target = "https://www.rfc-editor.org/rfc/rfc9000#section-14.2"

# 14.2.  Path Maximum Transmission Unit
#
# The PMTU is the maximum size of the entire IP packet, including the
# IP header, UDP header, and UDP payload.  The UDP payload includes one
# or more QUIC packet headers and protected payloads.  The PMTU can
# depend on path characteristics and can therefore change over time.
# The largest UDP payload an endpoint sends at any given time is
# referred to as the endpoint's maximum datagram size.
# 
# An endpoint SHOULD use DPLPMTUD (Section 14.3) or PMTUD
# (Section 14.2.1) to determine whether the path to a destination will
# support a desired maximum datagram size without fragmentation.  In
# the absence of these mechanisms, QUIC endpoints SHOULD NOT send
# datagrams larger than the smallest allowed maximum datagram size.
# 
# Both DPLPMTUD and PMTUD send datagrams that are larger than the
# current maximum datagram size, referred to as PMTU probes.  All QUIC
# packets that are not sent in a PMTU probe SHOULD be sized to fit
# within the maximum datagram size to avoid the datagram being
# fragmented or dropped [RFC8085].
# 
# If a QUIC endpoint determines that the PMTU between any pair of local
# and remote IP addresses cannot support the smallest allowed maximum
# datagram size of 1200 bytes, it MUST immediately cease sending QUIC
# packets, except for those in PMTU probes or those containing
# CONNECTION_CLOSE frames, on the affected path.  An endpoint MAY
# terminate the connection if an alternative path cannot be found.
# 
# Each pair of local and remote addresses could have a different PMTU.
# QUIC implementations that implement any kind of PMTU discovery
# therefore SHOULD maintain a maximum datagram size for each
# combination of local and remote IP addresses.
# 
# A QUIC implementation MAY be more conservative in computing the
# maximum datagram size to allow for unknown tunnel overheads or IP
# header options/extensions.

[[spec]]
level = "SHOULD"
quote = '''
An endpoint SHOULD use DPLPMTUD (Section 14.3) or PMTUD
(Section 14.2.1) to determine whether the path to a destination will
support a desired maximum datagram size without fragmentation.
'''

[[spec]]
level = "SHOULD"
quote = '''
In
the absence of these mechanisms, QUIC endpoints SHOULD NOT send
datagrams larger than the smallest allowed maximum datagram size.
'''

[[spec]]
level = "SHOULD"
quote = '''
All QUIC
packets that are not sent in a PMTU probe SHOULD be sized to fit
within the maximum datagram size to avoid the datagram being
fragmented or dropped [RFC8085].
'''

[[spec]]
level = "MUST"
quote = '''
If a QUIC endpoint determines that the PMTU between any pair of local
and remote IP addresses cannot support the smallest allowed maximum
datagram size of 1200 bytes, it MUST immediately cease sending QUIC
packets, except for those in PMTU probes or those containing
CONNECTION_CLOSE frames, on the affected path.
'''

[[spec]]
level = "MAY"
quote = '''
An endpoint MAY
terminate the connection if an alternative path cannot be found.
'''

[[spec]]
level = "SHOULD"
quote = '''
QUIC implementations that implement any kind of PMTU discovery
therefore SHOULD maintain a maximum datagram size for each
combination of local and remote IP addresses.
'''

[[spec]]
level = "MAY"
quote = '''
A QUIC implementation MAY be more conservative in computing the
maximum datagram size to allow for unknown tunnel overheads or IP
header options/extensions.
'''