O comando route
tem a opção -p
no OpenSolaris e acredito no Solaris 10 também.
De man route
:
-p Make changes to the network route tables per-
sistent across system restarts. The operation
is applied to the network routing tables
first and, if successful, is then applied to
the list of saved routes used at system
startup. In determining whether an operation
was successful, a failure to add a route that
already exists or to delete a route that is
not in the routing table is ignored. Particu-
lar care should be taken when using host or
network names in persistent routes, as
network-based name resolution services are
not available at the time routes are added at
startup.
Eu acredito que ele os grava no arquivo /etc/inet/static_routes
se eles forem aplicados com sucesso.