Re: gsmtap design/extensions?

On Apr 12, 2019, at 10:15 AM, Johannes Berg johannes@sipsolutions.net wrote:

Agree. Sorry about that. No disrespect was intended, but I'm still not sure I understand the need for UDP encapsulation *as part of the protocol*. I guess saying "GSMTAP can optionally be encapsulated in UDP with the well-known port xyz" would be something else, and it'd make more sense to me than saying it has to be.

I see nothing about a struct gsmtap_hdr:

http://osmocom.org/projects/baseband/wiki/GSMTAP

that

1) requires that it plus the payload be encapsulated in a UDP datagram

or

2) would prevent it from being at the beginning of a LINKTYPE_GSMTAP/DLT_GSMTAP packet in a pcap or pcapng file.