Dear David
Thank you for the brief explain
some of the verbs such as established sound familiar from the days i used to work with
Cisco access lists and checkpoint firewall
the new command wasn't known to me
However if i put accept for new then it will not block anything because every incoming
connection considered new
so if i put accept new i must put after it (or before it) deny UDP 53 in order to
block the DNS queries coming from the internet that part was mising for me
ill go to the links you provided and read them as well although i deal with router
(hardware) firewall and not unix (software) firewall
73's
Ronen - 4Z4ZQ
http://www.ronen.org
________________________________________
themselves "New" would be a new traffic flow coming to your machine and
if it should be accepted or not. "Established" is when an existing flow
that was previously accepted continues to flow back and forth.
On Linux, we use IPTABLES for our L2 and L3 firewall -
https://www.google.com/search?q=iptables+tutorial
FreeBSD uses "pf" -
https://www.freebsd.org/doc/handbook/firewalls-pf.html
This is all detailed networking work and deserves some quality study on
your part to keep your machine secure on the big, *bad* internet. All
fun stuff if you're interested in networking technologies which is
common for folks here on the AMPR list.
--David
KI6ZHD