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路由器模擬兩接口組播測試。

使用路由模擬兩個接口來測試，測試過程如下：

1、網絡拓補圖：

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2、PC機端測試工具（工具請到網上下載）

服務器端：Wsend.exe

客戶端：Wlisten.exe

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?3、路由器內核支持

???? 使用pimd方案還需要配置以下選項：

?查看路由器eth2和ra0接口是否支持組播。

#ifconfig

? 接口有UP BROADCAST RUNNING MULTICAST 為支持組播。

4、應用支持

??? (1)SDK源里的Igmpproxy應用配置選項：

? (2)Pimd應用：網上下載pimd-2.1.8.tar.bz2源碼，并移植到SDK源碼的應用里。

5、路由開啟組播轉發

?? 使用如下其中一種方案即可：

（1）使用igmpproxy代理

配置文件生成命令：#/bin/igmpproxy.sh eth2 ra0

執行后在/etc目錄下生成igmpproxy.conf配置文件，內容如下：

##------------------------------------------------------

## Enable Quickleave mode (Sends Leave instantly)

##------------------------------------------------------

quickleave

##------------------------------------------------------

## Configuration for eth0 (Upstream Interface)

##------------------------------------------------------

phyint eth2 upstream? ratelimit 0? threshold 1

altnet 0.0.0.0/0

##------------------------------------------------------

## Configuration for eth1 (Downstream Interface)

##------------------------------------------------------

phyint ra0 downstream? ratelimit 0? threshold 1

##------------------------------------------------------

## Configuration for eth2 (Disabled Interface)

##------------------------------------------------------

#phyint? disabled

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啟動進程：#igmpproxy &

（2）使用pimd

??? 在路由器系統/etc目錄下創建配置文件pimd.conf，配置文件/etc/pimd.conf內容如下：

#phyint de1 disable

phyint ra0 enable

phyint eth2 enable

# Smaller value means "higher" priority

cand_rp time 30 priority 20

# Bigger value means? "higher" priority

cand_bootstrap_router priority 5

# Static rendez-vous point

#rp_address 192.168.10.1 224.0.0.0 masklen 8 priority 5

# All multicast groups

group_prefix 224.0.0.0 masklen 4

#

switch_data_threshold????????? rate 50000 interval 20??? # 50kbps (approx.)

switch_register_threshold???? rate 50000 interval 20??? # 50kbps (approx.)

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啟動進程：#pimd -c /etc/pimd.conf -d &

路由器打印信息以下：

# ./pimd -c /etc/pimd.conf -d

debug level 0xffffffff (dvmrp_detail,dvmrp_prunes,dvmrp_routes,dvmrp_neighbors,dvmrp_timers,igmp_proto,igmp_timers,igmp_members,trace,timeout,packets,interfaces,kernel,cache,rsrr,pim_detail,pim_hello,pim_register,pim_join_prune,pim_bootstrap,pim_asserts,pim_cand_rp,pim_routes,pim_timers,pim_rpf)

01:03:41.552 pimd version 2.1.8 starting

01:03:41.555 Got 262144 byte send buffer size in 0 iterations

01:03:41.555 Got 262144 byte recv buffer size in 0 iterations

01:03:41.555 Got 262144 byte send buffer size in 0 iterations

01:03:41.556 Got 262144 byte recv buffer size in 0 iterations

01:03:41.559 Getting vifs from kernel

01:03:41.559 Installing eth2 (192.168.1.1 on subnet 192.168.1) as vif #0-2 - rate=0

01:03:41.560 Installing ra0 (192.168.2.1 on subnet 192.168.2) as vif #1-3 - rate=0

01:03:41.560 Installing br0 (192.168.0.1 on subnet 192.168) as vif #2-6 - rate=0

01:03:41.560 Getting vifs from ./pimd.conf

01:03:41.560 Local Cand-RP address is 192.168.2.1

01:03:41.561 Local Cand-RP priority is 20

01:03:41.561 Local Cand-RP advertisement period is 30 sec.

