Escenario de práctica CCNA4

Fecha 13/8/2011 Resultados del escenario resuelto por Daniel Zulián

 

           

                Este es un escenario sencillo, que abarca varios de los temas dados en el transcurso del semestre y algún otro

tema de Exploration 2, la idea fue resolverlo en forma individual, en menos de una hora sin ayuda de compañeros.

 

            Configuraciones:

 

            !

hostname Gateway

!

ip dhcp excluded-address 10.0.0.1

!

ip dhcp pool DHCP

 network 10.0.0.0 255.255.240.0

 default-router 10.0.0.1

!

username Backup password 0 cisco123 (OK)

!

interface FastEthernet0/0

 ip address 10.0.0.1 255.255.240.0

!

interface Serial0/0/0

 bandwidth 2048 (OK)

 ip address 172.16.0.1 255.255.255.252

 clock rate 64000

!

interface Serial0/0/1

 bandwidth 512 (OK)

 ip address 172.16.0.5 255.255.255.252

 encapsulation ppp (OK)

 ppp authentication chap (OK)

 clock rate 64000

!

router eigrp 100

 passive-interface FastEthernet0/0 (OK)

 network 10.0.0.0 0.0.15.255 (OK)

 network 172.16.0.0 0.0.0.3

 network 172.16.0.4 0.0.0.3

 no auto-summary (OK)

!

end

 

!

hostname Principal

!

username Gateway password 0 cisco123 (no es necesario)

username ISP password 0 cisco123 (no es necesario)

!

interface Serial0/0/0

 bandwidth 2048 (OK)

 ip address 172.16.0.2 255.255.255.252

!

interface Serial0/0/1

 bandwidth 1048 (suponemos error de tipeo: 2048)

 ip address 10.0.16.1 255.255.255.252

 clock rate 64000

!

router eigrp 100

 network 10.0.16.0 0.0.0.3

 network 172.16.0.0 0.0.0.3

 no auto-summary (OK)

!

end

 

!

hostname Backup

!

username Gateway password 0 cisco123

username ISP password 0 cisco123

!

interface Serial0/0/0

 bandwidth 512 (OK)

 ip address 10.0.16.5 255.255.255.252

 encapsulation ppp (OK)

 ppp authentication chap (OK)

 clock rate 64000

!

interface Serial0/0/1 (faltó el band 512)

 ip address 172.16.0.6 255.255.255.252

 encapsulation ppp (OK)

 ppp authentication chap (OK)

!

router eigrp 100

 network 172.16.0.4 0.0.0.3

 network 10.0.16.4 0.0.0.3

 no auto-summary (OK)

!

end

 

!

hostname ISP

!

username Backup password 0 cisco123 (OK)

!

interface Serial0/0/0

 bandwidth 512 (OK)

 ip address 10.0.16.6 255.255.255.252

 encapsulation ppp (OK)

 ppp authentication chap (OK)

 ip nat inside (OK)

!

interface Serial0/0/1

 bandwidth 2048 (OK)

 ip address 10.0.16.2 255.255.255.252

 ip nat inside (OK)

!

interface Serial0/1/0

 ip address 190.0.0.1 255.255.255.252

 encapsulation frame-relay (OK)

 frame-relay map ip 190.0.0.2 100 (agregado/sugerido por instructor)

 frame-relay map ip 200.0.0.1 100(agregado/sugerido por instructor)

 ip nat outside (OK)

!

router eigrp 100

 redistribute static  (OK)

 passive-interface Serial0/1/0 (OK)

 network 10.0.16.0 0.0.0.3

 network 10.0.16.4 0.0.0.3

 no auto-summary (OK)

!

ip nat inside source list 1 interface Serial0/1/0 overload (OK)

!

ip route 200.0.0.0 255.255.255.252 Serial0/1/0  (OK)

!

access-list 1 permit 10.0.0.0 0.0.15.255 (OK)

!

end

 

!

hostname Hosting

!

interface FastEthernet0/0

 ip address 192.168.0.1 255.255.255.0

 ip nat inside (OK)

!

interface Serial0/0/0

 ip address 190.0.0.2 255.255.255.252

 encapsulation frame-relay (OK)

 frame-relay map ip 190.0.0.1 200 (agregado/sugerido por instructor)

 ip nat outside (OK)

!

ip nat inside source static 192.168.0.10 200.0.0.1  (OK)

!

ip route 0.0.0.0 0.0.0.0 Serial0/0/0  (OK)

!

end

 

 

 

Prueba del escenario

 

 

Hosting#sh ip nat translations

Pro  Inside global     Inside local       Outside local      Outside global

---  200.0.0.1         192.168.0.10       ---                ---

tcp 200.0.0.1:80       192.168.0.10:80    190.0.0.1:1025     190.0.0.1:1025

 

Hosting#

 

