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I have imported line vector layer and point vector layer(12 points) to grass using v.in.ogr. Now i want to use v.in.salesman to find shortest path between these 12 points, but i couldnt input anything in "Input nodes" field.

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As far as I know, before using v.net.salesman to get your route, you should connect your points layer to your network (line vector layer) using v.net op=connect [1] at nlayer=2

Once you connect your 12 points to your network as nodes, you'll be able to select your nodes layer from the "input nodes" dropdown menu.

Hope this helps.
Cheers,
Lluís

[1] http://grass.osgeo.org/grass64/manuals/v.net.html

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