Ask Your Question
0

Is the GRE tunnel ID carried over the network?

asked 2016-01-14 07:24:15 -0600

Dragos gravatar image

I would like to know if the tunnel ID is local to each endpoint of a tunnel or if it is carried over the network so that both endpoints know about it. If it is carried over the network, then is it placed in the GRE header (which field? Key?) or if there is an additional header for it

edit retag flag offensive close merge delete

1 answer

Sort by ยป oldest newest most voted
0

answered 2016-01-14 12:22:25 -0600

dbaxps gravatar image

updated 2016-01-14 12:36:48 -0600

edit flag offensive delete link more

Comments

Thanks, second link seems to indicate that the tunnel ID is carried in the GRE header. A search on Google lead me to an excerpt from "Learning OpenStack Networking" in Google Books. There it is written that the ID is stored in the GRE KEY field (32-bit). Does it imply tunnel_id_range 0 - 2^32?

Dragos gravatar imageDragos ( 2016-01-14 18:25:46 -0600 )edit

Take a look at https://tools.ietf.org/html/rfc2890. For myself ( not network engineer ) Assaf Muller blog is usually sufficient. It addresses a lot of Neutron work-flow detailed explanations, in particular, clear explanation of DVR and ARP Proxy functionality ( for instance ).

dbaxps gravatar imagedbaxps ( 2016-01-15 00:34:21 -0600 )edit

Yes, those blogs are very good in illustrating how various OpenStack components interact. But, I work with network research and sometimes it is necessary that I understand low-level details about network traffic. Thanks for links!

Dragos gravatar imageDragos ( 2016-01-15 01:39:41 -0600 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Get to know Ask OpenStack

Resources for moderators

Question Tools

1 follower

Stats

Asked: 2016-01-14 07:24:15 -0600

Seen: 627 times

Last updated: Jan 14 '16