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[MMUSIC] Question on Forming Candidate Pairs in ICE-17



Hi Jonathan,
 
probably I'm annoying you - but I need to address the topic of pairing a addresses of local scope with addresses global scope once again, this time with the focus on IPv4 addresses.
 
Given the following candidates
local                     remote
10.0.0.8 host             192.168.34.33 host
210.221.23.4 srflx        210.123.44.14 srflx
210.221.25.1 relayed
 
As I've understood ICE-17, we would get the following candidate pairs:
    10.0.0.8-192.168.34.33
    10.0.0.8-210.123.44.14
210.221.23.4-210.123.44.14
210.221.25.1-192.168.34.33 (**)
210.221.25.1-210.123.44.14
My question now is, in what case it makes sense to piar a candidate of a private IP address (192.168.34.33 in this example) with one of a public IP address (210.221.25.1)? In my understanding, the connectivity checks for such pairs will always fail ... 

Note that RFC3330 states:
"192.168.0.0/16 - This block is set aside for use in private networks.
Its intended use is documented in [RFC1918]. Addresses within this
block should not appear on the public Internet."
The same is stated for the block 10.0.0.0/8
 
Regards,
   Meinrad
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