Routeur 1 | ipv4

```
interface Serial0/0
 encapsulation ppp
 ip address 192.168.12.1 255.255.255.0
 no shutdown
 description ## to R2 ##

interface Serial0/1
 encapsulation ppp
 ip address 192.168.51.1 255.255.255.0
 no shutdown
 description ## to R5 ##

ip route 0.0.0.0 0.0.0.0 192.168.12.2


```

Routeur 2 | ipv4

```
interface Serial0/0
 encapsulation ppp
 ip address 192.168.12.2 255.255.255.0
 no shutdown
 description ## to R1 ##

interface Serial0/1
 encapsulation ppp
 ip address 192.168.23.2 255.255.255.0
 no shutdown
 description ## to R3 ##

ip route 0.0.0.0 0.0.0.0 192.168.22.1



```

Routeur 3 | ipv4

```
interface Serial0/1
encapsulation ppp
ip address 192.168.23.1 255.255.255.0
no shutdown
description ## to R2 ##

interface Serial0/0
encapsulation ppp
ip address 192.168.34.2 255.255.255.0
no shutdown
description ## to R4 ##

ip route 0.0.0.0 0.0.0.0 192.168.34.1


```

Routeur 4 | ipv4

```
interface Serial0/0
 encapsulation ppp
 ip address 192.168.45.2 255.255.255.0
 no shutdown
 description ## to R5 ##

interface Serial0/1
 encapsulation ppp
 ip address 192.168.34.1 255.255.255.0
 no shutdown
 description ## to R3 ##

ip route 0.0.0.0 0.0.0.0 192.168.45.1


```

Routeur 5 | ipv4

```
interface Serial0/1
 encapsulation ppp
 ip address 192.168.51.2 255.255.255.0
 no shutdown
 description ## to R1 ##

interface Serial0/0
 encapsulation ppp
 ip address 192.168.45.1 255.255.255.0
 no shutdown
 description ## to R4 ##


ip route 0.0.0.0 0.0.0.0 192.168.51.1

```