NAT64 return traffic vanishes after successful de-alias

John W. O'Brien john at
Sun Dec 15 18:28:51 UTC 2019

On 2019/12/15 12:54, Andrey V. Elsukov wrote:
> On 15.12.2019 19:15, John W. O'Brien wrote:
>> Yes, this is exactly the problem. Thank you very much!
>> The reason it was working in the EC2 case is because the FreeBSD AMIs
>> set ipv6_activate_all_interfaces="YES".
>> It helps me quite a lot to learn the concept of "reschedules a packet
>> again on the same interface". That fills in a gap that I am sure will
>> come in handy when trying to reason about behavior in the future.
>> Incidentally, where are those drops counted? I did start looking at
>> "netstat -i" and "netstat -s" for clues, and even now that I know what
>> to look for, I'm not sure I know what I'm seeing. Is it "ip6: output
>> packets discarded due to no route"?
> I think you can see such drops in the `netstat -isp ip6` output for each
> specific interface in the `input datagram discarded` row.

Ah, yes, that looks right. If I had waded further through the dizzying
array of netstat modes, I might have noticed upon that. Thank you again
for your help.

John W. O'Brien
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