I have to admit that I am not the best to advise on iptables but I
believe I can answer your questions.
Try using
#iptables -A INPUT -p tcp -s PUT_IP_HERE -d 0/0 --syn -j LOG
#iptables -A INPUT -p tcp -s PUT_IP_HERE -d 0/0 --syn -j DROP
For additional security I would restrict the interface that you expect
traffic to come in on as well. For example;
#iptables -A INPUT -i eth2 -s ip_address -d 0/0 -p tcp --syn -j DROP
If you want line numbers then try;
#iptables -L -v --line-numbers
With regards to blocking access to ssh and allowing from only a
specified ip, if would do the following
1) #iptables -P INPUT DROP
2) #iptables -A INPUT -i eth2 -s example_ip -d ip_of_server -p tcp -m
tcp --dport ssh -m state --state NEW,ESTABLISHED -j ACCEPT
Step one sets the default policy for the INPUT table, thus dropping all
incoming traffic. Step two allows ssh access from the specified ip only
if it is coming in via interface eth2.
Hope this is what you wanted.
Toby
Meatplow wrote:
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Hello.
I'm running RH Enterprise edition.
I'm relatively new to iptables. I am getting the common intrusion
attempts with some of the common uses of test/guest/root/ and a
couple others I've been able to add the IPs to the to iptables.,
but
I'd really like a log that tells me the info that I want to know.
My basic input command is this :
#iptables -A INPUT -p tcp -s PUT_IP_HERE -d 0/0 --syn -j DROP
iptables seem a little convoluted. Example. To delete a line -
supposedly give it a line and it will be deleted/modified. My
problem is even with #iptable -L -v there is no line number ?
My goal is to block all incoming ssh attempts except IP#.
This is where I got into hosts.allow/deny as mentioned below.
I've tried to find many different types of commands and it works to
some degree, but not the way I'd expect it to.
Any help would be appreciated. I'm not completely sure that I
understand iptables as well as I want/need to. I've also toyed
around with the hosts.allow/hosts.deny and have not been successful.
I know that there is a lot of info in here, and I'm tired. I'll
leave it at that
Thanks in advance for your time and help.
Meatplow
greg ta meatplow.com
Thanks again.
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