Routing

Hi all.

I have a topo like this

R1----------R2

R1 and R2 are running ospf together. But, I'm not allowed to login to R2, from R1 I know R2 is configured with authentication key.

Is there any way from R1 to know or to catch this key ? Or in short way, to make R1 and R2 establishes neighbor.

I meet this question in JNCIE-lab.

If R2 is configured with simple authentication you can see the key in ospf hello. Take a packet capture on R1 and check the hello from R2.

If R2 is using MD5, you can get the hash only.

Taking a pcap on SRX will help you to identify this.

below commad can be used to capture the ospf hello, files will be written into your home directory.

user@host> monitor traffic interface ge-x/x/x matching "proto 89" write-file ospf.cap extensive

I have attached a sample capture .

Thanks,

Suraj

Please Mark My Solution Accepted if it Helped, Kudos are Appreciated too

Hi hoand,

U break NDA, next time please more careful

Oh, Kindly sorry about this. Thanks so much for your remind.