how to open a port - Printable Version

how to open a port - Printable Version

+- Linux-Noob Forums (https://www.linux-noob.com/forums)
+-- Forum: Linux Server Administration (https://www.linux-noob.com/forums/forum-8.html)
+--- Forum: Security and Firewalls (https://www.linux-noob.com/forums/forum-87.html)
+--- Thread: how to open a port (/thread-3636.html)

how to open a port - anyweb - 2004-02-10

via lokkit, in the 'Other Ports' field, type:

https:tcp

then apply the changes. or if you want to do this in the console,

type:-

Code:
iptables -A INPUT -i eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT

iptables -L will list your current rules

the above example opens port 443

cheers

anyweb

how to open a port - raky - 2007-08-28

does this mean port 67 is open?

output from iptables -L:

ACCEPT udp -- anywhere anywhere udp spt:bootps state ESTABLISHED

how to open a port - xDamox - 2007-08-28

Quote:iptables -A INPUT -i eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT

Code:
iptables -A INPUT

This sets the IP rule to be appended into the INPUT table

Code:
-i eth0

This rule applys on the eth0 interface

Code:
-p tcp --sport 443

This sets the protocol to TCP and the source port is 443

Code:
-m state --state ESTABLISHED -j ACCEPT

This sets a match on the state of established that means if the connection has been established it will be accepted.

However this rule will deny any new connections as the rule needs the state of NEW

Code:
iptables -A INPUT -i eth0 -p tcp --sport 443 -m state --state NEW,ESTABLISHED -j ACCEPT

how to open a port - znx - 2007-08-28

Quote:ACCEPT udp -- anywhere anywhere udp spt:bootps state ESTABLISHED

This says, accept UDP, from any host, to any host FROM the source port (spt) of bootps with the an established state.

So, no your port isn't "open". Instead, only when your system has a connection already active, will it accept access from port 67 on the remote host.