[Xorp-users] Multicast traffic is not forwarded in a specific deployment as mentioned in the mail
Igor Maravić
igorm at etf.rs
Thu Jul 5 07:32:40 PDT 2012
My bad... I forgot set protocols static part...
command in xorpsh is
#set protocols static interface-route 192.168.17.17/32 next-hop-interface eth3
#set protocols static interface-route 192.168.17.17/32 next-hop-vif eth3
If my theory is ok when you send packets from H1 to H2, they are
dropped in Linux.
You can confirm this if you run
netstat -s IP
and you see that number of discarded IP packets is increasing.
My proposals are for that case.
BR
Igor
2012/7/5 Reddy Ganesh-B38514 <B38514 at freescale.com>:
> Echo 0 > /proc/sys/net/ipv4/conf/eth3/rp_filter
> Echo 0 > /proc/sys/net/ipv4/conf/eth2/rp_filter
> Echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
>
> As per the step 1, I have Disabled the rp_filter on the Device. Still the problem persists.
>
> I tried to configure commands mentioned in step 2 also, But I could not locate the exact commands in xorp config shell. Did I miss anything ??
>
> -----Original Message-----
> From: Igor Maravić [mailto:igorm at etf.rs]
> Sent: Thursday, July 05, 2012 12:50 PM
> To: Ganesh Reddy K
> Cc: xorp-users at xorp.org; Bv Rajesh-B35907; nandakishoreie14 at gmail.com; Reddy Ganesh-B38514
> Subject: Re: [Xorp-users] Multicast traffic is not forwarded in a specific deployment as mentioned in the mail
>
> I'm 99% sure that this isn't Xorp problem :) Linux, won't forward packets if the src address in packet is unknown to him.
> So, at least I think that, you have 2 possible solutions:
> 1. Turn off rp filtering on Xorp box (reference -
> http://lartc.org/howto/lartc.kernel.html)
> 2. Set static interface route to 192.168.17.17/32 on eth3, with Xorp (
> interface-route 192.168.17.17/32 {
> next-hop-interface: "eth3"
> next-hop-vif: "eth3"
> }
> )
>
> Let me know if it worked. :)
> BR
> Igor
>
> 2012/7/5 Ganesh Reddy K <ganeshreddyk at gmail.com>:
>> Hi ,
>>
>> We are trying to exercise a multicast traffic forwarding scenario on
>> a powerPC device:--
>>
>> After H2 subscribed for the Group G1, The G1 multicast traffic is not
>> receiving at H2. But, when the H1 ip is in the same subnet, traffic
>> is properly forwarded to H2 without any issues.
>>
>> Test setup:--
>>
>> H1 ------------------------------------ eth3 XORP eth2
>> -------------------------------------------- H2
>>
>> 192.168.17.17 192.168.4.2 192.168.3.2
>> 192.168.3.10
>>
>> UDP-G1 multicaststream
>> Mcast listener for G1
>>
>> G1-239.7.7.7
>>
>>
>> 1) COnfigured XORP on the device, xorp.conf contents are .
>>
>> ===========XORP configuration ===========
>>
>> protocols {
>> fib2mrib {
>> }
>> igmp {
>>
>> interface eth0 {
>> vif eth0 {
>> version: 3
>> }
>> }
>> interface eth1 {
>> vif eth1 {
>> version: 3
>> }
>> }
>> interface eth2 {
>> vif eth2 {
>> version: 3
>> }
>> }
>> interface eth3 {
>>
>> vif eth3 {
>> version: 3
>> }
>> } }
>>
>>
>> pimsm4 {
>> interface eth0 {
>>
>> vif eth0 {
>> }
>> }
>> interface "register_vif" {
>> vif "register_vif" {
>> }
>>
>> }
>> interface eth1 {
>> vif eth1 {
>>
>> }
>> }
>> interface eth2 {
>> vif eth2 {
>> }
>> }
>> interface eth3 {
>>
>> vif eth3 {
>> }
>> }
>> }
>> }
>> fea {
>> unicast-forwarding4 {
>> }
>>
>>
>> unicast-forwarding6 {
>> }
>> }
>> interfaces {
>> interface eth0 {
>> vif eth0 {
>> }
>>
>> default-system-config {
>> }
>> }
>> interface eth1 {
>>
>> vif eth1 {
>> }
>> default-system-config {
>> }
>> }
>> interface eth2 {
>> vif eth2 {
>>
>> }
>> default-system-config {
>> }
>> }
>>
>> interface eth3 {
>> vif eth3 {
>> }
>>
>> default-system-config {
>> }
>> }
>> }
>> plumbing {
>>
>> mfea4 {
>> interface eth0 {
>> vif eth0 {
>>
>> }
>> }
>> interface "register_vif" {
>>
>> vif "register_vif" {
>> }
>> }
>>
>> interface eth1 {
>> vif eth1 {
>> }
>>
>> }
>>
>> interface eth2 {
>> vif eth2 {
>> }
>>
>> }
>> interface eth3 {
>> vif eth3 {
>>
>> }
>> }
>> }
>> }
>>
>> ============= xorp configuration =============
>>
>> 2) From H1, started sending UDP stream targeting G1 using VLC player.
