How can I on my ubuntu server, in Iptables only allow one IP adress on a specific port?
Thanks
How can I on my ubuntu server, in Iptables only allow one IP adress on a specific port?
Thanks
One liner:
iptables -I INPUT \! --src 1.2.3.4 -m tcp -p tcp --dport 777 -j DROP # if it's not 1.2.3.4, drop it
A more elegant solution:
iptables -N xxx # create a new chain
iptables -A xxx --src 1.2.3.4 -j ACCEPT # allow 1.2.3.4
iptables -A xxx --src 1.2.3.5 -j ACCEPT # allow 1.2.3.5
iptables -A xxx --src 1.2.3.6 -j ACCEPT # allow 1.2.3.6
iptables -A xxx -j DROP # drop everyone else
iptables -I INPUT -m tcp -p tcp --dport 777 -j xxx # use chain xxx for packets coming to TCP port 777
Here's an example from one of my CentOS systems (addresses have been obfuscated):
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp -s 1.2.3.4 -d 5.6.7.8 --dport 22 -j ACCEPT
I use shorewall to configure IP table. Use a rule like to accept from one host to port 123.
ACCEPT net:192.0.2.1 $FW tcp 1234