.PS
# Sizes are in inches
linewid=3.0;
lineht=1.2;
down;
A: box "Application";
arrow "Adresse IP de www.example.org ?" ljust;
R: box "Résolveur";
right;
arrow at 1/4 <R.e,R.ne> "Adresse IP de www.example.org ?" above;
S: box width 1.6 "Serveur faisant autorité";
left;
arrow at 1/4 <S.w,S.sw> "2001:DB8:42::deca:fbad" below;
move to R;
down;
move 1.8;
M: box "Méchant";
up;
arrow at 1/2 <M.n,M.n> to R.s "2001:db8:666:1" rjust;
.PE