SCTP Administrator's Guide

Table 1-1 SCTP Parameters Supported by the ndd Command (continued)
DescriptionParameter
Specifies the default average time (in milliseconds)
between the two consecutive heartbeat requests. If
this is set to 0, then heartbeats are disabled by
default. However, the heartbeats are still used for
address confirmation.
NOTE: The time between two consecutive
heartbeats is jittered at random. As a result,
heartbeats will not occur at the exact time.
Moreover, the interval spans across all addresses
in an association. If there are several addresses, it
will take long time before a heartbeat is sent to the
same address again.
sctp_hb_interval
Specifies the maximum number of 'Path MTUs' of
new data that can be sent at a time.
sctp_max_burst
Specifies the time to wait (in milliseconds) before
sending a SACK packet, to acknowledge the
received data. The SACK timer may not have to
prompt for sending a SACK, because SACK is sent
very frequently (for every two packets)
sctp_ack_delay
Specifies the time to wait (in milliseconds) for other
data chunks to bundle in the same packet. The data
is sent without waiting for this time-out if the
amount outstanding is more than the threshold, or
if bundling is disabled ('no delay' option). This
parameter can be configured by an SCTP user using
the per-association option.
sctp_bundle_timer
Specifies the duration (in milliseconds) for which a
COOKIE parameter sent in an INIT ACK is valid for.
The COOKIE must be returned in a COOKIE ECHO
message before this period ends, or it is considered
stale.
sctp_val_cookie_life
Specifies the maximum value (in milliseconds) that
is added to the default life of a COOKIE (see
sctp_val_cookie_life) sent (in an INIT ACK) as a
response to an INIT, which has a Cookie
Preservative parameter. If the time specified in the
Cookie Preservative parameter is more than this
value, then sctp_max_cookie_pres is used instead. If
the value is 0, the Cookie Preservative Parameter in an
incoming INIT is ignored.
sctp_max_cookie_pres
20 Introduction