Interested to Buy Any Domain ? << Click Here >> for more details...
How to check all open ports on linux machine and block
unsed ports????????
- 7 Answers
- 32091 Views
- Tech Mahindra, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / sureshreddy
#netstat -tulp
or
#netstat -tulpn
to verfy the open ports
| Is This Answer Correct ? | 17 Yes | 1 No |
Answer / parthasarathy k
#nmap -v localhost for tcp
#nmap -sU localhost for udp
| Is This Answer Correct ? | 12 Yes | 6 No |
Answer / manoj
netstat -t(tcp)
netstat -u(udp)or
netstat -tulpn
to verfy the open ports
to block u have to use iptable & tcp_wrappers( hosts.deny
file)
| Is This Answer Correct ? | 6 Yes | 1 No |
Answer / pankaj pal
To check all the Open Ports use command
netstat - tulpn
To Block Ports for eg.22 and 80 as requested by Ashish
iptables -t filter -A INPUT -s!192.168.0.0/24(IP which you
want to allow) -p tcp -d (destination server IP) --dport
22 -j DROP
iptables -t filter -A INPUT -s!192.168.0.0/24(IP which you
want to allow) -p tcp -d (destination server IP) --dport
80 -j DROP
| Is This Answer Correct ? | 5 Yes | 0 No |
Answer / ashish
Hi!! All
Can you give an example to block certain ports
like block 22 & 80.
Any help will be appreciated.
Ashish
| Is This Answer Correct ? | 2 Yes | 1 No |
why you are using nis server
commands regarding the adding of users into groups n different options with useradd...?
Give a Linux shell command to find all files in a directory which contain ip addresses.
My root password has been changed, how can i enter into the system without root password?
there are many IPC mechanisms available in Linux ? Which one is best to use and when ?
will u plz send me the complete steps of installation of red hat linux on intel's core 2 duo processor?
As a system admin i want to know some things what are the troubleshooting issues we are facing frequently and what are the tickets will be raised.
What is the other method of installing Linux O.S other than Text, GUI mode? Why we prefer that for installation of Linux in Real time?
How to trace any process background processing?
How To Hide the FTP Version?
what are the default permissions for files and folders..?
How to catagories tickets in RHEL, which tickets are belong to PROBLEM, INCIDENT and CHANGE management? please given to me with examples
Linux Commands 
