Hi,
So that potential responders will have an idea of what they're dealing with let me say that while I am a UNIX newbie I have been in IT for over 10 years.
We have several SUN boxes running ver 5 of the OS that have been sitting dormant for some time as they were part of a now defunct... (3 Replies)
Hi,
I will like to allow access to the mysql port (3306) to certain IP address. All other IP's should be automatically blocked. What is the best way to do this? (8 Replies)
I am trying to block ALL traffic except when from ports 9100,22,23 to destination network 192.0.0.0 (my WAN): 2 networks 192.0.3.0 with static route to 192.0.0.0
Shouldn't this work?:
iptables -A INPUT -p tcp -d 192.0.0.0/24 --dport 22 -j ACCEPT
iptables -A INPUT -p tcp -d 192.0.0.0/24... (3 Replies)
i want to kill a tcp connection by killing its pid
with netstat -an i got the tcp ip connection on port 5914
but when i type ps -a or ps-e there is not such process running on port 5914
is it possible that because i do not log on with proper user account i can not see that process running? (30 Replies)
Hi All,
I successfully configured a DEBIAN Lenny bridged firewall
using ebtables.
The bridged interface is br0.
The ethernet interface are eth0 & eth1 respectively.
All the traffic are transparently passing my firewall but i need to find & block temporarily the bandwidth abusers.
Can... (1 Reply)
hi guys
I doing some collocation for a customer, customer requested to use other port for ssh not the default one. OK no problem
and customer will be using rsync to sync backups among other things
I know we have to open port let's say port 5999 for ssh since we are using that one now but I... (1 Reply)
Hi Experts,
I am receiving below error while trying to connect port 8080.
Could not open connection to the host, on port 8080 : connection refused.
iptables configuration
/etc/sysconfig/iptables
# Firewall configuration written by system-config-firewall
# Manual customization of... (1 Reply)
If I would like to know what connection , data , traffic in a network port ( eth0 ) , what can I do ?
ps. because I always found the network is very slow , so I would like what the network port is doing .
Thanks
Login ID ust3 is currently in read-only mode for multiple infractions. Creating... (0 Replies)
Hi Friends,
How to do port forwarding in AIX? We would like to re route traffic from port A to port B on AIX LPAR.
for example: my application is using 8080 port on LPAR and would like to use the 8081 instead of 8080. By default application was configured with 8080. But instead of changing... (2 Replies)
Discussion started by: System Admin 77
2 Replies
LEARN ABOUT CENTOS
firewalld.zones
FIREWALLD.ZONES(5) firewalld.zones FIREWALLD.ZONES(5)NAME
firewalld.zones - firewalld zones
DESCRIPTION
What is a zone?
A network zone defines the level of trust for network connections. This is a one to many relation, which means that a connection can only
be part of one zone, but a zone can be used for many network connections.
The zone defines the firewall features that are enabled in this zone:
Predefined services
A service is a combination of port and/or protocol entries. Optionally netfilter helper modules can be added and also a IPv4 and IPv6
destination address.
Ports and protocols
Definition of tcp or udp ports, where ports can be a single port or a port range.
ICMP blocks
Blocks selected Internet Control Message Protocol (ICMP) messages. These messages are either information requests or created as a reply
to information requests or in error conditions.
Masquerading
The addresses of a private network are mapped to and hidden behind a public IP address. This is a form of address translation.
Forward ports
A forward port is either mapped to the same port on another host or to another port on the same host or to another port on another
host.
Rich language rules
The rich language extends the elements (service, port, icmp-block, masquerade and forward-port) with additional source and destination
addresses, logging, actions and limits for logs and actions. It can also be used for host or network white and black listing (for more
information, please have a look at firewalld.richlanguage(5)).
For more information on the zone file format, please have a look at firewalld.zone(5).
Which zones are available?
Here are the zones provided by firewalld sorted according to the default trust level of the zones from untrusted to trusted:
drop
Any incoming network packets are dropped, there is no reply. Only outgoing network connections are possible.
block
Any incoming network connections are rejected with an icmp-host-prohibited message for IPv4 and icmp6-adm-prohibited for IPv6. Only
network connections initiated within this system are possible.
public
For use in public areas. You do not trust the other computers on networks to not harm your computer. Only selected incoming connections
are accepted.
external
For use on external networks with masquerading enabled especially for routers. You do not trust the other computers on networks to not
harm your computer. Only selected incoming connections are accepted.
dmz
For computers in your demilitarized zone that are publicly-accessible with limited access to your internal network. Only selected
incoming connections are accepted.
work
For use in work areas. You mostly trust the other computers on networks to not harm your computer. Only selected incoming connections
are accepted.
home
For use in home areas. You mostly trust the other computers on networks to not harm your computer. Only selected incoming connections
are accepted.
internal
For use on internal networks. You mostly trust the other computers on the networks to not harm your computer. Only selected incoming
connections are accepted.
trusted
All network connections are accepted.
Which zone should be used?
A public WIFI network connection for example should be mainly untrusted, a wired home network connection should be fairly trusted. Select
the zone that best matches the network you are using.
How to configure or add zones?
To configure or add zones you can either use one of the firewalld interfaces to handle and change the configuration: These are the
graphical configuration tool firewall-config, the command line tool firewall-cmd or the D-BUS interface. Or you can create or copy a zone
file in one of the configuration directories. /usr/lib/firewalld/zones is used for default and fallback configurations and
/etc/firewalld/zones is used for user created and customized configuration files.
How to set or change a zone for a connection?
The zone is stored into the ifcfg of the connection with ZONE=option. If the option is missing or empty, the default zone set in firewalld
is used.
If the connection is controlled by NetworkManager, you can also use nm-connection-editor to change the zone.
SEE ALSO firewall-applet(1), firewalld(1), firewall-cmd(1), firewall-config(1), firewalld.conf(5), firewalld.direct(5), firewalld.icmptype(5),
firewalld.lockdown-whitelist(5), firewall-offline-cmd(1), firewalld.richlanguage(5), firewalld.service(5), firewalld.zone(5),
firewalld.zones(5)NOTES
firewalld home page at fedorahosted.org:
http://fedorahosted.org/firewalld/
More documentation with examples:
http://fedoraproject.org/wiki/FirewallD
AUTHORS
Thomas Woerner <twoerner@redhat.com>
Developer
Jiri Popelka <jpopelka@redhat.com>
Developer
firewalld 0.3.9 FIREWALLD.ZONES(5)