firewall vs. closing ports Post: 15047

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/* Linux Slackware */ Nmap shows the following ports open on the gateway. 21/tcp ftp 22/tcp ssh 23/tcp telnet 25/tcp smtp 37/tcp time 80/tcp http 113/tcp auth 515/tcp printer 587/tcp submission 1024/tcp kdm 6000/tcp x11 ------------------------------- i would like to close as...

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Hi all Is there a command that I can use to close out open ports? I did a netstat - a -p and got a long list of ports open (see sample below). I have disabled the some of the applications from /etc/services/. But there are still applications listening on certain ports. I need to know how to...

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i have a text file i.e file1.txt which shows open ports on particular system. i have another text file i.e file2.txt which shows a list of allowed ports on a system. for eg: file2.txt 22/tcp ssh 23/tcp telnet. can i have a script which would compare these text files ,file1 and file2 ...

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I have firewall rules to open ports, why telnet refuses connection?

Alright... this question comes from the fact that I'm trying to setup postfix to relay messages to Office 365 SMTP but its giving me connection refused... I read that if you have doubts if your port is open or not you should telnet to them so thats what I did. This is a Red Hat 6.3 box. My...

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Closing thread

Hi, I guess, users do not have rights to close a thread. Please close thread 'Small automation' as it is resolved. Regards, snjksh

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clockdiff

CLOCKDIFF(8)						 System Manager's Manual: iputils					      CLOCKDIFF(8)

NAME

       clockdiff - measure clock difference between hosts

SYNOPSIS

       clockdiff [-o] [-o1] destination

DESCRIPTION

       clockdiff  Measures  clock difference between us and destination with 1 msec resolution using ICMP TIMESTAMP [2] packets or, optionally, IP
       TIMESTAMP option [3] option added to ICMP ECHO.	[1]

OPTIONS

       -o     Use IP TIMESTAMP with ICMP ECHO instead of ICMP TIMESTAMP messages. It is useful with some destinations, which do not  support  ICMP
	      TIMESTAMP (f.e. Solaris <2.4).

       -o1    Slightly	different  form  of  -o,  namely it uses three-term IP TIMESTAMP with prespecified hop addresses instead of four term one.
	      What flavor works better depends on target host. Particularly, -o is better for Linux.

WARNINGS

       o Some nodes (Cisco) use non-standard timestamps, which is allowed by RFC, but makes timestamps mostly useless.

       o Some nodes generate messed timestamps (Solaris>2.4), when run xntpd. Seems, its IP stack uses a corrupted clock source, which is synchro-
	 nized	to  time-of-day  clock periodically and jumps randomly making timestamps mostly useless. Good news is that you can use NTP in this
	 case, which is even better.

       o clockdiff shows difference in time modulo 24 days.

SEE ALSO

       ping(8), arping(8), tracepath(8).

REFERENCES

       [1] ICMP ECHO, RFC0792, page 14.

       [2] ICMP TIMESTAMP, RFC0792, page 16.

       [3] IP TIMESTAMP option, RFC0791, 3.1, page 16.

AUTHOR

       clockdiff was compiled by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>. It was based on code borrowed from BSD timed daemon.	It  is	now  main-
       tained by YOSHIFUJI Hideaki <yoshfuji@skbuff.net>.

SECURITY

       clockdiff requires CAP_NET_RAWIO capability to be executed. It is safe to be used as set-uid root.

AVAILABILITY

       clockdiff  is  part  of iputils package and the latest versions are  available in source form at http://www.skbuff.net/iputils/iputils-cur-
       rent.tar.bz2.

iputils-101006							   12 April 2011						      CLOCKDIFF(8)