Stateless protocol translation
Some aspects of the methods and systems presented relate to performing stateless address translation between IPv4 capable devices to IPv6 capable networks and devices. Stateless address translation may form a new IPv6 addresses by combining the IPv4 address of a device with an IPv6 prefix address assigned to the translator. The translation may also combine the IPv4 destination address and UDP port information with the new IPv6 address. Existing Domain Name Systems (DNSs) may be leveraged for resolving the IPv4 and IPv6 addresses across different networks.
1. A method comprising:
receiving, from a network, a first packet comprising a first source address, a first destination address, and a data payload, wherein the first source address and the first destination address are formatted according to a first address format;
generating a second source address formatted according to a second address format different from the first address format, wherein the second source address comprises a prefix address, the first source address, and the first destination address;
performing a reverse domain name system (DNS) lookup of the first destination address to obtain a destination domain name;
performing a DNS lookup of the destination domain name to obtain a second destination address formatted according to the second address format; and
generating a second packet comprising the second source address, the second destination address, and the data payload.
2. The method of claim 1 , wherein the first address format is an Internet Protocol version 4 (IPv4) address format and the second address format is an Internet Protocol version 6 (IPv6) address format.
3. The method of claim 1 , wherein the DNS lookup comprises a quad-A (AAAA) record DNS lookup.
4. The method of claim 1 , wherein the performing the reverse DNS lookup comprises:
sending, to a server, a query based on the first destination address; and
receiving, from the server, a response comprising the destination domain name.
5. The method of claim 4 , further comprising:
extracting, from the first packet, a User Datagram Protocol (UDP) destination port number; and
sending, to the server, an indication of the UDP destination port number.
6. The method of claim 1 , wherein the performing the DNS lookup comprises:
sending, to a server, a query based on the destination domain name; and
receiving, from the server, a response comprising the second source address.
7. The method of claim 1 , further comprising:
extracting, from the first packet, a UDP source port number and a UDP destination port number; and
adding, to the second packet, the UDP source port number and the UDP destination port number.
8. An apparatus comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the apparatus to:
receive, from a network, a first packet comprising a first source address, a first destination address, and a data payload, wherein the first source address and the first destination address are formatted according to a first address format;
generate a second source address formatted according to a second address format different from the first address format, wherein the second source address comprises a prefix address, the first source address, and the first destination address;
perform a reverse domain name system (DNS) lookup of the first destination address to obtain a destination domain name;
perform a DNS lookup of the destination domain name to obtain a second destination address formatted according to the second address format; and
generate a second packet comprising the second source address, the second destination address, and the data payload.
9. The apparatus of claim 8 , wherein the first address format is an Internet Protocol version 4 (IPv4) address format and the second address format is an Internet Protocol version 6 (IPv6) address format.
10. The apparatus of claim 8 , wherein the DNS lookup comprises a quad-A (AAAA) record DNS lookup.
11. The apparatus of claim 8 , wherein the instructions, when executed by the one or more processors, cause the apparatus to perform the reverse DNS lookup by:
sending, to a server, a query based on the first destination address; and
receiving, from the server, a response comprising the destination domain name.
12. The apparatus of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the apparatus to:
extract, from the first packet, a User Datagram Protocol (UDP) destination port number; and
send, to the server, an indication of the UDP destination port number.
13. The apparatus of claim 8 , wherein the instructions, when executed by the one or more processors, cause the apparatus to perform the DNS lookup by:
sending, to a server, a query based on the destination domain name; and
receiving, from the server, a response comprising the second source address.
14. The apparatus of claim 8 , wherein the instructions, when executed by the one or more processors, further cause the apparatus to:
extract, from the first packet, a UDP source port number and a UDP destination port number; and
add, to the second packet, the UDP source port number and the UDP destination port number.
15. A non-transitory computer-readable medium storing instructions that, when executed, cause:
receiving, from a network, a first packet comprising a first source address, a first destination address, and a data payload, wherein the first source address and the first destination address are formatted according to a first address format;
generating a second source address formatted according to a second address format different from the first address format, wherein the second source address comprises a prefix address, the first source address, and the first destination address;
performing a reverse domain name system (DNS) lookup of the first destination address to obtain a destination domain name;
performing a DNS lookup of the destination domain name to obtain a second destination address formatted according to the second address format; and
generating a second packet comprising the second source address, the second destination address, and the data payload.
16. The non-transitory computer-readable medium of claim 15 , wherein the first address format is an Internet Protocol version 4 (IPv4) address format and the second address format is an Internet Protocol version 6 (IPv6) address format.
17. The non-transitory computer-readable medium of claim 15 , wherein the instructions, when executed, cause the performing the reverse DNS lookup by:
sending, to a server, a query based on the first destination address; and
receiving, from the server, a response comprising the destination domain name.
18. The non-transitory computer-readable medium of claim 17 , wherein the instructions, when executed, further cause:
extracting, from the first packet, a User Datagram Protocol (UDP) destination port number; and
sending, to the server, an indication of the UDP destination port number.
19. The non-transitory computer-readable medium of claim 15 , wherein the instructions, when executed, cause the performing the DNS lookup by:
sending, to a server, a query based on the destination domain name; and
receiving, from the server, a response comprising the second source address.
20. The non-transitory computer-readable medium of claim 15 , wherein the instructions, when executed, further cause:
extracting, from the first packet, a UDP source port number and a UDP destination port number; and
adding, to the second packet, the UDP source port number and the UDP destination port number.