IPSec transport mode, mtu, fragmentation...

Andrey V. Elsukov bu7cher at yandex.ru
Mon Dec 23 09:41:26 UTC 2019

On 20.12.2019 19:22, Victor Sudakov wrote:
>> What's the root of the problem? ESP packets cannot get fragmented or
>> what? 
> Wireshark has shown that the "Don't Fragment" flag is set on all ESP
> (protocol 50) packets. Who does this, why, and how can I switch it off
> globally?


I think this DF flag is originally from TCP packet.
ESP xform for transport mode just replaces protocol in IP header and
adds some info to the end of a packet.

WBR, Andrey V. Elsukov

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