Cheshire Cat Computing

I am designing a rough web site independent of the Routers2.cgi front end to more or less better discriminate the info that is most relevant (bandwidth utilization on ports of interest in our switches). By the way, I am running MRTG on a Win2k3 server. In the source code, to display a graph, I give the image source of the .png image in the C:\mrtg\wwwroot\graphs directory. However, when the page is refreshed after the 5 minute polling interval, the graph is not updated UNLESS I have that particular interface selected in the routers.cgi page. After looking at the directory, the .png was never updated unless I specifically selected it in the routers.cgi page. How can I ensure that all the .png images are updated every 5 minutes?

The graphs in the graphs directory are only created when needed by routers2, and then remain there in case another invocation requires them. So, you cannot directly link to them as there is no guarentee they will be created unless you go via routers2.

You can ask routers2 to give you the image, however. Use something like

IMG SRC=/cgi-bin/routers2.cgi?page=image&rtr=file.cfg&if=targetname&xgtype=d&xgstyle=n

in your image tag to get the image created on demand -- see the HOWTO documentation for use of this method. By using the Bookmark button in the routers2 interface, you can find out the required options to pass to the CGI for the image you require.

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Steve Shipway
UNIX Systems, ITSS, University of Auckland, NZ
Woe unto them that rise up early in the morning... -- Isaiah 5:11

Thanks Steve-
I will check that out!

Thanks again for the follow up Steve. I actually tried to use this as my img src:
"http:<ip>:9191/?rtr=10.10.1.1.cfg&xgtype=d&if=10.10.1.1_Fa1_0_1"

No luck though- no graph appears. I read the documentation on your site to try to find an answer. I wonder if I need to be more specific on the directory?

You MUST add the '&page=image' to the URL (see the example above) so that it knows to hand over just the image for a IMG tag. Otherwise, it will deliver up the HTML for the top frameset.

I see you are using the script as index.cgi or something similar in the root of the web server. I think this is how the Open Innovations Bundle installs it (ugly, but there you are). Usually it is better to give an explicit URL rather than making it default but thats just a convention, it should work your way.

_________________
Steve Shipway
UNIX Systems, ITSS, University of Auckland, NZ
Woe unto them that rise up early in the morning... -- Isaiah 5:11