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would be interesting to hear details.

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Loss of ICMP packets generated by links with endpoints numbered in RFC1918 space. Holes in traceroutes, broken PMTU detection.

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Why do those links have endpoints in RFC1918 space to begin with?

Alex

Because some administrators are ignorant, clueless, or malicious. We don't all have the luxury of saying, "It doesn't work on our network and it does on our competitor's, and we could fix it if we wanted to at no significant harm to us, but we won't because we are in the right."

In that case you should not complain about 1918 space being used for say.. attacking you either. After all, it does work on the network of your competitors. ALex