RFC1918 addresses to permit in for VPN?

["Miguel A.L. Paraz" <map () internet org ph>]

Our DSUA filter had to have a small hole punched in since a customer had a VPN
(I do not know yet as to what kind) which was receiving packets sourced at 
172.17.x.x.  Is this a misconfiguration on the sender's end, or a "feature."  

I think there was earlier discussion on VPN's requiring ICMP (echo?)


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