Task 2.1 - Where does the password CISCO come from?

Guys,

SG uses password CISCO for OSPF authentication?
Do you know where it comes from? Or it's just arbitrarily chosen?

 

Comments

  • Arbitrarily selected for this case!

    Good luck with your studies!

  • Okay. I thought I was missing something.

    Thanks

  • Is it necessary to specifiy a password? It appears as though a null key is used. The task didn't specify one, so I didn't use one. My verification output is the same as the SG with no key configured on either side:


    Rack8R6#sh ip ospf int f0/1.26

    .. snip ..


    Neighbor Count is 1, Adjacent neighbor count is 1

        Adjacent with neighbor 150.8.2.2  (Backup Designated Router)

      Suppress hello for 0 neighbor(s)

      Simple password authentication enabled

     

    When I configure a key on R6, this follows:

     

    (No Key on R2)


    Rack8R2#

    *Jan  5 15:41:36.848: OSPF: Rcv pkt from 174.8.26.6, FastEthernet0/0.26 : Mismatch Authentication Key - Clear Text

     

    ("CISCO" key on R6)


    Rack8R6#

    *Jan  5 16:09:13.520: OSPF: Rcv pkt from 174.8.26.2, FastEthernet0/1.26 : Mismatch Authentication Key - Clear Text


  • I enabled simple password authentication on the interfaces without specifying an authentication-key on either end, and the neighbor relationship authenticated and came up.  Does OSPF use a null key or something in these situations?

    interface FastEthernet0/0.26
     encapsulation dot1Q 26
     ip address 174.1.26.2 255.255.255.0
     no ip proxy-arp
     ip pim sparse-dense-mode
     ip multicast helper-map broadcast 239.254.2.5 105
     ip ospf authentication
     glbp 1 ip 174.1.26.254
     glbp 1 preempt
    end

    Rack1R2#sh ip ospf int f0/0.26
    FastEthernet0/0.26 is up, line protocol is up
      Internet Address 174.1.26.2/24, Area 0
      Process ID 1, Router ID 150.1.2.2, Network Type BROADCAST, Cost: 1
      Transmit Delay is 1 sec, State DR, Priority 1
      Designated Router (ID) 150.1.2.2, Interface address 174.1.26.2
      Backup Designated router (ID) 150.1.6.6, Interface address 174.1.26.6
      Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
        oob-resync timeout 40
        Hello due in 00:00:09
      Supports Link-local Signaling (LLS)
      Index 3/3, flood queue length 0
      Next 0x0(0)/0x0(0)
      Last flood scan length is 4, maximum is 16
      Last flood scan time is 0 msec, maximum is 4 msec
      Neighbor Count is 1, Adjacent neighbor count is 1
        Adjacent with neighbor 150.1.6.6  (Backup Designated Router)

      Suppress hello for 0 neighbor(s)
      Simple password authentication enabled

  • Does OSPF use a null key or something in these situations?

     

    Yes. According to the output of Wireshark below, OSPF uses simple
    password authentication along with a null password as mentioned in the Auth Data field.

     

    Open Shortest Path First

        OSPF Header

            OSPF Version: 2

            Message Type: Hello Packet (1)

            Packet Length: 44

            Source OSPF Router: 1.2.3.2 (1.2.3.2)

            Area ID: 0.0.0.0 (Backbone)

            Packet Checksum: 0xe495 [correct]

            Auth Type: Simple password

            Auth Data:            <------------------- Null value

        OSPF Hello Packet

        OSPF LLS Data Block

     

     

    Just my 2 cents.

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