9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
How can view log messages between two time frame from /var/log/message or any type of log files.
when logfiles are very big and especially many messages with in few minutes, I would like to display log messages between 5 minute interval.
Could you pls give me the command? (1 Reply)
Discussion started by: johnveslin
Can anybody please tell me how I can figure out on a solaris server how long it would take a TCP SYN request to timeout before it gets a SYN_ACK back?
Thanks, (3 Replies)
Discussion started by: Pouchie1
3. UNIX for Dummies Questions & Answers
I am using vim version 7.1.314.It don't have syn on.Is there any plug in available for syn on or I have to update the version. (2 Replies)
Discussion started by: karthigayan
4. UNIX for Dummies Questions & Answers
I have a script that call another, the other displays de message and I can print directly to the flat file, but in one command I am searchig that this message can be displayed in the screen and in the flat file in one command.
I am doing something like this:
var=$(./Example.sh)... (2 Replies)
Discussion started by: pipoca
5. Shell Programming and Scripting
I have to redirect STDERR messages both to screen and also capture the same in a file.
2 > &1 | tee file works but it also displays the non error messages to file, while i only need error messages.
Can anyone help?? (10 Replies)
Discussion started by: vikashtulsiyan
6. UNIX for Advanced & Expert Users
Please tell me details about terms FIN, ACK, SYN, RST; used in TCP based communication. Also tell me any RFC or other document which tell me details about these terms. (1 Reply)
Discussion started by: mansoorulhaq
7. Shell Programming and Scripting
suppose I have data in a log file in the below format
is it possible to create a search engine which takes input as three filters out of which two filters should be optional?
say i give... (4 Replies)
Discussion started by: wannalearn
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
I'm trying to create a RAW TCP SYN packet and send it from one Linux machine to another. I know the packet I have created is well formed and is received by the peer.
Now what I want is to get an ACK for my SYN. I want the peer's Network protocol stack to send me an ACK for that. I know... (17 Replies)
Discussion started by: zampya
TCPDROP(8) BSD System Manager's Manual TCPDROP(8)
tcpdrop -- drop TCP connections
tcpdrop local-address local-port foreign-address foreign-port
tcpdrop [-l] -a
The tcpdrop command may be used to drop TCP connections from the command line.
If -a is specified then tcpdrop will attempt to drop all active connections. The -l flag may be given to list the tcpdrop invocation to drop
all active connections one at a time.
If -a is not specified then only the connection between the given local address local-address, port local-port, and the foreign address
foreign-address, port foreign-port, will be dropped.
Addresses and ports may be specified by name or numeric value. Both IPv4 and IPv6 address formats are supported.
The addresses and ports may be separated by periods or colons instead of spaces.
The tcpdrop utility exits 0 on success, and >0 if an error occurs.
If a connection to httpd(8) is causing congestion on a network link, one can drop the TCP session in charge:
# sockstat -c | grep httpd
www httpd 16525 3 tcp4
The following command will drop the connection:
# tcpdrop 192.168.5.41 80 192.168.5.1 26747
The following command will drop all connections but those to or from port 22, the port used by sshd(8):
# tcpdrop -l -a | grep -vw 22 | sh
Markus Friedl <firstname.lastname@example.org>
Juli Mallett <jmallett@FreeBSD.org>
January 30, 2013 BSD