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Accepted
Brian Webster
Asked: 2011-04-27 15:17:51 +0800 CST

Ubuntu on EC2 - How do I ip-restrict port 22 to a specific IP address?

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I'm lost in Linux, can somebody help me with an iptables command to allow only the IP Address 5.5.5.5 to access port 22?

I've got that port restricted to the same IP in the EC2 security group, but I need to block it on the instance itself as well.

linux ubuntu iptables

3 Answers

  1. Best Answer

    Aren't you being a little excessive? Your instances on EC2 are nicely isolated from other traffic by their own private firewall on the virtual network device you are "plugged into" upstream.

    iptables -A INPUT -p tcp -s 5.5.5.5/32 --destination-port 22 -j ACCEPT
iptables -A INPUT -p tcp --destination-port 22 -j REJECT
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  2. Try:

    iptables -I INPUT 1 -p tcp --dport 22 -s 5.5.5.5 -j ACCEPT
iptables -I INPUT 2 -p tcp --dport 22 -j REJECT

    This adds a rule which specifically allows access from that IP, then a rule which specifically denies it from everyone else.

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