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Liaison statement
Future Port Allocation Requests

Additional information about IETF liaison relationships is available on the Internet Architecture Board liaison webpage.
State Posted
Submitted Date 2021-05-24
From Group TSV
From Contact Martin Duke
To Contacts Lionel Morand <>
Susanna Kooistra <>
Cc Zaheduzzaman Sarker <>
The IETF Chair <>
Martin Duke <>
Response Contact Lars Eggert <>
Purpose In response
Attachments (None)
Liaisons referred by this one Reply LS on port allocation for the W1 interface
Thank you for your correspondence about port allocation. In your latest message
you write:

“However, besides the assignment of transport protocol port(s) that could be
requested by 3GPP for the deployment of specific service discovery
mechanism(s), it is also the 3GPP understanding that this statement cannot
prohibit 3GPP to request in the future a port assignment for a new service
application for which none of the port assignment alternatives would be

Your understanding is correct. Our previous statements on this subject are
intended to reduce port requests with a low chance of approval, but no party is
ever prohibited from requesting a port assignment. An application justified by
a particular use case, especially if that use case is deployed over the open
Internet, should be registered with IANA and will be evaluated in accordance
with IETF and IANA policy, just like any other request.