03-23-2012
Dear zxmaus
Thanks for your help!
You are right, the parameter tcp_deferred_ack_interval may equal to tcp_nodelayack.
but I am not sure tcp_deferred_ack_max is equal to tcp_nagle_limit
because I find a Solaris document(
tcp_deferred_acks_max) ,
that has "tcp_deferred_ack_max" parameter's description:
(I compare it with AIX no man page.)
Quote:
Species the maximum number of TCP segmentsreceived from
remote destinations(not directly connected) before an acknowledgment(ACK)is generated.
TCP segments are measured in units of maximum segmentsize(MSS) for individual connections.
If set to 0 or 1,no ACKs are delayed,assuming all segments are 1 MSS long.
The actual number is dynamically calculated for each connection.
The value is the default maximum.
Quote:
tcp_nagle_limit
Purpose:
This is the Nagle Algorithm threshold in bytes which can be used to disable Nagle.
Tuning:
The default is Nagle turned on. To disable Nagle, set this value to 0 or 1. TCP disables Nagle for data segments larger than or equal to this threshold value.
Any suggestion ?
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synos(1) Mail Avenger 0.8.3 synos(1)
NAME
synos - guess operating system from TCP SYN fingerprint
SYNOPSIS
synos [--mtu mtu] [--db path] syn-fingerprint
DESCRIPTION
synos takes a SYN fingerprint, in the format described for the CLIENT_SYNFP environment variable in the avenger(1) man page, and outputs a
guess as to the type of the client operating system. synos makes use of the OpenBSD SYN fingerprint database (which is also repackaged
with Mail Avenger).
OPTIONS
--mtu val
Certain operating systems set the initial TCP window size based on the maximum transmission unit, or MTU, of the network. For such
operating systems, synos usually checks the window size using both the client's MSS option plus 40 bytes (for TCP and IP headers), or a
hard-coded MTU, which defaults to 1,500 bytes. If either value works, the fingerprint is considered to match the operating system.
You can change the value 1,500 by specifying this option. A value of 0 tells synos to use only the value derived from the MSS option.
--db file
Specifies an alternate location for the SYN fingerprint database.
FILES
/usr/local/share/pf.os
Default location of SYN fingerprint database.
SEE ALSO
avenger(1), asmtpd(8)
The Mail Avenger home page: <http://www.mailavenger.org/>.
The OpenBSD home page: <http://www.openbsd.org/>.
BUGS
The operating system type is determined by heuristics that are not always reliable. Moreover, not all operating systems can be
distinguished. The database may not even contain a client's particular operating system and version.
It is not hard to fool synos deliberately by changing TCP socket options or injecting raw packets onto the network.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 synos(1)