When you trying for work with computers first you see KB (or KiloBytes)and MB (or MegaBytes) all the time but where you does it stand for?Basically it’s a measurement of memory on a computer.
Here i have some examples of what some other numbers and letters look like to the computer:
Code:
0 = 00000000 a = 01100001 L = 01001100
1 = 00000001 v = 01110110 p = 01110000
2 = 00000010 $ = 00100100 z = 01111010
Link deleted.
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Last edited by Don Cragun; 10-21-2013 at 08:28 AM..
Reason: Spam.
Hi Guys,
I was just wondering if anybody can help me with this problem.
OK, how we can get a value back from PL/SQL Script (not stored procedure/function)
See the below example: (for example aaa.sh)
#!/bin/ksh
VALUE=`sqlplus -s user/password@test_id <<EOF
@xxx.sq
EOF`
echo $VALUE
... (7 Replies)
hi all,
Can any 1 help me translate this korn shell code to C shell code :
email=$(grep "^$1" $folder/config_2.txt | awk '{print $2'})
In config_2.txt the content is :
which mean in korn shell , $1=groupname and $2=email address.
Now i need to write in C shell script,when i set the... (2 Replies)
Hi,
I want to remove the following code from Source files (or replace the code with empty.) from all the source files in given directory.
finally {
if (null != hibernateSession && hibernateSession.isOpen()) {
//hibernateSession.close();
}
}
It would be great if the script has... (2 Replies)
Hi ,
I have a code where i am using a infinite while loop . some thing like below
while
do
if
then
#go to line 20
fi
command 1;
command 2;
#line 20:
sleep 34; (5 Replies)
Discussion started by: Paarth
5 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)
10-07-2013
