Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2011-01-04
2011-01-04
Mills, Donald L (Department: 2462)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S410000, C370S466000, C709S225000
Reexamination Certificate
active
07864780
ABSTRACT:
Methods and apparatus for processing a DNS query by a NAT device are disclosed. A NAT device (e.g., NAT-PT device) receives the DNS query from a node. The NAT device then sends two DNS queries to a DNS server. Specifically, each of the DNS queries requests an IP address in a different version of IP (e.g., IPv4 or IPv6). For example, each of the DNS queries may request an A record or an AAAA record. When the NAT device receives two DNS replies from the DNS server, it forwards only one of the DNS replies to the node. Specifically, the DNS reply that is forwarded includes at least one answer record. DNS replies that do not include at least one answer record, or are received subsequent to forwarding the DNS reply to the node, are dropped by the NAT device.
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Baron Henry
Cisco Technology Inc.
Mills Donald L
Weaver Austin Villeneuve & Sampson LLP
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