RE: igmp join and ping

Hello Mustafa,

In my experience Cisco routers respond to pings using as a source address
the IP address of the interface that the echo request arrived on. So I
would expect the reply to come from an external interface, not a loopback
address.

HTH,

Bob Sinclair CCIE 10427 CCSI 30427
CIERS2 Online Instructor
www.tinyurl.com/ciers2online

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Mustafa Yadav
> Sent: Sunday, August 22, 2010 3:11 PM
> To: Cisco certification
> Subject: igmp join and ping
>
> hi
>
>
> I have a question relevant to igmp.As shown bleow I configured vlan
> 783 for
> igmp group 228.28.28.28.And then from the source ping 228.28.28.28
> .Instead
> of vlna 783 ip address another interface f1/1 ip address has answered
> that
> ping.Do i know something wrong?As far as I know only igmp join
> configred
> interfaces have to asnwer that ping.
>
> RSRack1R6#ping 228.28.28.28
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 228.28.28.28, timeout is 2 seconds:
>
> Reply to request 0 from 132.1.17.7, 740 ms
>
>
>
> RSRack1SW1# sh ip igmp groups
> IGMP Connected Group Membership
> Group Address Interface Uptime Expires Last
> Reporter
> 228.28.28.28 Vlan783 00:35:30 00:02:39
> 204.12.1.7
> 224.0.1.40 FastEthernet1/1 00:36:43 00:02:29
> 132.1.17.7
> RSRack1SW1#sh run int vl
> RSRack1SW1#sh run int vlan 783
> Building configuration...
>
> Current configuration : 115 bytes
> !
> interface Vlan783
> ip address 204.12.1.7 255.255.255.0
> ip pim sparse-mode
> ip igmp join-group 228.28.28.28
> end
>
> RSRack1SW1#sh run int f1/1
> Building configuration...
>
> Current configuration : 105 bytes
> !
> interface FastEthernet1/1
> no switchport
> ip address 132.1.17.7 255.255.255.0
> ip pim sparse-mode
> end
>
> RSRack1SW1#
>
>
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Received on Sun Aug 22 2010 - 15:36:34 ART