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Does VPN use TCP/IP?

Does VPN use TCP/IP?
Donna,
A VPN operates at layer-3 using the IPSec protocol. It supports TCP, UDP and other layer-3 protocols. Some IPSec VPNs also use UDP and TCP to encapsulate IPSec packets in order to pass through NAT firewalls, routers and proxies.
Best,
Mark
This was last published in March 2003

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