?
Solved

Simple question: closing ports

Posted on 2001-08-11
6
Medium Priority
?
346 Views
Last Modified: 2010-03-18
I want to close off some ports on my machine and I was told to use iptables (I have kernel 2.4.3). I can't figure out how to do it from the man page. What command would I issue to say close off port 111?
0
Comment
Question by:deck16
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 51

Accepted Solution

by:
ahoffmann earned 300 total points
ID: 6377085
iptables -A FORWARD -d <your-IP> --dport 111 -j DROP
iptables -A INPUT   -d localhost --dport 111 -j DROP

# you need to have packetfiltering enabled in the kernel
0
 
LVL 1

Expert Comment

by:zxcvzxcv
ID: 6377902
you put a place to put my IP. I don't have a static IP. What do I put there? (localhost?)
0
 

Author Comment

by:deck16
ID: 6377910
rrr, I hate the auto-login (sorry for posting with a different account I'm at by brother's house (zxcvzxcv) not used to having to logout and then back in :-)
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 
LVL 7

Expert Comment

by:HalldorG
ID: 6378010
What about

ADDR=$(/sbin/ifconfig ppp0 | grep addr | cut -d':' -f 2 | cut -d' ' -f 1)

There the address is set as it IP number of your machine
and later refer to the IP address as $ADDR

Like


iptables -A FORWARD -d $ADDR/32 --dport 111 -j DROP




0
 

Author Comment

by:deck16
ID: 6378415
why $ADDR/32 in the iptables argument?
0
 
LVL 7

Expert Comment

by:HalldorG
ID: 6381665
that is the mask for the address 32 bits = 255.255.255.255
0

Featured Post

Application Discovery Service in AWS

In the era of the cloud, customers migrating away from their existing on-premise infrastructure. This requires lots of planning, strategies, and effort to identify their existing resources and determine how best to migrate.  Datacenter migrations happen in four phases -

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I have seen several blogs and forum entries elsewhere state that because NTFS volumes do not support linux ownership or permissions, they cannot be used for anonymous ftp upload through the vsftpd program.   IT can be done and here's how to get i…
Note: for this to work properly you need to use a Cross-Over network cable. 1. Connect both servers S1 and S2 on the second network slots respectively. Note that you can use the 1st slots but usually these would be occupied by the Service Provide…
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question