Hi, On Mon, Nov 30, 2015 at 09:54:32PM +1300, Jason Haar wrote: > eg, if there's no UDP error checking built into openvpn, then shouldn't > DNS lookups (ie udp inside a udp openvpn tunnel) fail a lot? Or is the > Internet generally so reliable that it doesn't matter? (eg 1% packet > loss on Internet leads to 1% packet loss inside openvpn tunnel?)
This is how it is: if you have packet loss outside, you have packet loss
inside the tunnel as well - for good reason, OpenVPN does not add a
reliability layer here, because we have one: TCP.
If a DNS query gets lost, DNS knows how to retransmit - and this is how
layering is supposed to work.
Imagine doing real-time audio over OpenVPN. If a packet gets lost, you
hear a bit of noise, but then the stream goes on. If the lower layers
do retransmission, the stream will stop until the missing packet has been
retransmitted, and then you're out of sync... what now?
gert
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