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+Network Working Group O. Gsenger
+Internet-Draft March 2007
+Expires: September 2, 2007
+
+
+ Anycast stream relaying
+ draft-gsenger-anycast-relay-00
+
+Status of this Memo
+
+ By submitting this Internet-Draft, each author represents that any
+ applicable patent or other IPR claims of which he or she is aware
+ have been or will be disclosed, and any of which he or she becomes
+ aware will be disclosed, in accordance with Section 6 of BCP 79.
+
+ Internet-Drafts are working documents of the Internet Engineering
+ Task Force (IETF), its areas, and its working groups. Note that
+ other groups may also distribute working documents as Internet-
+ Drafts.
+
+ Internet-Drafts are draft documents valid for a maximum of six months
+ and may be updated, replaced, or obsoleted by other documents at any
+ time. It is inappropriate to use Internet-Drafts as reference
+ material or to cite them other than as "work in progress."
+
+ The list of current Internet-Drafts can be accessed at
+ http://www.ietf.org/ietf/1id-abstracts.txt.
+
+ The list of Internet-Draft Shadow Directories can be accessed at
+ http://www.ietf.org/shadow.html.
+
+ This Internet-Draft will expire on September 2, 2007.
+
+Copyright Notice
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+ Copyright (C) The IETF Trust (2007).
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+Gsenger Expires September 2, 2007 [Page 1]
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+Internet-Draft Anycast stream relaying March 2007
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+Abstract
+
+ The anycast tunneling (anytun) protocol defines a protocol used for
+ communication between unicast clients and anycast servers. It can be
+ used for tunneling information between 2 clients over the servers or
+ in relay mode to transmit data form the client over the servers to a
+ third party not using the protocol and vice versa.
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+Gsenger Expires September 2, 2007 [Page 2]
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+Internet-Draft Anycast stream relaying March 2007
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+1. Introduction
+
+ anytun defines a Host Anycast Service as defined in rfc1546. It can
+ be used to build high scalable and redundant tunnel services. It
+ supports both UDP and TCP connections. Additionally to the
+ possibility of establashing an unicast TCP connection over an anycast
+ address as suggested in rfc1546, it supports real anycast TCP
+ connections with state syncronisation and heuristic state forecast.
+ It also has a relay mode, that makes it possible, that only one of
+ the connection endpoints has to use the anytun protocol. This can be
+ used to make connections through Firewalls or behind a NAT Router
+
+ RFC3068 [1] DTD.
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+Gsenger Expires September 2, 2007 [Page 3]
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+2. Operation modes
+
+ This section gives an overview of possible operation modes und usage
+ scenarios. Please note, that the protocols used in the figures are
+ only examples and that anytun itself does not care about either
+ transport protocols or encapsulated protocols. Routing and network
+ address translation is not done by anytun. Each implemetation MAY
+ choose it's own way of doing this task (e.g. using functions provided
+ by the operating system). Anytun is used to establish and controll
+ tunnnels, to encapsulate and encrypt data.
+
+2.1. Tunnel modes
+
+2.1.1. Tunneling Mode
+
+ An example of anytun used in tunnel mode
+
+ ----------- -----------
+ | RTP | ---------- | RTP |
+ ----------- -> |server 1| -> -----------
+ | UDP | ---------- | UDP |
+ ----------- -----------
+ ----- | IPv6 | ---------- | IPv6 | -----
+ | | -> ----------- -> |server 2| -> ----------- -> | |
+ ----- | anytun | ---------- | anytun | -----
+ ##### ----------- ----------- #####
+ | UDP | ---------- | UDP |
+ client 1 ----------- -> |server 3| -> ----------- client 2
+ | IPv4 | ---------- | IPv4 |
+ ----------- -----------
+ | ... | anycast | ... |
+
+ Figure 1
+
+ In tunneling mode the payload of the anytun packet is transmitted
+ from one unicast host to the anycast server. This server makes a
+ routing descision based on the underlying protocol and transmits a
+ new anytun package to one or more clients depending on the routing
+ descition. The server MAY also route the packet to a directly
+ connected network or a service running on the server, but please
+ note, that this is only usefull for anycast host services like DNS
+ and that the services HAVE TO be running on all servers in order to
+ work.
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+2.1.2. Open tunnel mode
+
+ An example of anytun used in open tunnel mode
+
+ -----------
+ | RTP | ----------
+ ----------- -> |server 1| ->
+ | UDP | ---------- -----------
+ ----------- | RTP |
+ ----- | IPv6 | ---------- ----------- -----
+ | | -> ----------- -> |server 2| -> | UDP* | -> | |
+ ----- | anytun | ---------- ----------- -----
+ ##### ----------- | IPv6* | #####
+ | UDP | ---------- -----------
+ client 1 ----------- -> |server 3| -> | ... | host
+ | IPv4 | ---------- not using
+ ----------- anytun
+ | ... | anycast
+ *changed source address
+ or port
+
+ Figure 2
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+ In open tunnel mode only one of two clients talking to each other
+ over the servers MUST use the anytun protocol. When a client using
+ the anytun protocol wants to tunnel data, it is building a connection
+ to the anycast servers using the anytun protocol. The anycast
+ servers relay the encapsulated packages directly to the destination
+ without using the anytun protocol. The source address of the
+ datagramm HAS TO be changed to the anycast address of the server.
