By default, path MTU discovery on outgoing GRE tunnel connections is disabled. To enable GRE path MTU discovery, include the gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
- [edit system internet-options]
-
gre-path-mtu-discovery;
To disable GRE path MTU discovery, include the no-gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
- [edit system internet-options]
- no-gre-path-mtu-discovery;