03-02-2007
Proper routing
I have a series of new machines that are internet facing (have IP's that are accessible via the 'net) and it has internal facing interfaces. I need to be able to communicate back to the internal network to a specific server which processes monitoring and e-mail traffic. I've been told that I should use the inside interface to pass back traffic so I checked it out today.
There is a route in the routetable that shows the path back inside and I am able to ping and traceroute the specific server so icmp is up however I'm unable to access ssh (not a big deal), e-mail or the monitoring port.
This info tells me I do have access (even if only icmp) however I don't have the necessary access for monitoring.
Anything I might have missed in my testing? More routing type info.
Carl
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LEARN ABOUT CENTOS
lwp::debug
LWP::Debug(3) User Contributed Perl Documentation LWP::Debug(3)
NAME
LWP::Debug - deprecated
DESCRIPTION
LWP::Debug used to provide tracing facilities, but these are not used by LWP any more. The code in this module is kept around
(undocumented) so that 3rd party code that happen to use the old interfaces continue to run.
One useful feature that LWP::Debug provided (in an imprecise and troublesome way) was network traffic monitoring. The following section
provide some hints about recommened replacements.
Network traffic monitoring
The best way to monitor the network traffic that LWP generates is to use an external TCP monitoring program. The Wireshark program
(<http://www.wireshark.org/>) is higly recommended for this.
Another approach it to use a debugging HTTP proxy server and make LWP direct all its traffic via this one. Call "$ua->proxy" to set it up
and then just use LWP as before.
For less precise monitoring needs just setting up a few simple handlers might do. The following example sets up handlers to dump the
request and response objects that pass through LWP:
use LWP::UserAgent;
$ua = LWP::UserAgent->new;
$ua->default_header('Accept-Encoding' => scalar HTTP::Message::decodable());
$ua->add_handler("request_send", sub { shift->dump; return });
$ua->add_handler("response_done", sub { shift->dump; return });
$ua->get("http://www.example.com");
SEE ALSO
LWP::UserAgent
perl v5.16.3 2012-01-14 LWP::Debug(3)