tunnel point to point vs physical point to point

From: "jasonsig" <comp.techs@xxxxxxxxxxxxx>
Date: 30 Aug 2006 14:53:59 -0700

If you have 2 systems on a point to point link you would address them
by a /30 block? When creating 'gre' tunnel you can use /32 for example
ip addr add 1.0.0.1 peer 1.0.0.2 dev mydev.

why can't /32 of arbitray addressing be used on a point to point
between 2 systems?

.

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