Home > Ticket 1 – OSPF Authentication

Ticket 1 – OSPF Authentication

March 30th, 2015 in TSHOOT v2 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
 ip nat inside
 encapsulation frame-relay
 ip ospf message-digest-key 1 md5 TSHOOT
 ip ospf network point-to-point
router ospf 1
 network area 12
 network area 12
 default-information originate always

Configuration of R2:
interface Serial0/0/0.12 point-to-point
 ip address
 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.


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


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 (14) Comments
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    June 3rd, 2017

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    June 10th, 2017

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    June 16th, 2017

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  6. Anonymous
    July 3rd, 2017

    Hello NetTut, R4 should not have learned via ospf because there are no ospf neighbors between R1 and R2 and R1 is the only one who advertises default route into internal network via OSPF with “default-information originate always”

  7. Nick
    July 15th, 2017

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    July 17th, 2017

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  13. Peter
    August 2nd, 2017

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    August 12th, 2017


    R1 ospf does not cover range.

    so we have 2 problems that ip ospf authen and network for

    how do we determine to choose one of those ?

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