Cabletron Systems SmartSwitch Router Reference Manual page 90

-IP-E-NOTEN0 A default route cannot be set with a gateway reachable via en0
Explanation:
This message appears when the user is trying to add a default route such that packets
that match the default route will be sent on the en0 interface. This is not allowed,
because the en0 interface is reserved for management purposes.
Recommended Action:
Do not specify en0 as the gateway interface. Do not use a device which is connected
to en0 as a gateway.
-IP-E-ORPHANMASK rn_delete: Orphaned Mask <number> at <number>
Explanation:
The software component that manages IP resources has detected an internal error.
Recommended Action:
If this message is displayed repeatedly please contact Cabletron Technical Support.
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Chapter 11: IP Stack Error Messages
SSR-8 Error Reference Manual