Comments on: Firewall Ubuntu Servers

By: ctlarsen

ctlarsen — Thu, 07 Jan 2010 03:22:32 +0000

This article was *very* helpful to me at a crucial time. Thank you for your efforts, especially the examples and attention to detail, all written with CLARITY (a difficult commodity to find in Linux work).

Well done!

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By: bodhi.zazen

bodhi.zazen — Thu, 26 Nov 2009 14:43:29 +0000

LOL, this is true and I have had that problem.

As with all things, as you use ufw and become more familiar with it you will become more familiar with the syntax.

As you suggest, the syntax of ufw (when listing the rules) is cryptic, but is often sufficient to work through, but it can be difficult.

If you are stuck you could consider either deleting the rule with gufw or post on the Ubuntu Forums, in the security section (ask for help).

By: memilanuk

memilanuk — Thu, 26 Nov 2009 06:37:56 +0000

Hmmm… my main question is if you enter a semi-complicated (for the sort of person ufw is designed for) rule, say one specifying only allowing a certain machine access to a certain port, over tcp, that sort of thing… how do you specify that rule later if you want to delete it? ufw only lists the rules, not the syntax that created them. On the one hand it should give an experienced user enough information that they could recreate the rule and successfully delete it, but for a beginner who didn’t copy it down in a text file somewhere… they might left with no option but to wipe all the rules to get the one they really wanted gone.

Or am I missing something here?

By: Jemicomiutt

Jemicomiutt — Wed, 25 Nov 2009 18:56:51 +0000

Lots of of folks write about this topic but you said really true words.

By: Bodhi.Zazen: Firewall Ubuntu GUFW | L&C Tech Talk

Bodhi.Zazen: Firewall Ubuntu GUFW | L&C Tech Talk — Wed, 25 Nov 2009 02:27:23 +0000

[...] Firewall Ubuntu Desktops Firewall Ubuntu Servers [...]

By: bodhi.zazen

bodhi.zazen — Tue, 24 Nov 2009 16:06:56 +0000

This is indeed very handy drubin.

You may search for a service with grep :

grep ssh /etc/services ssh 22/tcp # SSH Remote Login Protocol ssh 22/udp

By: drubin

drubin — Tue, 24 Nov 2009 08:01:45 +0000

Very nice article thanks bodhi!

You can also look in /etc/services for the ports/protocol info. Very handy if you only have ssh access and well can’t go browsing wiki pages.

By: uberVU - social comments

uberVU - social comments — Tue, 24 Nov 2009 04:46:55 +0000

Social comments and analytics for this post…

This post was mentioned on Twitter by planetubuntu: Bodhi.Zazen: Firewall Ubuntu Servers: This post is in follow up to my post on firewalls on Ubuntu Desktops.
IMO fir… http://bit.ly/6LjTGM...

By: bodhi.zazen

bodhi.zazen — Tue, 24 Nov 2009 01:46:27 +0000

OK, thanks for the feedback. I personally prefer to keep ping so I overlooked this detail, I will update my post.

— Should be better now =)