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—documentation:examples:multicast_with_pim-dm [2017/06/18 00:06] – external edit 127.0.0.1
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 +====== Multicast with PIM-DM ======
  
 +This lab show a multicast routing example using PIM Dense Mode.
 +
 +<note warning>
 +Broken: Debug in progress
 +</note>
 +===== Presentation =====
 +
 +==== Network diagram ====
 +
 +Here is the logical and physical view:
 +
 +{{:documentation:examples:labs.multicast-pim-dm.png|}}
 +
 +===== Setting-up the lab =====
 +
 +==== Downloading BSD Router Project images ====
 +
 +Download BSDRP serial image (prevent to have to use an X display) on Sourceforge.
 +
 +==== Download Lab scripts =====
 +
 +More information on these BSDRP lab scripts available on [[documentation:examples:How to build a BSDRP router lab]].
 +
 +Start the lab with 4 routers using emulated e1000 NIC (vtnet interfaces didn't support multicast-routing on FreeBSD):
 +<code>
 +tools/BSDRP-lab-bhyve.sh -i /usr/obj/BSDRP.amd64/BSDRP-1.702-full-amd64-serial.img.xz -n 4 -e
 +BSD Router Project (http://bsdrp.net) - bhyve full-meshed lab script
 +Setting-up a virtual lab with 4 VM(s):
 +- Working directory: /tmp/BSDRP
 +- Each VM have 1 core(s) and 256M RAM
 +- Emulated NIC: e1000
 +- Switch mode: bridge + tap
 +- 0 LAN(s) between all VM
 +- Full mesh Ethernet links between each VM
 +VM 1 have the following NIC:
 +- em0 connected to VM 2
 +- em1 connected to VM 3
 +- em2 connected to VM 4
 +VM 2 have the following NIC:
 +- em0 connected to VM 1
 +- em1 connected to VM 3
 +- em2 connected to VM 4
 +VM 3 have the following NIC:
 +- em0 connected to VM 1
 +- em1 connected to VM 2
 +- em2 connected to VM 4
 +VM 4 have the following NIC:
 +- em0 connected to VM 1
 +- em1 connected to VM 2
 +- em2 connected to VM 3
 +For connecting to VM'serial console, you can use:
 +- VM 1 : cu -l /dev/nmdm1B
 +- VM 2 : cu -l /dev/nmdm2B
 +- VM 3 : cu -l /dev/nmdm3B
 +- VM 4 : cu -l /dev/nmdm4B
 +</code>
 +
 +===== Routers configuration =====
 +
 +==== Router 1 ====
 +
 +Configurating, applying changes and saving configuration:
 +<code>
 +sysrc hostname=R1
 +sysrc gateway_enable=no
 +sysrc ipv6_gateway_enable=no
 +sysrc ifconfig_em0="inet 10.0.12.1/24"
 +sysrc defaultrouter="10.0.12.2"
 +hostname R1
 +service netif restart
 +service routing restart
 +config save
 +</code>
 +==== Router 2 ====
 +
 +<code>
 +sysrc hostname=R2
 +sysrc ifconfig_em0="inet 10.0.12.2/24"
 +sysrc ifconfig_em1="inet 10.0.23.2/24"
 +sysrc defaultrouter="10.0.23.3"
 +sysrc pimdd_enable=yes
 +cp /usr/local/etc/pimdd.conf.sample /usr/local/etc/pimd.conf
 +hostname R2
 +service netif restart
 +service routing restart
 +service pimdd start
 +config save
 +</code>
 +==== Router 3 ====
 +
 +<code>
 +sysrc hostname=R3
 +sysrc ifconfig_em1="inet 10.0.23.3/24"
 +sysrc ifconfig_em2="inet 10.0.34.3/24"
 +sysrc defaultrouter="10.0.23.2"
 +sysrc pimdd_enable=yes
 +cp /usr/local/etc/pimdd.conf.sample /usr/local/etc/pimd.conf
 +hostname R3
 +service netif restart
 +service routing restart
 +service pimdd start
 +config save
 +</code>
 +==== Router 4 ====
 +
 +<code>
 +sysrc hostname=R4
 +sysrc gateway_enable=NO
 +sysrc ipv6_gateway_enable=NO
 +sysrc ifconfig_em2="inet 10.0.34.4/24"
 +sysrc defaultrouter="10.0.34.3"
 +hostname R4
 +service netif restart
 +service routing restart
 +config save
 +</code>
 +
 +===== Checking pimdd behavior =====
 +
 +==== Generating VIF ====
 +
 +Does the pimdd had correctly generated VIF ?
