Home > Ticket 1 – OSPF Authentication

Ticket 1 – OSPF Authentication

May 6th, 2018 Go to comments

1.Client is unable to ping R1’s serial interface from the client.

Problem was disable authentication on R1, check where authentication is not given under router ospf of R1. (use ipv4 Layer 3)

Configuration of R1:

interface Serial0/0/0
 description Link to R2
 ip address 10.1.1.1 255.255.255.252
 ip nat inside
 encapsulation frame-relay
 ip ospf message-digest-key 1 md5 TSHOOT
 ip ospf network point-to-point
!
router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
 network 10.1.2.0 0.0.0.255 area 12
 network 10.1.10.0 0.0.0.255 area 12
 default-information originate always
!

Configuration of R2:
interface Serial0/0/0.12 point-to-point
 ip address 10.1.1.2 255.255.255.252
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 TSHOOT
!

Answer: on R1 need command ip ospf authentication message-digest”

Ans1) R1
Ans2) IPv4 OSPF Routing
Ans3) Enable OSPF authentication on the s0/0/0 interface using the “ip ospf authentication message-digest” command.

Note:

There are two ways of configuring OSPF authentication:

interface Serial0/0/0
  ip ospf message-digest-key 1 md5 TSH00T
!
router ospf 1
  area 12 authentication message-digest

OR

interface Serial0/0/0
  ip ospf authentication message-digest
  ip ospf message-digest-key 1 md5 TSH00T

So you have to check carefully in both interface mode and “router ospf 1”. If none of them has authentication then it is a fault.

Comments (26) Comments
  1. Anonymous
    January 11th, 2020

    Hello all,
    Concerning the Ticket 1(OSPF Authentication) and following the giving configuration and following the premium access i have, the issue is not related to ospf authentiction but issue ie coming from the ospf bad network statement configured in ospf prcess in R1

    any comment please?
    Thanks

  2. Z-BLOCK
    January 11th, 2020

    Has anybody noticed on the actual exam that Router 2 shows “Area has no authentication” for Area 12 when it should show message digest authentication? Did I mis-see that in in my exam?

  3. Anonymous
    January 18th, 2020

    Hola
    rendi el Tshoot antiguo hace varios años atrás. En el actual se puede usar “tracer” desde el PC? o solo desde los Routers, o simplemente no se puede usar tracer?

    de antemano gracias.

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    January 21st, 2020

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  5. @Anonymous
    January 23rd, 2020

    Creo que “tracert” no funciona desde el Client1 pero realmente no lo necesitas.

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    February 5th, 2020

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    February 7th, 2020

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    February 11th, 2020

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    February 11th, 2020

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    February 12th, 2020

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  11. Ammar
    February 13th, 2020

    how many questions in the premium account,
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  12. Cocopost
    February 15th, 2020

    The network statements are mis-matched in this config.
    R1:
    network 10.1.2.0 0.0.0.255 area 12
    network 10.1.10.0 0.0.0.255 area 12
    Doesnt enable the interface toward R2.

    Regardless of authentication An OSPF neighborship would never form.
    interface Serial0/0/0
    description Link to R2
    ip address 10.1.1.1 255.255.255.252

    please correct me if I am wrong about this.

  13. Jeff
    February 16th, 2020

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    February 16th, 2020

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    February 17th, 2020

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    February 17th, 2020

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    February 17th, 2020

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    February 17th, 2020

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    February 17th, 2020

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    February 17th, 2020

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  23. Anonymous
    February 19th, 2020

    @Cocopost

    no, the OSPF is enabled under the interface serial 0/0/0

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