ISP#sh ip nat translations

Pro  Inside global     Inside local       Outside local      Outside global

tcp 190.0.0.1:1025     10.0.0.2:1025      200.0.0.1:80       200.0.0.1:80

 

ISP#sh ip route

 

     10.0.0.0/8 is variably subnetted, 4 subnets, 3 masks

D       10.0.0.0/20 [90/2276352] via 10.0.16.1, 00:14:20, Serial0/0/1

C       10.0.16.0/30 is directly connected, Serial0/0/1

C       10.0.16.4/30 is directly connected, Serial0/0/0

C       10.0.16.5/32 is directly connected, Serial0/0/0

     172.16.0.0/30 is subnetted, 2 subnets

D       172.16.0.0 [90/2273792] via 10.0.16.1, 00:14:20, Serial0/0/1

D       172.16.0.4 [90/6023936] via 10.0.16.5, 00:14:22, Serial0/0/0

     190.0.0.0/30 is subnetted, 1 subnets

C       190.0.0.0 is directly connected, Serial0/1/0

     200.0.0.0/30 is subnetted, 1 subnets

S       200.0.0.0 is directly connected, Serial0/1/0

ISP#

 

ISP#sh frame-relay map

Serial0/1/0 (up): ip 190.0.0.2 dlci 100, static, CISCO, status defined, active

Serial0/1/0 (up): ip 200.0.0.1 dlci 100, static, CISCO, status defined, active

ISP#

 

Hosting#sh frame-relay map

Serial0/0/0 (up): ip 190.0.0.1 dlci 200, static, CISCO, status defined, active

Hosting#

 

PC>tracert 200.0.0.1

 

Tracing route to 200.0.0.1 over a maximum of 30 hops:

 

  1   32 ms     31 ms     15 ms     10.0.0.1 (router Gateway)

  2   62 ms     63 ms     63 ms     172.16.0.2 (router Pricipal)

  3   94 ms     94 ms     94 ms     10.0.16.2 (router ISP)

  4   156 ms    125 ms    143 ms    200.0.0.1 (router con static NAT)

  5   187 ms    188 ms    188 ms    200.0.0.1 (host detrás del NAT )

 

Trace complete.

 

Vínculo principal down:

 

ISP#

 

%LINK-5-CHANGED: Interface Serial0/0/1, changed state to down

 

%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1, changed state to down

 

%DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 10.0.16.1 (Serial0/0/1) is down: interface down

      

ISP#

 

ISP#sh ip route

 

Gateway of last resort is not set

 

     10.0.0.0/8 is variably subnetted, 3 subnets, 3 masks

D       10.0.0.0/20 [90/6026496] via 10.0.16.5, 00:16:56, Serial0/0/0

C       10.0.16.4/30 is directly connected, Serial0/0/0

C       10.0.16.5/32 is directly connected, Serial0/0/0

     172.16.0.0/30 is subnetted, 1 subnets

D       172.16.0.4 [90/6023936] via 10.0.16.5, 00:16:56, Serial0/0/0

     190.0.0.0/30 is subnetted, 1 subnets

C       190.0.0.0 is directly connected, Serial0/1/0

     200.0.0.0/30 is subnetted, 1 subnets

S       200.0.0.0 is directly connected, Serial0/1/0

ISP#

 

PC>tracert 200.0.0.1

 

Tracing route to 200.0.0.1 over a maximum of 30 hops:

 

  1   31 ms     31 ms     32 ms     10.0.0.1

  2   47 ms     47 ms     62 ms     172.16.0.6 (router Backup)

  3   94 ms     93 ms     81 ms     10.0.16.6

  4   141 ms    156 ms    140 ms    200.0.0.1

  5   187 ms    187 ms    187 ms    200.0.0.1

 

Trace complete.

 

SERVER>netstat

 

Active Connections

 

  Proto  Local Address          Foreign Address        State

  TCP    192.168.0.10:80        190.0.0.1:1026         CLOSED

SERVER>

 

Solución original (por Daniel Zulián)

 

 

Nota del insructor: recalco en buscar los significados de proactivo o expeditivo, siendo esta la calificación que le

aplico a esta solución para descartar puntos de fallas, o verificar el funcionamiento de los sectores ya resueltos.

No es sólo una prueba con un link mas sencillo, verificando el funcionamiento de extremo a extremo, sino realizando

una contraprueba para verificar la reincidencia de la falla. Es generalmente, el método que yo utilizo.

 

    

 

   ISP#sh int s0/1/0

   Serial0/1/0 is up, line protocol is up (connected)

     Hardware is HD64570

     Internet address is 190.0.0.1/30

     MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

     Encapsulation HDLC, loopback not set, keepalive set (10 sec)

     Last input never, output never, output hang never

     Last clearing of "show interface" counters never

 

 

 

(2011) Definitely talk about networking not attract pretty girls

Rosario, Argentina