 +
 +<code>
 +[root@R2]~# netstat -g
 +
 +IPv4 Virtual Interface Table
 + Vif   Thresh   Local-Address   Remote-Address    Pkts-In   Pkts-Out
 +  0         1   10.0.12.2                               0          0
 +  1         1   10.0.23.2                               0          0
 +
 +IPv4 Multicast Forwarding Table is empty
 +
 +
 +IPv6 Multicast Interface Table is empty
 +
 +IPv6 Multicast Forwarding Table is empty
 +</code>
 +
 +<code>
 +[root@R3]~# netstat -g
 +
 +IPv4 Virtual Interface Table
 + Vif   Thresh   Local-Address   Remote-Address    Pkts-In   Pkts-Out
 +  0         1   10.0.23.3                               0          0
 +  1         1   10.0.34.3                               0          0
 +
 +IPv4 Multicast Forwarding Table is empty
 +
 +
 +IPv6 Multicast Interface Table is empty
 +
 +IPv6 Multicast Forwarding Table is empty
 +</code>
 +
 +=> There are VIF for all PIM-DM enabled interface
 +
 +==== Does PIM daemon locally register to PIM mcast group ? ====
 +
 +PIM router need to register to 224.0.0.13 mcast group, check if all PIM routers correctly display this group on their enabled interfaces:
 +
 +<code>
 +[root@R2]~# ifmcstat
 +em0:
 +        inet 10.0.12.2
 +        igmpv2
 +                group 224.0.0.2 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:02
 +                group 224.0.0.13 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:0d
 +        inet6 fe80::a8aa:ff:fe00:212%em0 scopeid 0x1
 +        mldv2 flags=2<USEALLOW> rv 2 qi 125 qri 10 uri 3
 +                group ff01::1%em0 scopeid 0x1 mode exclude
 +                        mcast-macaddr 33:33:00:00:00:01
 +                group ff02::2:1124:9296%em0 scopeid 0x1 mode exclude
 +                        mcast-macaddr 33:33:11:24:92:96
 +                group ff02::2:ff11:2492%em0 scopeid 0x1 mode exclude
 +                        mcast-macaddr 33:33:ff:11:24:92
 +                group ff02::1%em0 scopeid 0x1 mode exclude
 +                        mcast-macaddr 33:33:00:00:00:01
 +                group ff02::1:ff00:212%em0 scopeid 0x1 mode exclude
 +                        mcast-macaddr 33:33:ff:00:02:12
 +        inet 10.0.12.2
 +        igmpv2
 +                group 224.0.0.1 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:01
 +em1:
 +        inet 10.0.23.2
 +        igmpv2
 +                group 224.0.0.2 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:02
 +                group 224.0.0.13 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:0d
 +        inet6 fe80::a8aa:ff:fe02:202%em1 scopeid 0x2
 +        mldv2 flags=2<USEALLOW> rv 2 qi 125 qri 10 uri 3
 +                group ff01::1%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:00:00:00:01
 +                group ff02::2:1124:9296%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:11:24:92:96
 +                group ff02::2:ff11:2492%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:ff:11:24:92
 +                group ff02::1%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:00:00:00:01
 +                group ff02::1:ff02:202%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:ff:02:02:02
 +        inet 10.0.23.2
 +        igmpv2
 +                group 224.0.0.1 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:01
 +</code>
 +
 +<code>
 +[root@R3]~# ifmcstat
 +em1:
 +        inet 10.0.23.3
 +        igmpv2
 +                group 224.0.0.2 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:02
 +                group 224.0.0.13 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:0d
 +        inet6 fe80::a8aa:ff:fe00:323%em1 scopeid 0x2
 +        mldv2 flags=2<USEALLOW> rv 2 qi 125 qri 10 uri 3
 +                group ff01::1%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:00:00:00:01
 +                group ff02::2:1124:9296%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:11:24:92:96
