[SBE] Questions about IP multicasting

Fri Dec 22 19:26:28 EST 2017

You said - There's a router at the transmit end, and a router and the receive end, but I have no idea how many routers all this traffic is passing through to get there.

“Routers” block UDP Multicast by default. Switches are not routers but can be taught a few tricks.

I'll have to give Wireshark a try.
Yes!  Set the input to filter the packets for your multicast ipaddr = = 239.xxx

I do not recommend using any multicast up in “239” land as other product use some of those ranges for their garbage. Simply move your multicast output address down to a value below… e.g. 238.xxx.xxx.xxx

As pointed out by others, if you are mixing control link and multicast traffic on the same STL link, then look into creating a GRE tunnel (VLAN tagging) if your terminating points will support it. Multicast will flood a VLAN with the exception when IGMP v3 is enabled between all the gear or with a “rendezvous point” or listener or in Cisco Speak, a “snooping querier”. A VLAN set to “PIM sparse” on any cisco or HP or DELL with enough horsepower to handle spanning tree will support all this good stuff.

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From: SBE [mailto:sbe-bounces at sbe.org] On Behalf Of Stu casteel
Sent: Friday, December 22, 2017 2:47 PM
To: 'sbe member discussion mail list' <sbe at sbe.org>
Subject: Re: [SBE] Questions about IP multicasting

Can you ping the source?

Stu
+1.707.972.0953
From: SBE [mailto:sbe-bounces at sbe.org] On Behalf Of Yengst, Curt
Sent: Friday, December 22, 2017 2:33 PM
To: sbe member discussion mail list <sbe at sbe.org<mailto:sbe at sbe.org>>
Subject: Re: [SBE] Questions about IP multicasting

There's a router at the transmit end, and a router and the receive end, but I have no idea how many routers all this traffic is passing through to get there.

I'll have to give Wireshark a try.

Curt Yengst, CSRE

Engineer

732-770-3054

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On Fri, Dec 22, 2017 at 5:30 PM, Stu casteel <stu at pacific.net<mailto:stu at pacific.net>> wrote:
How many routers/switches in the path?

Can you “see” the IP traffic? Use Wireshark with an open Netmask and a public address and “capture all” and see if the packets are there

Stu
+1.707.972.0953
From: SBE [mailto:sbe-bounces at sbe.org<mailto:sbe-bounces at sbe.org>] On Behalf Of Yengst, Curt
Sent: Friday, December 22, 2017 2:24 PM
To: sbe member discussion mail list <sbe at sbe.org<mailto:sbe at sbe.org>>
Subject: Re: [SBE] Questions about IP multicasting

That's just it.  I don't really know the correct answer to any of these except that I'm pretty sure the multicast address is in the correct range.  239.192.1.XXX.

The routers we have might not be up to the task since I can't seem to find anything in their interfaces for the join/leave requests you mentioned.

Curt Yengst, CSRE

Engineer

732-770-3054

Error! Filename not specified.

Star 99.1 Mission: To love, honor, and serve God, our listeners, supporters and staff. (Luke 10:27)
Star 99.1 / WAWZ(a service of Pillar of Fire, a not-for-profit, listener-supported 501-c-3 organization) has been serving families in the NJ/NY/PA area for over 80 years.

On Fri, Dec 22, 2017 at 5:15 PM, Stu casteel <stu at pacific.net<mailto:stu at pacific.net>> wrote:
Hi Curt,

Just a few that have got me in the past

IGMPv2 or IGMPv3?

Is the Multicast broadcast in the proper addressing range - are the routers configured to pass join/leave requests?  TTL value high enough to “make it there?”

Stu
+1.707.972.0953
From: SBE [mailto:sbe-bounces at sbe.org<mailto:sbe-bounces at sbe.org>] On Behalf Of Yengst, Curt
Sent: Friday, December 22, 2017 2:04 PM
To: sbe member discussion mail list <sbe at sbe.org<mailto:sbe at sbe.org>>
Subject: [SBE] Questions about IP multicasting

Working for a small independent TV station that is trying to set up an STL using TSoIP.  The catch is, they need to feed two separate devices at their tower site with the same TSoIP stream.  The short answer we got from the manufacturer of the ASI-to-TSoIP converter is to configure for IP multicast.

I did a rudimentary test with an ASI-to-TSoIP converter going to an ethernet switch and feeding a stream to a corresponding TSoIP-to-ASI converter and to a Sencore decoder with a TSoIP receiver card.  Naturally, that worked because all equipment was connected to the same physical switch.  But, now that I've moved the "receive" end to the transmitter site, I'm having a heap of trouble getting it to work.

Searching the web for all things multicast, I'm finding that this is easier said than done.  Has anyone out there in TV Land had any luck with what I'm trying to do?

Curt Yengst, CSRE

Engineer

732-770-3054

Error! Filename not specified.

Star 99.1 Mission: To love, honor, and serve God, our listeners, supporters and staff. (Luke 10:27)
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