Try highlighting the text in these.
<code>
block:
*filter # This will allow all loopback (lo0) traffic and drop all traffic to 127/8 # that does not use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # This accepts all already established connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # This allows all outbound traffic -A OUTPUT -j ACCEPT
<code text>
block:
*filter # This will allow all loopback (lo0) traffic and drop all traffic to 127/8 # that does not use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # This accepts all already established connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # This allows all outbound traffic -A OUTPUT -j ACCEPT
Notice the extra spaces that the text formatting option puts in the blank lines. Not helpful in the case of iptables rules files, where these spaces break the parser…
Works ok if you don't specify the format (use - ), e.g.
*filter # This will allow all loopback (lo0) traffic and drop all traffic to 127/8 # that does not use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # This accepts all already established connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # This allows all outbound traffic -A OUTPUT -j ACCEPT