Change delay of link NS2

Let us say, we have two nodes called $node3 and $node4. To get your link, use

set myLink [[$ns link $n(0) $n(1)] link]

Note that this is not just the link, it is the link_ within the Link (manual page 68 http://www.isi.edu/nsnam/ns/doc/ns_doc.pdf or html version http://www.isi.edu/nsnam/ns/doc/node63.html). This is the part that manages the link delay. In order to change the link delay, use

$myLink set delay_ 1ms

This part can be found in ns-2.35/tcl/lib/ns-link.tcl