07-13-2009, 09:50 PM
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Junior Member
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Join Date: Jul 2009
Posts: 9
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Here are some more steps that I take. (Borrowed from SliceHost: http://articles.slicehost.com/2008/4...y-setup-page-1)
Change the default SSH port:
Code:
sudo nano /etc/ssh/sshd_config
Port 30000
Setting up IPTABLES:
Code:
sudo iptables-save > /etc/iptables.up.rules
sudo nano /etc/iptables.test.rules
Example IPTABLES:
Code:
*filter
# Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT -i ! lo -d 127.0.0.0/8 -j DROP
# Accepts all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# Allows all outbound traffic
# You can modify this to only allow certain traffic
-A OUTPUT -j ACCEPT
# Allows HTTP and HTTPS connections from anywhere (the normal ports for websites)
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT
# Allows SSH connections
#
# THE -dport NUMBER IS THE SAME ONE YOU SET UP IN THE SSHD_CONFIG FILE
#
-A INPUT -p tcp -m state --state NEW --dport 30000 -j ACCEPT
# Drop ping
-A INPUT -p icmp -m icmp --icmp-type 8 -j DROP
# log iptables denied calls
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7
# Reject all other inbound - default deny unless explicitly allowed policy
-A INPUT -j REJECT
-A FORWARD -j REJECT
COMMIT
Implement the changes:
Code:
sudo iptables-restore < /etc/iptables.test.rules
Check the changes:
Save the changes:
Code:
sudo iptables-save > /etc/iptables.up.rules
Set them to reset during reboots:
Code:
sudo nano /etc/network/interfaces
...
auto lo
iface lo inet loopback
pre-up iptables-restore < /etc/iptables.up.rules
# The primary network interface
...
reload:
Code:
sudo /etc/init.d/ssh reload
Last edited by indytechcook; 07-15-2009 at 02:56 PM.
Reason: Changed iptaables file to DROP
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