By default, path maximum transmission unit (MTU) discovery on outgoing IP-IP tunnel connections is disabled. To enable IP-IP path MTU discovery, include the ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
- [edit system internet-options]
-
ipip-path-mtu-discovery;
To disable IP-IP path MTU discovery, include the no-ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
- [edit system internet-options]
- no-ipip-path-mtu-discovery;