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Full Discussion: Blocking an IP address
Operating Systems Linux Red Hat Blocking an IP address Post 302498871 by Lazydog on Tuesday 22nd of February 2011 05:38:27 PM
Old 02-22-2011
Quote:
Originally Posted by fpmurphy
If you have iptables configured and running:
Code:
iptables -I INPUT -s <IP_ADDRESS_TO_BLOCK> -j DROP
service iptables reload

Sorry but this is not going to work as you have stated here. Once you have given the first line there is no reason to execute the second as it will only reload the saved rules and thus remove the rule you just added. The command to save the running rules is:

Code:
service iptables save

You need to save the running rules first so that you will have them when you reboot.
 

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XRemoveHosts()															    XRemoveHosts()

Name
  XRemoveHosts - remove multiple hosts from the access control list.

Synopsis
  XRemoveHosts(display, hosts, num_hosts)
	Display *display;
	XHostAddress *hosts;
	int num_hosts;

Arguments
  display   Specifies a connection to an X server; returned from XOpenDisplay().

  hosts     Specifies the list of hosts that are to be removed.

  num_hosts Specifies the number of hosts that are to be removed.

Description
  XRemoveHosts()  removes  each  specified host from the access control list of the connected server.  The server must be on the same host as
  the process that call XRemoveHosts(), in order to change the access control list.

  If you remove your machine from the access control list, you can no longer connect to that server, and there is no way back from this  call
  except to log out, edit the access control file, and reset the server.

  The address data must be a valid address for the type of network in which the server operates, as specified in the family member.

  For  TCP/IP,	the address should be in network byte order.  For the DECnet family, the server performs no automatic swapping on the address
  bytes.  A Phase IV address is two bytes long.  The first byte contains the least significant eight bits of the  node	number.   The  second
  byte contains the most significant two bits of the node number in the least significant two bits of the byte, and the area in the most sig-
  nificant six bits of the byte.

  For more information on access control lists, see Volume One, Chapter 15, Other Programming Techniques.

Structures
     typedef struct {
	 int family;	    /* for example Family Internet */
	 int length;	    /* length of address, in bytes */
	 char *address;     /* pointer to where to find the bytes */
     } XHostAddress;

     /* constants used for family member of XHostAddress */
     #define FamilyInternet	 0
     #define FamilyDECnet	 1
     #define FamilyChaos	 2

Errors
  BadAccess
  BadValue

See Also
  XAddHost(), XAddHosts(), XDisableAccessControl(), XEnableAccessControl(), XListHosts(), XRemoveHost(), XSetAccessControl().

Xlib - Host Access														    XRemoveHosts()
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