Block an IP address from connecting to a server

iptables -A INPUT -s -j DROP
This appends (-A) a new rule to the INPUT chain, which specifies to drop all packets from a source (-s) IP address.

By: root
2009-02-02 12:42:04

These Might Interest You

What Others Think

exactly what I needed to get ridd of several IP addresses.
kille · 485 weeks and 5 days ago
I usually use "-I INPUT" rather than "-A INPUT" to ensure it's not allowed by something else first. Also is the /32 required?
pixelbeat · 485 weeks and 2 days ago
I'd really like to shut this off now that I've tested it. How might I go about that?
Tralce · 480 weeks and 1 day ago
Check first. iptables -vn -L INPUT Add rule. iptables -A INPUT -s -j DROP Check that it's there. Remove rule. iptables -D INPUT -s -j DROP And then check again that it's gone.
AJxn · 344 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: