linux, wlan & mipv6
TRANSCRIPT
index Background: get wireless What’s Mobile IPv6 WLAN,MIPv6 in Linux More interesting hot topics Conclusion & QA time
The Big Background
IP changed the world
1969 ARPANET
1981 IETF IPv4 protocol
Internet user keep increasing
a shared platform for information
意大利机构Gandalf统计（数据截至2004年上半年）
Wire to wirelessCore Network : plenty of bandwidth
multi-gigabit router/switch
fibers
Access network: wire to wireless
ADSL/Cable/Dial up/Ethernet
802.11,802.15,802.16,802.20 series
GPRS/CDMA1x/EDGE/3G/B3G/4G...无处不在的接入
Network & Service Convergence:IP
Traditional
different services accord different networks
New trend
IP as the common networking layer
Everything over IP (services)
IP over everything (networks)
IPv6 layer
CableAccess
Wireless LAN PSTN
2.5G/3G/B3G/4G
Voice
ATM/Fiber…….
MultiMedia
PANPEN Game Business Email
WWWCallCenter
DigitalLife ….
An open IPv6 transport platform
WiredLAN
PDA Cellphone PC vehicleE
Home Camera ….
index Background: get wireless What’s Mobile IPv6 WLAN, MIPv6 in Linux More interesting hot topics Conclusion & QA time
Mobile IPv6
What’s Mobile IPv6
a node always identified by its home address
Why Mobile IP
Internet routing is based on the subnet prefix in a packet’s destination IP address
How dose it work
MN:Mobile NodeHA:Home AgentCN:Correspondent node
IPv6 basicIP version 6 : the successor to IPv4
Expanded addressing capabilities
Header format simplification
Improved support for extensions
Flow labeling capability
Authentication and privacy capability
index Background: get wireless What’s Mobile IPv6 WLAN, MIPv6 in Linux More interesting hot topics Conclusion & QA time
MIPv6 for LinuxCurrently two implementation available:
http://www.cs-ipv6.lancs.ac.uk/MobileIP/ (but obsolete)
HUT MIPL project: http://www.mobile-ipv6.org/ (Up to date)(GPL)
now developed by HUT GO-Core project and USAGI/WIDE Project (www.linux-ipv6.org)
try to make it to the main line kernel
The protocol structure
In Linux kernel 3 Parts: MN,CN & HA
main codes:net/ipv6/mobile_ipv6
Steps to install
Download
unpack and patch the kernel
make config
compile the kernel and install
make userspace tools
do some configurations
Linux & Wireless
Wireless
802.11 series : fast
Bluetooth : low power
GPRS/GSM : long distance
IrDa(Infrared Data) : cheap
802.11 WLAN
IEEE 802.11 series
802.11a - 5GHz (54Mbps) , 802.11n...
802.11b,11g - 2.4GHz (11Mbps/54Mbps)
MAC layer: CSMA/CA,WEP,SSID
WLAN Card
Intersil Prism (Compaq,Nokia,Linksys,D-link..)
Lucent Hermes(Lucent Orinoco,Apple Airport)
802.11 WLAN networking
Ad hoc mode
Infrastructure mode
Access Point (as a bridge)
roaming between APs
Linux WLAN support
Two part:
WLAN API (Wireless Extensions proj)
iwconfig (user space tools)
WLAN device driver
802.11 support of Linux
‘The Linux Wireless LAN Howto’
Drivers including:
Orinoco WLAN Driver: part of kernellinux-wlan-ng (linux-wlan project)Host AP driver (support prism chip AP mode)Linux Symbol Spectrum driver (support Symbol PCMCIA card)Atmel USB WLAN Driver
What happens when u insert a WLAN card
Insert a Intersil WLAN CF cardEvent handler called (orinoco_cs module)transfer related message to ‘cardmgr’match ‘/etc/pcmcia/config’ related item & load the right driver‘cardmgr’ call /etc/wirelss/wireless script to configure: WEP,SSID,etc; start DHCP..in orinoco module:
call register_netdev to get an ethX nameregister a interrupt handler for devicenetif_rx
Enable the PDA with MIPv6 support
Merge MIPL code into the embed version kernel
Enable applications
VoIP over MIPv6
VoIP + MIPv6 + WLAN or 802.16/20 ...
wireless home
MiPAQ project in Infonet,Lab
Hardware: IPAQ H3900
OS: Familiar linux
MIPv6: porting MIPL into Familiar Linux kernel
Testbed: One Home Network, Two wireless Foreign networks
Demo App: VLC video streaming
much research work done on this platform
MiPAQ testbed in Infonet Lab
Electronic Building-III, Room 317
index Background: get wireless What’s Mobile IPv6 WLAN, MIPv6 in Linux More interesting hot topics Conclusion & QA time
Fast handoverMNs move among different APs
MNs move between different access routers
MNs move between different wireless networks
some work are undergoing
tunnel based fast handover schemes
network control based schemes
Security issues
the nodes moves around the world
the related security issues?
IPSec is not possible for the whole Internet
authentication,authorization,accounting
Not coz extra-security problem from MIPv6
Enhance the wireless efficiency
TCP (and more) over wireless
IP/IPv6 + Mobility over wireless
headers are very longcompared with the short voice datahow to enhance the efficiency
one way: end the ip before the last wireless hopanother way: robust header compression
Power saving
Power is very important for mobile node
How to achieve high efficiency
device driver control
Power-saving routing schemes
Power-aware voice/video coding
...
And more...
Conclusion Background: get wireless What’s Mobile IPv6 WLAN, MIPv6 in Linux More interesting hot topics Conclusion & QA time
Conclusion
A brief review of wireless networking
IPv6 and Mobile IPv6: the concept
Set up a testbed using Linux
More topics introduced
Q&A Timereach me [email protected]
Thanks!