Hello.
Below output is from a 2901 router DMVPN tunnel interface.
QUESTIONS:
Why is the MTU size different between these outputs?
What exactly means "Tunnel transport MTU 1472 bytes"?
Why is the second bold data so specifically "MTU 17912?"
Thank you!
---
(obfuscated)
2901#sh ip int tu33
Tunnel33 is up, line protocol is up
Internet address is 192.168.0.1/24
Broadcast address is 255.255.255.255
Address determined by non-volatile memory
MTU is 1400 bytes
Helper address is not set
!! (output omitted) !!
2901#
2901#
2901#sh int tu33
Tunnel33 is up, line protocol is up
Hardware is Tunnel
Internet address is 192.168.0.1/24
MTU 17912 bytes, BW 20000 Kbit/sec, DLY 50000 usec,
!! (output omitted) !!
Tunnel transport MTU 1472 bytes