01:03:41.561 Local Cand-BSR address is 192.168.2.1

01:03:41.561 Local Cand-BSR priority is 5

01:03:41.561 Adding prefix 224.0.0.0/4

01:03:41.561 data_rate_limit is 50000 (bits/s)

01:03:41.561 data_rate_interval is 20 (seconds)

01:03:41.561 reg_rate_limit is 50000 (bits/s)

01:03:41.561 reg_rate_interval is 20 (seconds)

01:03:41.562 Interface eth2 comes up; vif #0 now in service

01:03:41.562 SENT IGMP Membership Query???? from 192.168.1.1???? to 224.0.0.1

01:03:41.563 SENT PIM v2 Hello????????????? from 192.168.1.1???? to 224.0.0.13

01:03:41.563 Interface ra0 comes up; vif #1 now in service

01:03:41.564 SENT IGMP Membership Query???? from 192.168.2.1???? to 224.0.0.1

01:03:41.564 SENT PIM v2 Hello????????????? from 192.168.2.1???? to 224.0.0.13

01:03:41.564 Interface br0 comes up; vif #2 now in service

01:03:41.565 SENT IGMP Membership Query???? from 192.168.0.1???? to 224.0.0.1

01:03:41.565 SENT PIM v2 Hello????????????? from 192.168.0.1???? to 224.0.0.13

01:03:41.567 Interface register_vif0 comes up; vif #3 now in service

Virtual Interface Table

?Vif? Local-Address??? Subnet?????????????? Thresh?? Flags????????? Neighbors

?? 0? 192.168.1.1???? ?192.168.1??????????? 1??????? DR NO-NBR

?? 1? 192.168.2.1????? 192.168.2??????????? 1??????? DR NO-NBR

?? 2? 192.168.0.1????? 192.168????????????? 1??????? DR NO-NBR

?? 3? 192.168.1.1????? register_vif0??????? 1

Multicast Routing Table

?Source????????? Group?????????? RP-addr???????? Flags

--------------------------(*,*,RP)--------------------------

Number of Groups: 0

Number of Cache MIRRORs: 0

01:03:42.301 create group entry, group 239.255.255.250

01:03:43.484 create group entry, group 239.255.255.250

Virtual Interface Table

?Vif? Local-Address??? Subnet?????????????? Thresh?? Flags????????? Neighbors

?? 0? 192.168.1.1????? 192.168.1??????????? 1??????? DR NO-NBR

?? 1? 192.168.2.1????? 192.168.2??????????? 1??????? DR NO-NBR

?? 2? 192.168.0.1????? 192.168????????????? 1??????? DR NO-NBR

?? 3? 192.168.1.1????? register_vif0??????? 1

Multicast Routing Table

?Source????????? Group?????????? RP-addr???????? Flags

--------------------------(*,*,RP)--------------------------

Number of Groups: 0

Number of Cache MIRRORs: 0

01:03:47.493 SENT PIM v2 Bootstrap????????? from 192.168.1.1???? to 224.0.0.13

01:03:47.493 SENT PIM v2 Bootstrap????????? from 192.168.2.1???? to 224.0.0.13

01:03:47.494 SENT PIM v2 Bootstrap????????? from 192.168.0.1???? to 224.0.0.13

---------------------------RP-Set----------------------------

Current BSR address: 192.168.2.1

RP-address????? Incoming?? Group prefix?? Priority?? Holdtime

^C01:03:48.608 pimd version 2.1.8 exiting

01:03:48.608 SENT PIM v2 Hello????????????? from 192.168.1.1???? to 224.0.0.13

01:03:48.609 SENT PIM v2 Hello????????????? from 192.168.2.1???? to 224.0.0.13

01:03:48.609 SENT PIM v2 Hello????????????? from 192.168.0.1???? to 224.0.0.13

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6、組播測試

PC1主機做為服務器端發送組播數據，PC2主機做客戶端接收組播數據。

（1）服務器端

抓PC1主機網絡接口發送的組播包：

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路由器后臺抓eth2接口收到的組播包：

# tcpdump -i eth2 udp

（2）客戶端

抓PC2主機網絡接口IP包：

加入組播組時向路由發送的igmp包：

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????? 接收到的組播數據包：

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路由器后臺tcpdump抓ra0接口的UDP包：

# tcpdump -i ra0 udp

?PC2主機Wlisten.exe工具加入組播組時路由器抓ra0接口的IGMP包：

PC2主機Wlisten.exe工具離開組播組時路由器抓ra0接口的IGMP包：

7、測試結果

結論：

（1）路由器內核在支持組播的環境，客戶端PC機需要加入組播組才能收到本接口內的服務器端PC機發送的組播數據，沒有應用程序轉發組播數據情況下本接口內PC機客戶端入加組播組后收不到其它接口PC機服務器端的發送的組播數據。

（2）路由器使用pimd方式或igmpproxy代理進行轉發，客戶端PC機需要加入組播群就能收到其它接口的服務器端PC機發送的組播數據。

（3）使用pimd方案沒有上下行接口之分，加入配置文件的兩個接口無論哪個接口做為組播服務器端/客戶端，路由器均可轉發組播數據。

（4）使用igmpproxy代理方案，只能上行接口下掛PC做為組播服務器端、下行接口下掛PC做為組播客戶端，路由器才轉發組播數據。

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