i have a conflict. Despite the use of IPSec Tunnel in Crypto Map mode, the overhead is not calculated. The IP MTU value for us is 1500. I execute the command: "ping -f -l 1472 10.1.240.155" that is, I have 28 bytes as overhead. 20 bytes "new IP overhead or external IP" + 8 bytes ICMP overhead. How was IPSec (ESP header, ESP trailer, etc.) calculated here? I see nothing. Can someone please explain that?
I checked the link so I asked the question. IP MTU 1500 bytes New IPv4 header for IPsec 20 bytes ESP header 8 bytes ESP IV 16 bytes Original IPv4 header 20 bytes Original IPv4 Paylod X byte ESP trailer 36 bytes
20 + 8 + 16 + 20 + 36 = 100 byte overhead That means I didn't have to have more than 1400 Byte IP Paylod. but I can send 1472 bytes with ICMP.
interface GigabitEthernetX / X / X / X . . . . . crypto ipsec df-bit clear
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