Difference between revisions of "The Wunet Protocol"
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It was developed primarily for educational purposes during the Fall 2009 semester for a course in the Computer Science and Engineering Department at Washington University in St. Louis. | It was developed primarily for educational purposes during the Fall 2009 semester for a course in the Computer Science and Engineering Department at Washington University in St. Louis. | ||
− | This page describes the features of Wunet. | + | This page describes the features of Wunet and gives several examples. |
These features include: | These features include: | ||
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* ''No-Route Flooding'' | * ''No-Route Flooding'' | ||
** A unicast packet with no matching route table entry is forwarded by flooding. | ** A unicast packet with no matching route table entry is forwarded by flooding. | ||
− | * ''Upstream Propagation'' | + | * ''Upstream Packet Propagation'' |
** A multicast SUBSCRIBE packet with no matching route table entry is propagated toward the root of its multicast tree. | ** A multicast SUBSCRIBE packet with no matching route table entry is propagated toward the root of its multicast tree. | ||
− | * '' | + | * ''Spoofing Protection'' |
** XXX | ** XXX | ||
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We plan to implement a GPE-only version of Wunet on the GENI deployment of the SPP as a precursor to implementing a fastpath verion involving the NPR. | We plan to implement a GPE-only version of Wunet on the GENI deployment of the SPP as a precursor to implementing a fastpath verion involving the NPR. | ||
− | = A Wunet | + | = A Wunet Virtual Network = |
+ | = Basic Unicast DATA Packet Routing = | ||
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+ | = Basic Multicast DATA Packet Routing = | ||
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+ | = Basic SUBSCRIBE/UNSUBSCRIBE Routing = | ||
+ | |||
+ | = Route Learning = | ||
+ | |||
+ | = Flooding = | ||
+ | |||
+ | = Upstream SUBSCRIBE Packet Propagation = | ||
+ | |||
+ | = Spoofing Protection = | ||
= Wunet Concepts = | = Wunet Concepts = | ||
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== ST (Stats Table) == | == ST (Stats Table) == | ||
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Revision as of 00:35, 1 February 2010
Contents
- 1 History of Wunet
- 2 A Wunet Virtual Network
- 3 Basic Unicast DATA Packet Routing
- 4 Basic Multicast DATA Packet Routing
- 5 Basic SUBSCRIBE/UNSUBSCRIBE Routing
- 6 Route Learning
- 7 Flooding
- 8 Upstream SUBSCRIBE Packet Propagation
- 9 Spoofing Protection
- 10 Wunet Concepts
- 11 Wunet Features
- 12 Wunet Packet Header
- 13 Wunet Tables
History of Wunet
The Wunet Protocol is a simplified version of the Forest Protocol. Like Forest, Wunet is an overlay network that supports unicast and multicast traffic. But Wunet only supports only a rudimentary form of multicast and there is no provision for error control (e.g., dropped bits). It was developed primarily for educational purposes during the Fall 2009 semester for a course in the Computer Science and Engineering Department at Washington University in St. Louis.
This page describes the features of Wunet and gives several examples. These features include:
- Network Virtualization
- Wunet is a virtual network overlayed over an IP network in which each Wunet packet is carried inside a UDP packet.
- Unicast and Multicast Packets
- There are unicast and multicast DATA packets and multicast SUBSCRIBE and UNSUBSCRIBE multicast packets.
- Route Learning
- A router will add a reverse route for any incoming packet with a source address not found in the routing table
- No-Route Flooding
- A unicast packet with no matching route table entry is forwarded by flooding.
- Upstream Packet Propagation
- A multicast SUBSCRIBE packet with no matching route table entry is propagated toward the root of its multicast tree.
- Spoofing Protection
- XXX
A version of Wunet that is targeted at conventional processors has been implemented in C++. We plan to implement a GPE-only version of Wunet on the GENI deployment of the SPP as a precursor to implementing a fastpath verion involving the NPR.
A Wunet Virtual Network
Basic Unicast DATA Packet Routing
Basic Multicast DATA Packet Routing
Basic SUBSCRIBE/UNSUBSCRIBE Routing
Route Learning
Flooding
Upstream SUBSCRIBE Packet Propagation
Spoofing Protection
Wunet Concepts
A Wunet network consists of a set of nodes consisting of hosts and router nodes. Each node has a 32-bit virtual node address (vaddr). By convention hosts have virtual node addresses between 1 and 99, and routers have addresses that are typically multiples of 100 (e.g., 300). A multicast address is any 32-bit address with its high-order bit set (i.e., any decimal number greater than 2^31-1 = 2,147,483,647).
- Virtual Node
- Vaddr (Virtual address)
- Vnet (Virtual Network)
- Vlink (Virtual Link)
- Subscribe/Unsubscribe
Wunet Features
- UDP Encapsulation:
- Each packet is encapsulated in UDP packet
- Virtual Addresses:
- There are unicast addresses(e.g., 21, 200) and
- Multicast addresses(e.g., 2200110011 = x832303BB) addresses.
- Any address with high-order bit set is mcast addr; i.e., any decimal number greater than 2^31-1 = 2,147,483,647.
- Packet Types: DATA, SUBSCRIBE, UNSUBSCRIBE
- Routing:
- Packets are routed by (vnet, vaddr)
- Route Learning:
- A router will add a reverse route for any incoming packet with a source address not found in the routing table
- Joining/Leaving Multicast Group:
- A host joins/leaves a multicast group using SUBSCRIBE/UNSUBSCRIBE
- Multicast tree is formed for each vnet through SUBSCRIBE packets that travel up the multicast tree
- Missing Routes:
- Unicast Data: Flood all downstream links when there is no route.
- Multicast Data: Send subscriptions upstream when there is no route.