Collaboration diagram for VPN services and libraries:

Modules
	DNS Service network protocol definitions

	DNS service

	Resolver service
	Asynchronous standard DNS lookups.

	TUN library
	Standard TCP/IP network structs and IP checksum calculations for TUN interaction.

	VPN service

Files
file	block_dns.h
	DNS network structs.

file	gnunet_dns_service.h
	API to access the DNS service.

file	gnunet_resolver_service.h
	Functions related to doing DNS lookups.

file	gnunet_tun_lib.h
	Standard TCP/IP network structs and IP checksum calculations for TUN interaction.

file	gnunet_vpn_service.h
	API to access the VPN service.

Detailed Description

Modules