 +                group ff02::2:ff11:2492%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:ff:11:24:92
 +                group ff02::1%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:00:00:00:01
 +                group ff02::1:ff00:323%em1 scopeid 0x2 mode exclude
 +                        mcast-macaddr 33:33:ff:00:03:23
 +        inet 10.0.23.3
 +        igmpv2
 +                group 224.0.0.1 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:01
 +em2:
 +        inet 10.0.34.3
 +        igmpv2
 +                group 224.0.0.2 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:02
 +                group 224.0.0.13 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:0d
 +        inet6 fe80::a8aa:ff:fe03:303%em2 scopeid 0x3
 +        mldv2 flags=2<USEALLOW> rv 2 qi 125 qri 10 uri 3
 +                group ff01::1%em2 scopeid 0x3 mode exclude
 +                        mcast-macaddr 33:33:00:00:00:01
 +                group ff02::2:1124:9296%em2 scopeid 0x3 mode exclude
 +                        mcast-macaddr 33:33:11:24:92:96
 +                group ff02::2:ff11:2492%em2 scopeid 0x3 mode exclude
 +                        mcast-macaddr 33:33:ff:11:24:92
 +                group ff02::1%em2 scopeid 0x3 mode exclude
 +                        mcast-macaddr 33:33:00:00:00:01
 +                group ff02::1:ff03:303%em2 scopeid 0x3 mode exclude
 +                        mcast-macaddr 33:33:ff:03:03:03
 +        inet 10.0.34.3
 +        igmpv2
 +                group 224.0.0.1 mode exclude
 +                        mcast-macaddr 01:00:5e:00:00:01
 +</code>
 +
 +We correctly sees mcast group 224.0.0.13 subscribed on PIM enabled interfaces.
 +
 +===== Testing =====
 +
 +==== Enable IPerf server on R4 (mcast receiver) ====
 +
 +This IPerf server will listen the 239.1.1.1 multicast group
 +<code>
 +[root@R4]~# iperf -s -u -B 239.1.1.1 -i 1
 +------------------------------------------------------------
 +Server listening on UDP port 5001
 +Binding to local address 239.1.1.1
 +Joining multicast group  239.1.1.1
 +Receiving 1470 byte datagrams
 +UDP buffer size: 41.1 KByte (default)
 +------------------------------------------------------------
 +
 +</code>
 +
 +
 +==== IPerf client on R1 (mcast sender) ====
 +
 +Start an iperf client to 239.1.1.1.
 +
 +<code>
 +[root@R1]~# iperf -c 239.1.1.1 -u -T 32 -t 300 -i 1
 +------------------------------------------------------------
 +Client connecting to 239.1.1.1, UDP port 5001
 +Sending 1470 byte datagrams
 +Setting multicast TTL to 32
 +UDP buffer size: 9.00 KByte (default)
 +------------------------------------------------------------
 +[  3] local 10.0.12.1 port 34390 connected with 239.1.1.1 port 5001
 +[ ID] Interval       Transfer     Bandwidth
 +[  3]  0.0- 1.0 sec   128 KBytes  1.05 Mbits/sec
 +[  3]  1.0- 2.0 sec   128 KBytes  1.05 Mbits/sec
 +[  3]  2.0- 3.0 sec   128 KBytes  1.05 Mbits/sec
 +[  3]  0.0- 3.0 sec   385 KBytes  1.05 Mbits/sec
 +[  3] Sent 268 datagrams
 +</code>
 +
 +Now check than R4 receive the iperf trafic send by R1:
 +
 +<code>
 +Nothing !?
 +</code>
 +
 +==== Troubleshooting ====
 +
 +=== Multicast table on R2 ===
 +
 +What's the status of multicast table of the first router:
 +<code>
 +[root@router]~# netstat -g
 +
 +IPv4 Virtual Interface Table
 + Vif   Thresh   Local-Address   Remote-Address    Pkts-In   Pkts-Out
 +  0         1   10.0.12.2                            2799          0
 +  1         1   10.0.23.2                               0          0
 +
 +IPv4 Multicast Forwarding Table
 + Origin          Group             Packets In-Vif  Out-Vifs:Ttls
 + 10.0.12.1       239.1.1.1            2799    0
 +
 +
 +IPv6 Multicast Interface Table is empty
 +
 +IPv6 Multicast Forwarding Table is empty
 +</code>
 +
 +=> it correctly detect a multicast source comming from VIF 0 (em0) but didn't forward packet toward R3: Why ?
