Hadriel Kaplan wrote:
> Actually, it will cause problems for the device sending STUN, because that 
> next-hop proxy will (rightly) consider it a malformed attack and blacklist 
> the sender.

It's not reasonable for a proxy to blacklist source IPs sending it stuff 
it doesn't like.

If you receive a UDP packet, it's a really rare case that you can know 
that the source IP wasn't spoofed.

If you blacklist based on source IP addresses, it will be very easy to 
denial of service your proxy by getting it to blacklist real clients or 
other SIP proxies for example. That will be a much bigger problem for 
you than actually writing code that don't die when it receives unknown 
data (which you should do anyway, of course).

/Fredrik
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