41 lines
1.0 KiB
Plaintext
41 lines
1.0 KiB
Plaintext
########
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*filter
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########
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:INPUT ACCEPT [0:0]
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:FORWARD DROP [0:0]
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:OUTPUT ACCEPT [0:0]
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# Remove all rules from all chains,
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# delete all user-defined chains.
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-F
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-X
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# Allow all loopback (lo) traffic and reject anything
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# to localhost that does not originate from lo.
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-A INPUT -i lo -j ACCEPT
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-A INPUT ! -i lo -s 127.0.0.0/8 -j REJECT
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-A OUTPUT -o lo -j ACCEPT
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# Allow all outgoing traffic.
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-A OUTPUT -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
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-A INPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
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# Allow incoming ICMP ping.
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-A INPUT -p icmp --icmp-type echo-request -j ACCEPT
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-A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT
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# Allow outgoing ICMP ping.
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-A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT
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-A INPUT -p icmp --icmp-type echo-reply -j ACCEPT
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# Deny other ICMP.
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-A INPUT -p icmp -j DROP
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-A OUTPUT -p icmp -j DROP
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# Allow incoming SSH.
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-A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
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-A OUTPUT -p tcp --sport 22 -m conntrack --ctstate ESTABLISHED -j ACCEPT
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COMMIT
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