* [LARTC] Re: [HELP] Mutlicast over GRE tunnel (some minor fix on
@ 2006-09-11 3:16 Zhuang Yuyao
0 siblings, 0 replies; only message in thread
From: Zhuang Yuyao @ 2006-09-11 3:16 UTC (permalink / raw)
To: lartc
Zhuang Yuyao wrote:
> Hi,
>
> I got a problem similar to this one
> (http://mailman.ds9a.nl/pipermail/lartc/2005q4/017614.html), GRE
> tunnel can forward normal IP packets such as ICMP but failed to tunnel
> multicast traffics.
>
> Here's the setup:
>
> 192.168.20.0/24
> LAN-A--------------RtrA-------------RtrB--------------LAN-B
> 192.168.50.0/24 192.168.60.0/24
>
> RtrA interfaces:
> eth0 192.168.20.100
> eth1 192.168.50.1
>
> HOSTA in LAN-A
> eth0 192.168.50.250
>
> RtrB interfaces:
> eth0 192.168.20.98
> eth1 192.168.60.1
>
> HOSTB in LAN-B
> eth0 192.168.60.250
>
> Here is the setup script on RtrB:
>
> 1 #!/bin/sh
> 2
> 3 END_L\x192.168.20.98
> 4 END_R\x192.168.20.100
> 5 GRE_L\x10.0.0.4
> 6 GRE_R\x10.0.0.3
> 7 MGROUP"4.0.55.55
> 8 SUBNET_R\x192.168.50.0/24
> 9
> 10 /usr/sbin/iptables -F
> 11 /usr/sbin/iptables -F -t nat
> 12 /usr/sbin/iptables -P FORWARD ACCEPT
> 13
> 14 ip tunnel del gretun
> 15 ip tunnel add gretun mode gre remote $END_R local $END_L ttl 255
> 16 ip link set gretun up multicast on
> 17 ip addr add $GRE_L peer $GRE_R/24 dev gretun
> 18
> 19 ip route del $SUBNET_R via $GRE_R
> 20 ip route add $SUBNET_R via $GRE_R
> 21
> 22 /usr/sbin/smcroute -k
> 23 /usr/sbin/smcroute -d
> 24 sleep 3
> 25 /usr/sbin/smcroute -a eth1 192.168.60.250 $MGROUP gretun
> 26 /usr/sbin/smcroute -j gretun $MGROUP
>
> and the setup script on RtrA:
> 1 #!/bin/sh
> 2
> 3 END_L\x192.168.20.100
> 4 END_R\x192.168.20.98
> 5 GRE_L\x10.0.0.3
> 6 GRE_R\x10.0.0.4
> 7 MGROUP"4.0.55.55
> 8 SUBNET_R\x192.168.60.0/24
> 9
> 10 /usr/sbin/iptables -F
> 11 /usr/sbin/iptables -F -t nat
> 12 /usr/sbin/iptables -P FORWARD ACCEPT
> 13
> 14 ip tunnel del gretun
> 15 ip tunnel add gretun mode gre remote $END_R local $END_L ttl 255
> 16 ip link set gretun up multicast on
> 17 ip addr add $GRE_L peer $GRE_R/24 dev gretun
> 18
> 19 ip route del $SUBNET_R via $GRE_R
> 20 ip route add $SUBNET_R via $GRE_R
> 21
> 22 /usr/sbin/smcroute -k
> 23 /usr/sbin/smcroute -d
> 24 sleep 3
25 /usr/sbin/smcroute -a gretun 192.168.60.250 $MGROUP eth0
26 /usr/sbin/smcroute -j gretun $MGROUP
>
> On RtrB (while running #ping 192.168.50.250 on HOSTB):
> /usr/sbin/tcpdump -i eth0 -n
> 10:46:21.470623 IP 192.168.20.98 > 192.168.20.100: GREv0, length 88:
> IP 192.168.60.250 > 192.168.50.250: ICMP echo request, id 44558, seq
> 1, length 64
> 10:46:21.476843 IP 192.168.20.100 > 192.168.20.98: GREv0, length 88:
> IP 192.168.50.250 > 192.168.60.250: ICMP echo reply, id 44558, seq 1,
> length 64
> 10:46:22.487867 IP 192.168.20.98 > 192.168.20.100: GREv0, length 88:
> IP 192.168.60.250 > 192.168.50.250: ICMP echo request, id 44558, seq
> 2, length 64
> 10:46:22.491629 IP 192.168.20.100 > 192.168.20.98: GREv0, length 88:
> IP 192.168.50.250 > 192.168.60.250: ICMP echo reply, id 44558, seq 2,
> length 64
> 10:46:23.473064 IP 192.168.20.98 > 192.168.20.100: GREv0, length 88:
> IP 192.168.60.250 > 192.168.50.250: ICMP echo request, id 44558, seq
> 3, length 64
> 10:46:23.473711 IP 192.168.20.100 > 192.168.20.98: GREv0, length 88:
> IP 192.168.50.250 > 192.168.60.250: ICMP echo reply, id 44558, seq 3,
> length 64
> 10:46:24.452719 IP 192.168.20.98 > 192.168.20.100: GREv0, length 88:
> IP 192.168.60.250 > 192.168.50.250: ICMP echo request, id 44558, seq
> 4, length 64
> 10:46:24.453209 IP 192.168.20.100 > 192.168.20.98: GREv0, length 88:
> IP 192.168.50.250 > 192.168.60.250: ICMP echo reply, id 44558, seq 4,
> length 64
> 10:46:25.470861 IP 192.168.20.98 > 192.168.20.100: GREv0, length 88:
> IP 192.168.60.250 > 192.168.50.250: ICMP echo request, id 44558, seq
> 5, length 64
> 10:46:25.478632 IP 192.168.20.100 > 192.168.20.98: GREv0, length 88:
> IP 192.168.50.250 > 192.168.60.250: ICMP echo reply, id 44558, seq 5,
> length 64
>
> As you can see, the ICMP packets are encapsulated by GRE tunnel.
>
> Now I started to run multicast test by running "iperf -c 224.0.55.55
> -u -T 32 -t 1000 -i 1" on HOSTB
> On RtrB:
> /usr/sbin/tcpdump -i eth0 -n
> /usr/sbin/tcpdump -i gretun -n
> both captured nothing !!!
>
> I am really confused. Any help will be appreciated!
>
> Thanks very much!
>
> Best regards,
>
> Zhuang Yuyao
>
>
>
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2006-09-11 3:16 [LARTC] Re: [HELP] Mutlicast over GRE tunnel (some minor fix on Zhuang Yuyao
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