Solved: nping - libnsock mksock_bind_addr(): Bind to 2001:db8:1::1:0 failed (IOD #1): Cannot assign requested address (99)

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 Problem:

  When using nping (which comes with nmap) we receive the message:

libnsock mksock_bind_addr(): Bind to 2001:db8:1::1:0 failed (IOD #1): Cannot assign requested address (99)

Current situation:

  The issue is that nping can not bind to the IP 2001:db8:1::1

Solution:

  There could be many different solutions, I'm only going to mention one.  What I did was to create a logical interface (tunnel type) with the IPv6 address I was needing (2001:db8:1::1). Here you have the commands.

ip tuntap add mode tun dev tun1

ip -6 addr add 2001:db8:1::1 dev tun1

ifconfig tun1 up

Finally, you could execute something like:

nping -6 -S 2001:db8:1::1 --tcp-connect -c 2 -p 53 <ipv6_dest> --source-mac 00:50:XX:XX:XX:35  --dest-mac 2c:XX:XX:XX:44:20

Hope this is useful