Chromecast multicast not working in builds from Oct 20th on

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PeterMeyer
DD-WRT Novice


Joined: 16 Dec 2017
Posts: 1

PostPosted: Sat Dec 16, 2017 16:15    Post subject: Chromecast multicast not working in builds from Oct 20th on Reply with quote
Hi:

I read a number of mixed success and failure accounts regarding getting a Chromecast to be seen by either PC or mobile apps routed using either a LEDE or DD-WRT system. Having tried pretty much all the suggests on both the lede and dd sites (for the two respective router builds), I am more and more convinced that something was introduced into the kernel code between Oct20th and Oct 25th, 2017 that has fundamentally broken multicast routing on bridged networks (mixed 2.5G, 5G, and lan). What would be the best way to track the difference in the code submitted between those two times.

The one other possibility, might be that the way that bridging is implemented on a Linksys WRT3200ACM is unique which may explain other people's success in getting the cast to work.

Does anyone have any thoughts on how to proceed? Would it make sense for to try and install a Oct20th build and see if it works (what are the risks in trying to downgrade?) Is it possible to see the source code tree and look at the changes from Oct 20th onward?

Many thanks!

Peter
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mrjcd
DD-WRT Guru


Joined: 31 Jan 2015
Posts: 4568
Location: Texas

PostPosted: Sat Dec 16, 2017 22:38    Post subject: Reply with quote
I use a couple chromecast and they work just fine.
Both are connected to 2.4 isolated guest network which is actually bridged via br1 with the 5GHz VAP and also 1 wired VLAN port.
Can control them from 2.4 or 5 GHz guest networks without a problem.

This all works well on the EA8500
but also works with exact same setup on the WNDR3700v4 I'm forced to swap in as a backup when I do some fool upgrade that blows up my main router

and yea the chromycast have worked fine for me with dd-wrt for couple years now .... many many different builds --- running latest ATM.

Might be a marvell thing ??? ----I think some have also had chromycast troubles with brcm routers....
I use the other brand Cool

oh yea the iphone or android devives work just fine to control them --- never tried from a PC --- that is why they are on the guest network... to keep the lil devils away from me ... although I've been known to connect the droidturbo to a guest network just to kill out some netflix or hulu show running nonstop after someone falls asleep with with it running Twisted Evil
Vaako
DD-WRT User


Joined: 10 Jun 2009
Posts: 313

PostPosted: Thu Dec 21, 2017 12:00    Post subject: Reply with quote
I can confirm that newer builds from Oct 20 (10-20-2017-r33555) indeed brick chromecast functionality.

I have downgraded to DD-WRT v3.0-r33525 mega (10/17/17) and chromecast is working again.

This on a Linksys E4200

_________________
Regards,
Vaako

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1x Ubiquiti RouterStation Pro DD-WRT r23204 std (12/24/13)
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d0ug
DD-WRT Guru


Joined: 31 Jul 2015
Posts: 724

PostPosted: Fri Dec 22, 2017 21:49    Post subject: Reply with quote
Vaako wrote:
I can confirm that newer builds from Oct 20 (10-20-2017-r33555) indeed brick chromecast functionality.

I have downgraded to DD-WRT v3.0-r33525 mega (10/17/17) and chromecast is working again.

This on a Linksys E4200


This may be an issue with specific routers then. I have 3 Google Home minis, and 3 Chromecast 1st gen working fine with r34080 on Linksys WRT1200AC.

I have no issues casting from my phone, doing grouped speakers with the google homes, or controlling media on the chromecasts with the google homes.
thunderhead
DD-WRT User


Joined: 11 Nov 2017
Posts: 133

PostPosted: Fri Dec 22, 2017 23:08    Post subject: Reply with quote
Agreed. Another example (perhaps the OP already knew about it): https://www.dd-wrt.com/phpBB2/viewtopic.php?t=312595
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*3x R7000 on DD-WRT v3.0-r36070M kongac (05/31/2018) both radios on/primary router.
*1x R7000 on DD-WRT v3.0-r39575M kongac (04/20/2019) both radios disabled configured as a switch.
*R7800 on OpenWRT 18.06.2
alphax
DD-WRT Novice


Joined: 10 Jun 2008
Posts: 4

PostPosted: Wed Dec 27, 2017 9:55    Post subject: Reply with quote
Running on Linksys E3000

Not sure which build to use
33607 due to the KRACK vulnerability for the Broadcom fix
but this makes it so I can't see my Chromecast...

while the
r33555 seem to be working (need to test this still).

help~
RobTheGob
DD-WRT Novice


Joined: 03 Jan 2018
Posts: 8

PostPosted: Wed Jan 03, 2018 17:37    Post subject: Reply with quote
I'm running three E4200's on DD-WRT v3.0-r33986 mega (12/04/17) and having issues with Chromecast v1 and v2.

I updated to r33986 to avoid KRACK, but it took a bit before we realized there were issues with casting. I'm also having intermittent issues with Apple AirPrint - but I'm not sure if it's related or not...

I'm also trying to determine if there's a viable version to try...

I have several E3000's that I could try - but the other replies appear to indicate that wouldn't help.
alphax
DD-WRT Novice


Joined: 10 Jun 2008
Posts: 4

PostPosted: Wed Jan 03, 2018 19:03    Post subject: Reply with quote
yeah looks like that built is broke...

I was trying different built that got me into a bad flash state, will need to wait for JTAG cable to fix it...
RobTheGob
DD-WRT Novice


Joined: 03 Jan 2018
Posts: 8

PostPosted: Wed Jan 17, 2018 23:23    Post subject: Reply with quote
FYI - I rolled my three E4200's back to:

dd-wrt.v24-33525_NEWD-2_K3.x_mega-e4200.bin

And they've been working great ever since.
crowrt
DD-WRT Novice


Joined: 17 Jan 2018
Posts: 5

PostPosted: Fri Jan 19, 2018 22:00    Post subject: Re: Chromecast multicast not working in builds from Oct 20th Reply with quote
PeterMeyer wrote:
Hi:

I read a number of mixed success and failure accounts regarding getting a Chromecast to be seen by either PC or mobile apps routed using either a LEDE or DD-WRT system.

Peter


Can anyone else confirm that LEDE is affected too? My next step was to try 17.04. I want something that fixes KRACK but doesn't break my CC functionality.

Thanks
johnlee285706
DD-WRT Novice


Joined: 19 Jun 2019
Posts: 2

PostPosted: Wed Jun 19, 2019 21:25    Post subject: Reply with quote
I have 2 Asus RT-N16, which has Broadcom BCM4716 chip rev 1. Have two multicast devices at home, one smart TV, one Wireless speaker. After upgraded, downgraded at least 3 versions in the past few days, I can confirm multicast didn't work on "DD-WRT v3.0-r40048 big (06/16/19)" and "DD-WRT v3.0-r36527 big (08/09/18)", but it worked on "DD-WRT v3.0-r33525 big (10/17/17)".

With ""DD-WRT v3.0-r40048 big (06/16/19)", after upgraded with factory defaults, multicast worked. After set the wireless security to WPA2 Personal with AES, it didn't work.
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