iptables domain name instead of ip
iptables allow all from ipiptables drop all
iptables -- to destination hostname

11 Jul 2017 Using IPTables edit rules with Dynamic IP hostnames like dyndns.org return text home_dyndns = "example.dyndns.org" log_dyndns = ". 16 Jan 2015 (You can get away with specifying a host name for a simple IP, but not, it seems, The IPTables manual also recommends against specifying a If you use hostnames and you do not control the DNS, then someone else effectively controls your IPtables rules. Mistakes, errors or security 8 Sep 2017 Do not paste the IPTables configuration below blindly to your system. Do not DNS lookups, you should consider using a different DNS server. 26 May 2010 Whenever IPTables has a hostname in a rule it looks up the hostname's IP address and uses that instead of the actual hostname - so it's stuck with Cur: example.dyndns.org has address 114.76.37.112 IPs match, no restartHi, ive setup a few simple rules though iptables. but, ive allowed connections to smtp.ntlworld.com through port 25 BUT, if i try to telnet to 23 Jul 2018 Use iptables to manage Netfilter rules. For example, the following command adds a rule to the beginning of the chain that will drop all packets from the -s, --source, Can be an address, network name, hostname, etc. When you modify rules, iptables resolves hostnames to ip's, and when you list rules iptables perform a reverse lookup of the ip's (unless you use the -n else, you have a pretty strange setup and are probably in for surprises. If you use hostnames and you do not control the DNS, then someone else effectively controls your IPtables rules. Mistakes, errors or security -A INPUT -p tcp -m tcp -m multiport -s example.dyndns.com -i eth0 --ports 22 -j There are no iptables rules with hostnames, only IP's.