Archiv für Oktober 2008

No loopback interface on Windows (XP)

Mittwoch, 22. Oktober 2008

Learned today that Windows doesn’t support a loopback interface for localhost. In consequence, network packets destined for the local machine are never passed to any interface and therefore can’t be captured by a packet sniffer. Unfortunately, looking at the network is my preferred way of diagnosing network problems, so this behavior gets in the way. An easy workaround is to route packets to a local address to the standard gateway instead. The gateway then sends the packets back to the local machine. This is a bit of a detour, but at least the traffic shows up. This dramatically changes how the packets are being moved around, so it might not help… But just in case:

  1. grab your IP address and Gateway using ipconfig in a DOS box.
  2. route add $LOCAL_IP mask 255.255.255.255 $GATEWAY_IP metric 1
  3. when you’re done, use route delete $LOCAL_IP to get things back to normal

Visualizing Ant Redux.

Dienstag, 14. Oktober 2008

I’ve written a small update to my ant-file visualization tool. The only visible change is that the default task is now marked in the output.

You can either download the jar containing everything you need, or build it yourself from the source available via:

svn co http://a2800276.googlecode.com/svn/branches/antvis

If Antvis is run from the command line like so:

$ java -jar antvis.jar
usage: [jre] antvis.AntVis -f inputFile [-t format] [-o outfile]
	format: format supported by dot. Default: `dot`
	outfile: Default stdout
call [jre] antvis.AntVis -l for a list of supported formats

It prints out the available options. If it’s called correctly:

$ java -jar antvis.jar -f build.xml -t png -o self.png

It will produce graphical representations of the provided build.xml file like this one

self.png

for Antviz’s own build.xml or this one

jpos_ant.png

The above is an example of a more complicated build.xml script, it ships with jpos.