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Date: Mon, 12 Oct 2015 09:06:05 -0400
From: Ernie Luzar <luzar722@gmail.com>
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Subject: Are udp packets with non-routeable ip addresses valid on public
 network?
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Hello List

I am receiving unsolicited inbound udp packets with a "to ip address" 
[10.0.10.1] of a computer on my LAN. Is this valid? Other tcp/udp 
packets from that LAN computer pass through the firewall NAT as 
expected. I added a firewall rule to block that packet and their are no 
outward signs of problems with that LAN computer.

On other LAN PC's that run ms/windows and facebook or yahoo are sending 
out bound udp packets with "from ip address" containing their LAN ip 
address. I bock these also without any outward signs of problems. These 
packets are not being NAT'ed like other udp packets from that LAN PC are.

I though non-routeable ip addresses are invalid on the public network.

Any ideas on what is occurring here?