Mac OS X 10.4 or earlier: Computer stops responding
Learn how to get out of situations in which your computer may stop responding ("hang" or "freeze"). Troubleshooting beyond what is described in this article may be necessary to address any recurring issue. Important: Unsaved changes in your open applications will be lost. These steps apply to Mac OS X and Mac OS X Server. "Unresponsiveness" is often indicated by a spinning disc pointer and/or slow response time to input (or no response at all).
I have a strange problem with the FTP server on AIX 5.2. During the busiest time of the day, we get intermittent connection failures or timeouts connecting to the ftp server. The only thing clue that I can find is that daemon log shows the following message:
ftpd: /bin/ls: Resource temporarily... (2 Replies)
Hi Friends,
I have 1 NIS and 2 NFS, at every one time, the max number of user logged in is less than 60.
Everytime, I need to use the NIS. The system stops responding for around 10mins and back to normal and again stops responding again and back to normal.
Does anyone knows what is cause... (2 Replies)
ARP(3pm) User Contributed Perl Documentation ARP(3pm)NAME
ARP - Perl extension for creating ARP packets
SYNOPSIS
use Net::ARP;
Net::ARP::send_packet('lo', # Device
'127.0.0.1', # Source IP
'127.0.0.1', # Destination IP
'aa:bb:cc:aa:bb:cc', # Source MAC
'aa:bb:cc:aa:bb:cc', # Destinaton MAC
'reply'); # ARP operation
$mac = Net::ARP::get_mac("eth0");
print "$mac
";
$mac = Net::ARP::arp_lookup($dev,"192.168.1.1");
print "192.168.1.1 has got mac $mac
";
IMPORTANT
Version 1.0 will break with the API of PRE-1.0 versions, because the return value of arp_lookup() and get_mac() will no longer be passed as
parameter, but returned! I hope this decision is ok as long as we get a cleaner and more perlish API.
DESCRIPTION
This module can be used to create and send ARP packets and to get the mac address of an ethernet interface or ip address.
send_packet()
Net::ARP::send_packet('lo', # Device
'127.0.0.1', # Source IP
'127.0.0.1', # Destination IP
'aa:bb:cc:aa:bb:cc', # Source MAC
'aa:bb:cc:aa:bb:cc', # Destinaton MAC
'reply'); # ARP operation
I think this is self documentating.
ARP operation can be one of the following values:
request, reply, revrequest, revreply, invrequest, invreply.
The default ARP operation is reply.
get_mac()
$mac = Net::ARP::get_mac("eth0");
This gets the MAC address of the eth0 interface and stores
it in the variable $mac. The return value is "unknown" if
the mac cannot be looked up.
arp_lookup()
$mac = Net::ARP::arp_lookup($dev,"192.168.1.1");
This looks up the MAC address for the ip address 192.168.1.1
and stores it in the variable $mac. The return value is
"unknown" if the mac cannot be looked up.
SEE ALSO
man -a arp
AUTHOR
Bastian Ballmann [ Balle@chaostal.de ]
http://www.datenterrorist.de
COPYRIGHT AND LICENSE
Copyright (C) 2004-2007 by Bastian Ballmann
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.1 or,
at your option, any later version of Perl 5 you may have available.
perl v5.14.2 2009-04-24 ARP(3pm)