv6 cef
!
spanning-tree mode pvst
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0.1
encapsulation dot1Q 10
ip address 10.0.1.1 255.255.255.0
!
interface GigabitEthernet0/0.2
encapsulation dot1Q 15
ip address 10.0.2.1 255.255.255.0
!
interface GigabitEthernet0/0.3
encapsulation dot1Q 20
ip address 10.0.3.1 255.255.255.0
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0/0
ip address 10.0.6.1 255.255.255.0
!
interface Serial0/0/1
ip address 10.0.8.1 255.255.255.0
!
interface Serial0/1/0
no ip address
clock rate 2000000
shutdown
!
interface Serial0/1/1
no ip address
clock rate 2000000
shutdown
!
interface Vlan1
no ip address
shutdown
!
router eigrp 1
network 10.0.1.0 0.0.0.255
network 10.0.2.0 0.0.0.255
network 10.0.3.0 0.0.0.255
network 10.0.4.0 0.0.0.255
network 10.0.5.0 0.0.0.255
network 10.0.6.0 0.0.0.255
network 10.0.7.0 0.0.0.255
network 10.0.8.0 0.0.0.255
!
end
----------------------------------------------------
R2 -----> show running config
hostname R2
!
!
!
!
ip dhcp excluded-address 10.0.4.1 10.0.4.11
!
ip dhcp pool MANAGEMENT
network 10.0.4.0 255.255.255.0
default-router 10.0.4.1
!
no ip cef
no ipv6 cef
!
spanning-tree mode pvst
!
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
shutdown
!
interface GigabitEthernet0/1
ip address 10.0.4.1 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0/0
ip address 10.0.6.2 255.255.255.0
clock rate 2000000
!
interface Serial0/0/1
ip address 10.0.7.1 255.255.255.0
clock rate 2000000
!
interface Serial0/1/0
no ip address
clock rate 2000000
shutdown
!
interface Serial0/1/1
no ip address
clock rate 2000000
shutdown
!
interface Vlan1
no ip address
shutdown
!
router eigrp 1
network 10.0.1.0 0.0.0.255
network 10.0.2.0 0.0.0.255
network 10.0.3.0 0.0.0.255
network 10.0.4.0 0.0.0.255
network 10.0.5.0 0.0.0.255
network 10.0.6.0 0.0.0.255
network 10.0.7.0 0.0.0.255
network 10.0.8.0 0.0.0.255
!
ip classless
ip route 1.1.1.1 255.255.255.255 Serial0/0/1
!
ip flow-export version 9
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
end
------------------------------------------------------------------------------------------------
R3 show running-config
hostname R3
!
no ip cef
no ipv6 cef
!
spanning-tree mode pvst
!
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface GigabitEthernet0/0
ip address 10.0.5.1 255.255.255.0
ip access-group 1 out
ip nat inside
duplex auto
speed auto
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0/0
ip address 10.0.7.2 255.255.255.0
ip nat inside
!
interface Serial0/0/1
ip address 10.0.8.2 255.255.255.0
ip nat inside
clock rate 2000000
!
interface Serial0/1/0
ip address 209.165.100.30 255.255.255.240
ip nat outside
clock rate 2000000
!
interface Serial0/1/1
no ip address
clock rate 2000000
shutdown
!
interface Vlan1
no ip address
shutdown
!
router eigrp 1
network 10.0.1.0 0.0.0.255
network 10.0.2.0 0.0.0.255
network 10.0.3.0 0.0.0.255
network 10.0.4.0 0.0.0.255
network 10.0.5.0 0.0.0.255
network 10.0.6.0 0.0.0.255
network 10.0.7.0 0.0.0.255
network 10.0.8.0 0.0.0.255
!
ip nat inside source list 10 interface Serial0/1/0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Loopback1
!
ip flow-export version 9
!
access-list 10 permit 10.0.0.0 0.0.255.255
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
end
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I have posted a picture of my network below. Sorry about the post being kind of messy, its my first time posting on a cisco forum.
