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let's look at these two iptables rules which are often used to allow outgoing DNS: iptables -A OUTPUT -p udp --sport 1024:65535 --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A
First give a -p option like -p tcp or -p udp. Examples: iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j DROP iptables -A INPUT -p udp --dport 53 --sport 1024:65535 -j ACCEPT You could also try -p all but I've never done that and don't find too much support for it in the examples.
At first glance you're only allowing DNS responses to be received and don't create any DNS related rules in the OUTPUT chain to actually allow sending DNS queries out. You current rules: #DNS resolution input and output iptables -A INPUT -p udp --dport 53 -d 8.8.8.8,8.8.4.4 -j ACCEPT ^^^^^ iptables -A INPUT -p udp --sport 53 -s 8.8.8.8,8.8.4.4 -j ACCEPT ^^^^^ Additionally, DNS can also use TCP ...
This can't be fixed with a stateless firewall without voiding the security the firewall is supposed to provide. One can't just add: udp sport 53 accept + tcp sport { 53, 443 } accept to allow DNS replies and HTTPS replies to work, because then any remote attack can use such source ports to access any ports and thus services on the VPS system.
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Explore Terrain's nature-inspired home + garden essentials. About our Locations Each one of our stores is a unique space devoted to nature that is curated for the garden and home — one that engages all the senses for a wholly immersive experience. Each store is a singular expression of its past history, local materials, and our own vibrant story. Inside each of our locations you'll find ...