[netconf] ietf-netconf-server and ietf-netconf-client keepalives

[Michal Vaško <[e-mail]>]

Hi,
in the current YANG modules in the drafts, there are 3 types of keepalives defined for both a server and a client. They are SSH, TLS, and TCP keepalives and can be configured separately for each connection (endpoint).

While I understand what TCP keepalive is as it is a feature with exact definition, I am not that positive for SSH nor TLS. I can only assume the keepalive mechanisms from a Call Home [1] server are used. I would appreciate if the modules define the specifics of all these keepalives because otherwise interoperability cannot be guaranteed. Also, the relation to the Call Home RFC itself should probably be mentioned somewhere. Meaning the answers to questions such as whether SHOULD each RESTCONF/NETCONF server use SSH/TLS keepalive even when a TCP keepalive is enabled. I am also not sure about the need for all 3 types of keepalives, needing to specify them for each connection , or allowing to support 2 kinds simultaneously, but that is just my opinion.

Thanks for any feedback. It is also possible I may have missed something/am wrong and I am sorry in that case.

Regards,
Michal

[1] https://tools.ietf.org/html/rfc8071#page-8