Hi,

“The router should be pingable, and should generate an ICMP echo reply in 
response to an ICMP echo request.” —— OpenFlow Tutorial – Create Router

Could you give me an example how to generate a ICMP reply message?

I suppose that first create packet_base instance, then add ipv4 header, and 
then icmp header?

Is there a way to copy necessary information from ICMP request to reply 
message, and then modify some attributes?

How about ICMP unreachable message?

Thanks,
Weiyun

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