Transcript PPT Version

IRTF SAM BoF
@69th IETF
XCAST team report
Yuji IMAI (WIDE Project)
1. Experimental Deployment Method for
Router Supported ALM using PlanetLab
•
draft-muramoto-irtf-sam-exp-testbed-00.txt
2. XCAST 2.0 overview
Topics of this report
•
How to develop, make real-world
experiments & deploy SAMs, smoothly?
Our 1st development & experiment trial
using the way to boot SAMs up in end-toend manner.
i.
•
based on VINI/PlanetLab platform
(http://www.vini-veritas.net/)
ii. Update of XCAST6 protocol for smoother
deployment.
•
Append method to deploy SAM logic on the core
router already in operation.
Difficulties of practical research of
SAMs
• How to put SAM protocol mechanism on the
running network?
– Case: IP multicast
• Install and activate multicast logic with ”all” routers in the
“whole” experimental network. But, some operators hesitate
or hate to change router config.
• Tunnel between experimental networks to jump non-multicast
network. That make situation complicated.
– Case: P2P, ALM
• Install end-to-end style and quick & easy boot-up.
• Even after ALM cause bad effect for networks, operators
could not optimize the traffic. Sometime ”just filtered-out”.
We need the methods to start and deploy easily at booting-up phase.
We also needs the methods to collaborate with existing network operators.
1.
Experimental Deployment Method for
Router Supported ALM using PlanetLab
draft-muramoto-irtf-sam-exp-testbed-00.txt
• Way to boot SAMs up in end-to-end manner
even when protocol need router assistance.
• Deploy SAM router logic using VINI/PlanetLab
platform.
– UML on Sliver: SAM routing engine to be deploy.
– Orbit: Overlay topology configuration tool.
– L2tp: gateway between SAM overlay and real-world
PL-VINI (SIGCOMM’06)
[http://vini-veritas.net/]
UML
XORP
(routing protocols)
eth0
eth1
eth2
eth3
Control
Data
Packet
Forward
Engine
Click
PlanetLab VM
UmlSwitch
element
Tunnel table
Filters
• Virtual Network
Infrastructure over
PlanetLab
• To allow slices to
experiment with network
layer without having to
modify kernel
• Two components
– UML (User Mode Linux) private network interfaces
for each VM
– “Click” - packet forwarding
engine
• Using openVPN for
external link
Deploying an SAM Overlay on
PlanetLab
• Use UML as a VM
– Enable kernel modification.
– Utilize kernel routing table
User Mode Linux ( UML )
+ SAM logic patch
SAM Demo
software
l2tpd
eth0
l2tpd
forwarder
eth1
eth2
eth3
UDP UDP
UDP
Tunnel Tunnel Tunnel
PlanetLabVM
eth
• Tunneling packet by
UDP tunneling
• L2TP enables
outside user to join the
overlay network
• UDP tunnels are
configured through an
automated script
SAM Orbit/PlanetLab and L2TP Access
User
Client
Orbit
•Deploy SAM engine
Real Network
•Make overlay connection
User Client can connect SAM Overlay
through L2TP Connection
L2TP Concentrator
PlanetLab Slice
SAM Overlay
SAM L2TP access
XCAST6 engine deployed world wide. (by Nobuo)
2. XCAST6-2.0 overview
• “Explicit Multicast (Xcast) Concepts and
Options” is going to be Experimental RFC.
– draft-ooms-xcast-basic-spec-13.txt
– Previously titled “Explicit Multicast (Xcast) Basic
Specification”
– IESG Evaluation is finished on 10th July and
Approved-announcement to be sent.
• During long experiments and reviewing process,
we find many points to be fixed.
• We are updating the spec and submit it as soon
as “Concepts and Options” would become RFC.
Points related with SAM deployment
• Eliminate the mark of the XCAST6 datagram by the IPv6
hop-by-hop option header.
– Router operators seriously hate IPv6 option header because
they are processed by CPU not on the silicon logic of L3 engine
of the network card. Sometimes they cause security accidents
and become DDoS targets.
• Instead, the experimental DSCP value will be use.
– Router can force to reroute XCAST6 datagram for specific
interfaces for annex boxes by hardware implemented filter.
– Annex boxes capture them, process XCAST6 logic and forward
results back to router.
– Minimize the impact for “routers in operation” and enable to
append SAM(XCAST6) logic by additional appliance.
Current Status
• I-D is ready to submit.
– Wait for issue of RFC “Concepts and Options”
to avoid confusion.
• Based on new I-D, routing logic was
implemented on several platform.
– FreeBSD 6.2
– Linux 2.6.21.X