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linux - iptables - use service name or port number, IP-address or . . . Using service names with iptables: Although safe this also seems to generate some confusion The file etc services is used to translate the service name to port number when instead of a port number a human readable "service name" is used with iptables --protocol tcp --source-port (or the alias --sport and the similar --destination-port --dport ect ) The service name is effectively a human
What is the difference between Port Forwarding and NAT Forwarding? I dont know for sure but it would appear to me that port forwarding is what you would expect (ie external connection to internal servers), NAT forwarding almost seems like some attempt to handle hairpin nat or intercept traffic destined from lan to Internet and redirect to a local server
linux - How can I port forward with iptables? - Server Fault I want connections coming in on ppp0 on port 8001 to be routed to 192 168 1 200 on eth0 on port 8080 I've got these two rules -A PREROUTING -p tcp -m tcp --dport 8001 -j DNAT --to-destination 1
Is -m conntrack --ctstate NEW,ESTABLISHED necessary? I have this rule and it allows connection on three ports: iptables -A INPUT -p tcp -m multiport --dports 22,80,443 -j ACCEPT Then on internet I see examples including -m conntrack --ctstate NEW,
What is the correct way to open a range of ports in iptables What you've been told is right, although you've written it wrong (you've forgotten --dport) iptables -A INPUT -p tcp --dport 1000:2000 will open up inbound traffic to TCP ports 1000 to 2000 inclusive -m multiport --dports is only needed if the range you want to open is not continuous, eg -m multiport --dports 80,443, which will open up HTTP and HTTPS only - not the ones in between Note that
linux - iptables error: unknown option --dport - Server Fault 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
linux - Iptables: -p udp --state ESTABLISHED - Server Fault 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
Drop ALL the TCP connections (ESTABLISHED,RELATED) in Ubuntu Also mind the spaces between parenthesis): ss --kill -tn 'dst == 192 0 2 2 and ( sport == 80 or sport == 443 )' (or just the destination, it's about an attacker anyway) Unlike tcpkill this doesn't involve sending custom packets anywhere, it's directly done to the socket using a kernel API