+ The anytun servers act like a source NAT router, therefor for the
+ destination it saems that it is talking to the client directly.
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+2.1.3. relay mode
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+ An example of anytun used in relay mode
+
+ -----------
+ ----- | RTP | ----------
+ | | -> ----------- -> |server 1| ->
+ ----- | UDP** | ---------- -----------
+ ##### ----------- | RTP |
+ | IPv6**| ---------- ----------- -----
+ host ----------- -> |server 2| -> | UDP* | -> | |
+ not using | ... | ---------- ----------- -----
+ anytun | IPv6* | #####
+ ---------- -----------
+ ----------- -> |server 3| | ... | host
+ ----- | anytun | ---------- not using
+ | | -> ----------- anytun
+ ----- | IPv4 | anycast
+ ##### -----------
+ connection| ... |
+ controller
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+ *changed source address or port
+ **changed destination address or port
+
+ Figure 3
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+ In relay mode the anycast serveres directly repaet the packetes of
+ clients, only the source and destination addresses are changed. The
+ anytun protocol is only used for controll messages, but not fr
+ encapsulation.
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+2.2. Transport modes
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+Gsenger Expires September 2, 2007 [Page 6]
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+2.2.1. anycast udp mode
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+ An example of anytun used with udp transport
+
+ ----------- -----------
+ | RTP | ---------- | RTP |
+ ----------- -> |server 1| -> -----------
+ | UDP | ---------- | UDP |
+ ----------- -----------
+ ----- | IPv6 | ---------- | IPv6 | -----
+ | | -> ----------- -> |server 2| -> ----------- -> | |
+ ----- | anytun | ---------- | anytun | -----
+ ##### ----------- ----------- #####
+ | UDP | ---------- | UDP |
+ client 1 ----------- -> |server 3| -> ----------- client 2
+ | IPv4 | ---------- | IPv4 |
+ ----------- -----------
+ | ... | anycast | ... |
+
+ Figure 4
+
+ In anycast udp mode the data between clients and anycast serveres is
+ carried by udp packets. Packets are routed by the serveres from one
+ client to another. Because udp is stateless no inforamtion has to be
+ syncronised
+
+2.2.2. anycast light udp mode
+
+ An example of anytun used with udp transport
+
+ ----------- -----------
+ | RTP | ---------- | RTP |
+ ----------- -> |server 1| -> -----------
+ | UDP | ---------- | UDP |
+ ----------- -----------
+ ----- | IPv6 | ---------- | IPv6 | -----
+ | | -> ----------- -> |server 2| -> ----------- -> | |
+ ----- | anytun | ---------- | anytun | -----
+ ##### ----------- ----------- #####
+ |lightUDP | ---------- |lightUDP |
+ client 1 ----------- -> |server 3| -> ----------- client 2
+ | IPv4 | ---------- | IPv4 |
+ ----------- -----------
+ | ... | anycast | ... |
+
+ Figure 5
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+ The light UDP mode is neerly the same as the normal UDP mode, the
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+Gsenger Expires September 2, 2007 [Page 7]
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+ only difference is, that the udp size is set to the udp header lenght
+ and not to the length of the full packet and therefor the checksum is
+ only calculated for the udp header itself. So there is no error
+ correction or detection done on the payload. This can be usefull if
+ realtime data is beeing transimittet or the tunneled protocol does
+ error correction/detection by itself.
+
+2.2.3. Protocol specification
+
+2.2.3.1. Header format
+
+2.2.3.2. Protocol field
+
+ The protocol field defines the payload protocol. ETHER TYPE protocol
+ numerbers are used. http://www.iana.org/assignments/ethernet-numbers
+ . The values 0000-05DC are reserverd and not used at the moment.
+
+ Some exmples for protocol types
+
+ HEX
+ 0000 Reserved
+ .... Reserved
+ 05DC Reserved
+ 0800 Internet IP (IPv4)
+ 6558 transparent ethernet bridging
+ 86DD IPv6
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+ Figure 6
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+Gsenger Expires September 2, 2007 [Page 8]
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+Appendix A. The appan
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+Gsenger Expires September 2, 2007 [Page 9]
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+3. References
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+ [1] Huitema, C., "An Anycast Prefix for 6to4 Relay Routers",
+ RFC 3068, June 2001.
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+Gsenger Expires September 2, 2007 [Page 10]
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+Internet-Draft Anycast stream relaying March 2007
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+Author's Address
+
+ Othmar Gsenger
+ Sporgasse 6
+ Graz 8010
+ AT
+
+ Phone:
+ Email: otti@wirdorange.org
+ URI: http://anytun.org/
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+Gsenger Expires September 2, 2007 [Page 11]
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+Full Copyright Statement
+
+ Copyright (C) The IETF Trust (2007).
+
+ This document is subject to the rights, licenses and restrictions
+ contained in BCP 78, and except as set forth therein, the authors
+ retain all their rights.
+
+ This document and the information contained herein are provided on an
+ "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
+ OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
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+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
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+ WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+
+
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+
+Acknowledgment
+
+ Funding for the RFC Editor function is provided by the IETF
+ Administrative Support Activity (IASA).
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+Gsenger Expires September 2, 2007 [Page 12]
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