cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
1368
Views
0
Helpful
2
Replies

Log--> Received a TCP packet with invalid MD5 digest

allanc16
Level 1
Level 1

Hello,

I am receiving the following log on a router, could it be a password mismatch between the peers?

 

SOCKET/6/SOCKET_TCP_MD5_INVALID: Received a TCP packet with invalid MD5 digest. Source: x.x.x.x:179, Destination: x.x.x.x:1129.

2 Replies 2

Peter Paluch
Cisco Employee
Cisco Employee

Hi Allan,

Definitively, this is a password mismatch between two BGP speakers, on of them being you and the other the one indicated in the logging message. Please double-check the password as specified in the neighbor X.X.X.X password password command in your BGP process, making sure it matches the reciprocally configured password on the remote BGP speaker.

BGP uses an atypical authentication where entire TCP segments are signed. No other IP-based routing protocol uses a similar approach, that is why these errors can be confusing - you don't see them often.

Best regards,
Peter

Thank you Paluch i will work on it!

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco