[P4-discuss] Identification field in ping

Phanindra Palagummi phanindra.palagummi at gmail.com
Fri Oct 27 15:36:18 EDT 2017


Hello,

During ingress process I am trying to change the *ipv4.identification
number*.

hdr.ipv4.identification =
(bit<16>)meta.intrinsic_metadata.ingress_global_timestamp;

I see ping is not working (i.e, echo request is sent, but reply is not
generated by destination host) and when I comment the above code line it is
working properly.
I tried but couldn't get the significance of ipv4.identification field in
ping (between two hosts in mininet).
Please help me in understanding this.

Sorry for putting the question which is not specific to P4.

Thank you,
Phani
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