Hello. I am using RedHat 7.1 (kernel 2.4.13-ac5). I am trying to set up ssh (having sshd up). When someone scans me via nmap, it says that port 22 is filtered. I know i don't have iptables or ipchains set up. I was also told that RedHat has a default firewall setting that filters ports. How can I fix this? Thank you.