Hi Guys, whoever is having issue with iptables installation and configuration task, please try this approach.I have had success with it.I am new to linux and I thought to share with the community. Anyway, this approach has worked for me.
1)install iptables in all three apps( stapp01, stapp02, stapp03)
sudo yum install –y iptables-services
systemctl enable iptables
systemctl enable ip6tables
systemctl start iptables
systemctl start ip6tables
sudo iptables -A INPUT -p tcp --destination-port (in question) -s 172.16.238.14 -j ACCEPT
sudo iptables -A INPUT -p tcp --destination-port (in question) -j DROP
@nidhincn Hi, can we just do the accept command part as it will ultimately reject for other incoming connections on the port specified?
Why did you do the DROP part please let me know , im bit confused.
Sorry for getting back to you late.The question specifically asks for blocking the port in question, so I have explicitly used the DROP command here.As, i mentioned already, I am new to Linux and still learning the things.However, this approach has worked for me.Thanks.
@nidhincn@akshayyw…I followed the above steps as it is on all app servers. But when i tried to curl/telnet from load balancer server its not connecting…plz suggest.
Hi @pratikshag,
Did you check your iptable rules are same in all app servers?Also, did you validate the curl command from load balancer to all other app servers, such as stapp02 and stapp03 ?
Regards
Nidhin