Useful RFCs

RFC3489 - STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs)
http://www.ietf.org/rfc/rfc3489.txt?number=3489

RFC1483 - Multiprotocol Encapsulation over ATM Adaptation Layer 5
http://www.ietf.org/rfc/rfc1483.txt?number=1483

RFC1577 - Classical IP and ARP over ATM
http://www.ietf.org/rfc/rfc1577.txt?number=1577