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 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 (36) Comments
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    October 21st, 2016

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    October 24th, 2016

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    October 24th, 2016

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  7. Eddy
    October 31st, 2016

    @Fred Relay
    that is how frame relay works. spokes connect to hub.. R2 is spoke and R1 is hub, and as explained, you can do the commnad on interface or under ospf. Both have to be the same on both ends

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    November 6th, 2016

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    November 6th, 2016

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    Trace from client 1 system was not working.

    Nice strategy by CCNP-1000 guy :

    ———————————————————-______________________________________________________________________
    You have to ask your self Is it ipv4 or ipv6?
    If IPv6 you have these 3 questions, 1 each on
    R2: (T12) IPv6: enable ospf 0
    R3: (T15) IPv6: remove “tunnel mode ipv6″
    R4: (T16) missing Redistribution from RIPng to OSPFv3
    If its IPv4 do the following to narrow it down:
    From Client 1 ping 10.1.1.1 if its :
    OK? = 3 tickets on R1:
    (T03) Wrong IP of BGP neighbour
    (T04) NAT – ACL mis-configured
    (T05) WAN ACL statement missing
    If you cant ping 10.1.1.1 try to ping 10.1.1.2 from client 1
    OK? = 1 ticket on R1:
    (T01) OSPF Authentication
    If you cant ping 10.1.1.2 try to ping 10.2.1.1 from client 1
    OK? = 2 tickets on R4:
    (T11) Redistribute ospf to eigrp (“to” & -> )
    (T14) EIGRP Passive Interface
    If you cant ping 10.2..1.1 you have 4 ticket as follow:
    NO? = 1 ticket on DSW1:
    (T06) VLAN filter
    or = 3 tickets on ASW1:
    (T08) Access port not in VLAN 10
    (T09) Port Channel not allowing VLAN 10,200
    (T07) Port Security

    ———————————————————————-

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    November 27th, 2016

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    December 3rd, 2016

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    December 6th, 2016

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    December 7th, 2016

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    December 13th, 2016

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    December 17th, 2016

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  29. elhombre2016
    December 17th, 2016

    @ALL best thing to do for the authentication problem on Router one is do the “show ip ospf neighbor” command on both R1 and R2, if they don’t see each other as neighbors than check the authentication “sh run”. For the HSRP do a “show standby” command or just look under vlan10.

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    January 1st, 2017

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    January 10th, 2017

    Good Day!
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  34. Anonymous
    January 14th, 2017

    two new tickets but same topology. BGP Neighbor ticket is not there

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    January 16th, 2017

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  36. anon
    January 16th, 2017

    Where is the network diagram for this question?

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