"The --data-length option can be used to send a fixed-length random payload to every port. If an ICMP port unreachable error (type 3, code 3) is returned, the port is closed."
Check first nmap works this way.
Last edited by Scott; 05-21-2013 at 09:41 AM..
Reason: Use code tags, please...
So who uses antivirus software on your linux servers? A co-worker and myself have been debating on the need or lack there of for antivirus on a linux webserver running Apache even if that's the only service that may be running. He thinks no and I am of the opinion that it is needed. My rational... (1 Reply)
At the company where I work, use a product called VSI-FAX. It works nicely, but the maintenance has proven to be very poor grade. So, I'm interested in any experiences using other fax servers that run on Linux or AIX and what issues/gotchas were run into and overcome and how.
I'm considering... (0 Replies)
1.On x86 Machines ( Pentium4 ), What is the maximum number of Services( sshd, ntpd,named ,samba, etc.) that can be installed.? Is there a rule of thumb to attain the best possible performence.?
2. Is there a systematic way to boot a remote Machine.?
3. Are there any problems of having two... (2 Replies)
Hi
Is there any shell script that accesses multiple linux servers to get details such as CPU usage, RAM used etc. The access of the servers must be parallel not serial in the sense it must ping all the servers at a time to get information.The script has to be triggered from a host system and get... (7 Replies)
I've created a test script, which is located in $HOME/bin. The script runs as expected with no issues. However, upon echo'ing the $path variable the location of my script is not located in any of the directories listed in $path. So my question is, how does shell know where the script is located... (2 Replies)
Discussion started by: BrandonD
2 Replies
LEARN ABOUT CENTOS
ipsec_ikeping
IPSEC_IKEPING(8) Executable programs IPSEC_IKEPING(8)NAME
ipsec_ikeping - send/receive ISAKMP/IKE echo requests/replies
SYNOPSIS
ipsec ikeping [--listen] [--verbose] [--wait time] [--exchangenum num] [--ikeport localport] [--ikeaddress address] [--inet] [--inet6]
destaddr [/dstport...]
DESCRIPTION
Ikeping sends and receives ISAKMP/IKE echo request and echo reply packets. These packets are intended for diagnostics purposes, in a manner
similar to ping(8) does for ICMP echo request/reply packets.
At the time of this writing, the ISAKMP echo request/reply exchange is still an internet-draft (draft-richardson-ipsec-ikeping-00), and is
therefore completely non-standard. The Libreswan IKE daemon pluto does implement this draft, so ikeping can be used to test connectivity to
an libreswan ipsec server.
Ikeping will bind to the local address given by --ikeaddress and the port number given by --ikeport defaulting to the wildcard address and
the ISAKMP port 500. An ISAKMP exchange of type 244 (a private use number) is sent to each of the address/ports listed on the command line.
The exchange number may be overridden by the --exchangenum option.
Ikeping then listens for replies, printing them as they are received. Replies are of exchange type 245 or the specified exchange number
plus 1. Ikeping will keep listening until it either receives as many echo responses as it sent, or until the timeout period (5 seconds)
has been reached. Receipt of a packet will reset the timer. The --wait option can be used to specify a different timeout period.
If the --listen option is given, then ikeping will not send any packets. Instead, it will listen for them and reply to each request
received.
If the --natt option is given, then ikeping will set the socket to permit UDP encapsulated ESP packets. This is only useful in listen mode.
FILES
no external files
SEE ALSO ping(8), ipsec_pluto(8)HISTORY
Written for the Linux FreeS/WAN project <http://www.freeswan.org> by Michael Richardson.
AUTHOR
Paul Wouters
placeholder to suppress warning
libreswan 12/16/2012 IPSEC_IKEPING(8)