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Doesn't NAT ICMP packets #15
Not sure what you mean by "pings don't need to survive the NAT process" - can you elaborate?
"Is there any support" - nope, but there should be. Thanks for bringing this RFC to my attention. Splitting the ICMP code out of mirage-tcpip's IPv4 module, like we did for ARP, would make handling ICMP as it specifies easier. As far as I can tell it should be possible, albeit potentially a bit redundant, to implement at least the error packet section within the current design of both mirage-tcpip and mirage-nat, though.
Is there a specific subset of the spec you need?