Dear All,

I have set values to the *ECN* field of IPv4 packet Header at the *ingress
switch* using the *SET_FIELD* action in Ryu. At the controller(using *packet_in
from egress switch*), I want to read the ECN field. However reading the
packet header using RYU library (*ryu.lib.packet import ipv4*), only the
TOS field is recognised for reading.

Kindly suggest how to read only the ECN field that was set at the ingress
switch.

Thanks
Hadem.
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