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Top Forums UNIX for Dummies Questions & Answers Ubuntu 9.10 FIrewall--is UFW allowing anything through by default? Post 302407497 by RTM on Thursday 25th of March 2010 02:53:43 PM
Old 03-25-2010
By default, no, it's not going to let anything through.

To let ssh and http, you could set the following (change to your needs)

root@# ufw limit ssh/tcp
Rules updated
root# ufw allow proto tcp from 192.168.0.0/16 to any port 80
Rule added
root# ufw status
Status: active

To Action From
-- ------ ----
22/tcp LIMIT Anywhere
80/tcp ALLOW 192.168.0.0/16

The man page for ufw shows probably everything you would need to know.
 

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tcp-env(1)                                                    General Commands Manual                                                   tcp-env(1)

NAME
tcp-env - set up TCP-related environment variables SYNOPSIS
tcp-env [ -rR ] [ -ttimeout ] program [ arg ... ] DESCRIPTION
The input for tcp-env must be a TCP connection. tcp-env finds out information about that connection, puts the information into several environment variables as described in tcp-environ(5), and runs program with the given arguments. Usually tcp-env is run from inetd. It might instead be run from another server that already sets up the right environment variables; if PROTO is set to TCP when tcp-env is invoked, tcp-env assumes that all the other variables are set up properly, and it does not check whether the input is a TCP connection. OPTIONS
-r (Default.) Attempt to obtain TCPREMOTEINFO from the remote host. -R Do not attempt to obtain TCPREMOTEINFO from the remote host. -ttimeout Give up on the TCPREMOTEINFO connection attempt after timeout seconds. Default: 30. SEE ALSO
tcp-environ(5), inetd(8) tcp-env(1)
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