Wednesday 6 June 2012

Checking currently used AS paths from a given IP

Initially, input the given IP in the search box at http://bgp.he.net/.
You will get its corresponding announcement IP address with prefix.

Here the announcement is as 117.204.160.0/20.
As you can see, there can be more than one announcements per IP but the prefix length will be different.
Greater the prefix length, more will be the sub network selectivity.

Then go to http://bgplay.routeviews.org/ and click on "Start BGPlay" button.


Accept the java applet permissions.

Here, enter the earlier prefix found by you.
Select the from-to dates as necessary. You can get current status by entering the latest date range or you can get a more stable status by selecting a longer time span of say 3-4 months.

After executing, fast forward it till the end to get the completed picture.
A sample run is shown below,

The nodes in the graph are the ASNs.
Here we observe that maximum connections(lines) are delivered through AS6453(TATA) and AS18101(Reliance).

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