This is an old revision of the document!
3 What is SKAT? Is it a router, or NAT, or transparent proxi? Or is it transparent for network devices?
SKAT is a DPI device similar to CISCO SCE. It operates as a bridge with no IP addresses assignment. It means it is invisible in a network. Its delay is no higher than 30 μs (16 μs according to tests). Therefore it is almost indistinguishable from the direct connection. Check SKAT connection schemes for details