01-07-2014
6 More Discussions You Might Find Interesting
1. Cybersecurity
!HELLO ,
What is the maximum number of hosts on a TCP/IP internet?
plz can u help me.
:rolleyes: (2 Replies)
Discussion started by: smdakram
2 Replies
2. Programming
I'm sending a SYN packet and now I want to specify the MSS (The maximum segment size option in a TCP packet ) through it.
How can I do that? Also, I'm not getting a SYN-ACK back from the remote host. TCPDUMP tells me that my packet is good and is a SYN. Then, why don't I get back the SYN-ACK? I... (0 Replies)
Discussion started by: zampya
0 Replies
3. Linux
Hi all,
A security scanner has been done on a linux server and have found that
The remote host does not discard RCP SYN packets which have the FIN flag set.
It tells that I need to request a patch which I haven't found yet.
I have Red Hat Linux release 7.0 (Guinness)
Kernel 2.2.16-22... (2 Replies)
Discussion started by: bert.n
2 Replies
4. IP Networking
I have written a TCP/IP client and server program. The client sends a message to the server and then the server sends a file back to the client. The client reads the buffer and stores it another file in the client side.
I need to know what are the various exceptions that I need to handle in... (0 Replies)
Discussion started by: Rajeshsu
0 Replies
5. IP Networking
The client's app gets a 'suspend error' which they say is due to a null pointer exception. Application people say nothing's wrong with the app. Network people say the network's fine. I'm supposed to see what's wrong with the system to be causing this error. I checked the NIC card settings, which... (1 Reply)
Discussion started by: pmichner
1 Replies
6. Solaris
I have problem with oracle solaris 10 running on oracle sparc T4-2 server.
Os information: 5.10 Generic_150400-03 sun4v sparc sun4v
Output from tcpstat.d script
TCP bytes: out outRetrans in inDup inUnorder
6833763 7300 98884 0... (2 Replies)
Discussion started by: insatiable1610
2 Replies
LEARN ABOUT OPENSOLARIS
synos
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)