Linux kernel, wifi hack, security & Golang

今天在wikipedia看IGMP的时候，无意中发现了XORP, 简单适用了一下非常好用，并且官方的资料真理的比较全，使用也比较方便，还提供了一个基本的shell xorpsh 来配置管理信息。刚好可以省去买支持IGMP的路由器，支持IGMP的路由器最少也要1.5W…

XORP, or Extensible Open Router Platform, is an open source routing software suite, aimed at being both stable and fully featured enough for production use and also extensible to support networking research.

Request:
OS: ubuntu 9.04 (Linux Kernel 2.6.28-11-generic) with GCC 4.3.3
SW: XORP (multicast routing daemon)
HW: PC with 2 or 3 ethernet card (default gw is itself) !

Step 1: Check Linux Kernel Functions!
CONFIG_IP_MULTICAST=y
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_IP_MROUTE=y
After this configurations, the linux kernel support IGMP, DVMRP and MOSPF. If want support PIM-SM , do below settings
CONFIG_IP_PIMSM_V2=y
PS: you can use vi view /boot/CONFIG-(kernel version) to confirm !

Step 2: edit /etc/sysctl.conf to enable ip_forward
net.ipv4.conf.default.forwarding=1
PS: reboot or use command “sysctl -p” to enable !

Step 3: Install XORP(To compile XORP requires nearly 1.4GB of free disk space)
Step 3.1: Download xorp-1.6.tar.gz
Step 3.2: untar the xorp-1.6.tar.gz
Step 3.3: ./configure
Step 3.4: make
Step 3.4-1: make check (just to check)(it is not necessary)

Step 4: run  rtrmgr/xorp_rtrmgr  rtrmgr/xorpsh (A sample xorp command shell)
Step 4.1: create user group named “xorp”

sudo addgroup xorp

Step 4.2: cp or edit config.boot in xorp-1.6/rtrmgr/config.boot
config.boot for our environment

protocols {
fib2mrib {
disable: false
}
igmp {
disable: false
interface eth0 {
vif eth0 {
disable: false
version: 3
enable-ip-router-alert-option-check: false
query-interval: 125
query-last-member-interval: 1
query-response-interval: 10
robust-count: 2
}
}
}
}
fea {
unicast-forwarding4 {
disable: false
}
}
interfaces {
restore-original-config-on-shutdown: false
interface eth0 {
disable: false
discard: false
description: “”
default-system-config {
}
}
}

Step 4.3: xorp-1.6/rtrmgr/xorp_rtrmgr -b xorp-1.6/rtrmgr/config.boot

Step 5: Check Mrouter work OK
Step 5.1: Connect eth0 to VLC Player server PC and connect eth1 to VLC Player client PC
Step 5.2: Use VLC Player server PC run multicast streaming
Step 5.3: Use VLC Player client PC to play multicast streaming by multicast URL

Step6: run rtrmgr/xorpsh (A sample xorp command shell)

xorp-1.6$ rtrmgr/xorpsh
Welcome to XORP on wifihack

border@wifihack> show igmp ?
Possible completions:
group                Display information about IGMP group membership
interface            Display information about IGMP interfaces

border@wifihack> show igmp group
Interface    Group           Source          LastReported Timeout V State
eth0         224.0.0.2       0.0.0.0         192.168.1.134     240 3     E
eth0         224.0.0.22      0.0.0.0         192.168.1.134     240 3     E
eth0         224.0.0.251     0.0.0.0         192.168.1.134     232 3     E
eth0         224.0.0.252     0.0.0.0         192.168.1.30     232 3     E
eth0         239.255.255.250 0.0.0.0         192.168.1.104     240 3     E

参考:
1. http://www.linuxdiyf.com/bbs/redirect.php?fid=55&tid=69157&goto=nextnewset
2. http://www.xorp.org/getting_started.html
3. “User Manual” http://www.xorp.org/releases/current/docs/user_manual/user_manual.pdf
4. http://en.wikipedia.org/wiki/XORP
5. http://en.wikipedia.org/wiki/IGMP