 +
 +=== Using R3 as a subscriber ===
 +
 +Starting an iperf receiver on R3 and check if it received mcast traffic by re-starting ipferf on R1.
 +
 +Status of mcast routing table on R2:
 +
 +<code>
 +[root@R2]~# netstat -g
 +
 +IPv4 Virtual Interface Table
 + Vif   Thresh   Local-Address   Remote-Address    Pkts-In   Pkts-Out
 +  0         1   10.0.12.2                            5516          0
 +  1         1   10.0.23.2                               0        162
 +
 +IPv4 Multicast Forwarding Table
 + Origin          Group             Packets In-Vif  Out-Vifs:Ttls
 + 10.0.12.1       239.1.1.1             162    0    1:1
 +
 +
 +IPv6 Multicast Interface Table is empty
 +
 +IPv6 Multicast Forwarding Table is empty
 +</code>
 +
 +=> R2 correctly received AND forward mcast traffic from VIF0 (em0) to VIF1 (em1)
 +
 +and R3 correctly receive mcast traffic:
 +<code>
 +------------------------------------------------------------
 +[  3] local 239.1.1.1 port 5001 connected with 10.0.12.1 port 11166
 +[ ID] Interval       Transfer     Bandwidth        Jitter   Lost/Total Datagrams
 +[  3]  0.0- 1.0 sec   128 KBytes  1.05 Mbits/sec   0.175 ms    0/   89 (0%)
 +[  3]  1.0- 2.0 sec   128 KBytes  1.05 Mbits/sec   0.251 ms    0/   89 (0%)
 +[  3]  2.0- 3.0 sec   128 KBytes  1.05 Mbits/sec   0.189 ms    0/   89 (0%)
 +[  3]  3.0- 4.0 sec   128 KBytes  1.05 Mbits/sec   0.165 ms    0/   89 (0%)
 +[  3]  4.0- 5.0 sec   128 KBytes  1.05 Mbits/sec   0.268 ms    0/   89 (0%)
 +[  3]  5.0- 6.0 sec   128 KBytes  1.05 Mbits/sec   0.243 ms    0/   89 (0%)
 +[  3]  6.0- 7.0 sec   129 KBytes  1.06 Mbits/sec   0.199 ms    0/   90 (0%)
 +[  3]  7.0- 8.0 sec   128 KBytes  1.05 Mbits/sec   0.187 ms    0/   89 (0%)
 +</code>
 +
 +=> Need to found why R2 didn't forward traffic to a next-hop-PIM router.
 +
 +To dig, error on R2 pimd daemon:
 +<code>
 +Jun  7 09:22:48 router pimdd[1483]: warning - sendto from 10.0.12.2 to 224.0.0.13: Invalid argument
 +Jun  7 09:22:48 router pimdd[1483]: warning - sendto from 10.0.23.2 to 224.0.0.13: Invalid argument
 +Jun  7 09:23:07 router pimdd[1483]: warning - received packet from 10.0.23.3 shorter (48 bytes) than hdr+data length (24+12264)
 +Jun  7 09:23:07 router pimdd[1483]: warning - received packet from 10.0.23.3 shorter (48 bytes) than hdr+data length (24+12264)
 +Jun  7 09:23:17 router pimdd[1483]: warning - sendto from 10.0.12.2 to 224.0.0.13: Invalid argument
 +Jun  7 09:23:17 router pimdd[1483]: warning - sendto from 10.0.23.2 to 224.0.0.13: Invalid argument
 +</code>
 +
 +This problem is linked to the [[https://wiki.freebsd.org/SOCK_RAW|FreeBSD SOCK_RAW recent changes]].
documentation/examples/multicast_with_pim-dm.txt · Last modified: 2019/11/06 09:20 by olivier
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