>>
>> Capture of "tcpdump -ni eth3" on Device shows the UDP-G1 packets as
>> below ..
>> 09:27:50.081561 IP 192.168.17.17.4146 > 239.7.7.7.1234: UDP, length
>> 1328 ..
>>
>> 3) added a static route for the unknown network on Device (i.e route
>> add -net 192.168.17.17/32 dev eth3)
>>
>> 4) From H2, started VLC listener for the group G1.
>>
>> It is verified in the Device that, IGMP join is received.
>> capture of " show igmp group" on XORP console
>>
>> Interface Group Source LastReported Timeout V State
>>
>> eth0 224.0.0.2 0.0.0.0 192.168.1.2 223 3 E
>>
>> eth0 224.0.0.13 0.0.0.0 192.168.1.2 223 3 E
>>
>> eth0 224.0.0.22 0.0.0.0 192.168.1.2 223 3 E
>>
>> eth1 224.0.0.2 0.0.0.0 192.168.2.2 225 3 E
>>
>> eth1 224.0.0.13 0.0.0.0 192.168.2.2 225 3 E
>>
>> eth1 224.0.0.22 0.0.0.0 192.168.2.2 225 3 E
>>
>> eth2 224.0.0.2 0.0.0.0 192.168.3.2 231 3 E
>>
>> eth2 224.0.0.13 0.0.0.0 192.168.3.2 231 3 E
>>
>> eth2 224.0.0.22 0.0.0.0 192.168.3.2 231 3 E
>>
>> eth2 239.1.1.1 0.0.0.0 192.168.3.10 228 3 E
>>
>> eth2 239.7.7.7 0.0.0.0 192.168.3.10 228 3 E
>>
>> eth2 239.255.255.250 0.0.0.0 192.168.3.10 228 3 E
>>
>> eth3 224.0.0.2 0.0.0.0 192.168.4.2 230 3 E
>>
>> eth3 224.0.0.13 0.0.0.0 192.168.4.2 230 3 E
>>
>> eth3 224.0.0.22 0.0.0.0 192.168.4.2 230 3 E
>>
>> root at p4080ds>
>>
>> 5) But the traffic is not receiving at H2. Below is the statistics
>> related ip_mr on the device
>>
>> cat /proc/net/ip_mr*
>>
>> Group Origin Iif Pkts Bytes Wrong Oifs
>> EF070707 C0A81111 3 453 614268 0
>> Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote
>> 0 eth0 0 0 0 0 00000 C0A80102 00000000
>> 1 eth1 0 0 0 0 00000 C0A80202 00000000
>> 2 eth2 0 0 0 0 00000 C0A80302 00000000
>> 3 eth3 3971724 2929 0 0 00000 C0A80402 00000000
>> 4 pimreg 0 0 0 0 00004 C0A80102
>>
>>
>> 6) But, when the H1 ip is in the same subnet, traffic is properly
>> forwarded to H2 without any issues.
>>
>> Did anybody tried this scenario ?
>>
>> Thanks,
>> Ganesh
>>
>> _______________________________________________
>> Xorp-users mailing list
>> Xorp-users at xorp.org
>> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users
>
>
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