Yes, you can do this. In fact, you can do it in four different ways, depending on how you prefer to work.
1) Click the 'rescale' button. This will attempt an on-the-fly rescale of the graph, although the default will always be to show the 'max' line (for network traffic) or to scale to the date (for other data).
2) Set the 'unscaled = no' option in the routers2.conf. This will make *all* graphs default to scaled, ie, scale to the data not to the maxbytes.
3) Set 'routers.cgi*UnScaled[targetname]: none' for the target. This will make all of the graphs for that target show as scaled, even for network graphs. You can even specify for yearly to be scaled, but the rest not. Note that you can use the native MRTG 'UnScaled' directive too, but it won't allow a setting of blank or 'none'.
4) Choose your own scale using routers.cgi*UpperLimit[] and routers.cgi*LowerLimit[], and possibly routers.cgi*Options[]:rigid . See the documentation for details on this.
The reason for this is historical -- when routers2 was first produced, we wanted all network graphs to default to unscaled, and all others to default to scaled (most of our network ports were 10Mb then, or 100Mb maximum, and our WAN links were usually heavily used). routers.cgi picks what it believes to be a sensible default for the displaying of all graphs, although it will allow you to override this on a global or individual basis.
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