FOG Multicasting speed drops to zero

[mashina]

Hi everyone,

I have three rooms, each containing several identical computers. These rooms are all on the same VLAN, connected across multiple switches without any router in between. Multicasting works successfully in one of the rooms where I have two test computers. However, in the other rooms with more computers, the multicast starts fine but drops to zero speed at around 80% completion, causing FOG to disconnect the clients. Our IT department informed me that IGMP snooping is enabled on the switches. Does anyone have suggestions on what I should do?

Thanks!

Here are the multicasting logs from FOG:

[09-05-24 12:23:01 pm] Task started
Udp-sender 20200328
Using mcast address 236.28.1.80
UDP sender for /images/Peruswin30052024/d1p1.img at 172.28.1.80 on ens18
Broadcasting control to 224.0.0.1
New connection from 172.28.171.152  (#0) 00000009
New connection from 172.28.172.246  (#1) 00000009
New connection from 172.28.171.93  (#2) 00000009
New connection from 172.28.171.248  (#3) 00000009
Starting transfer: 00000009
bytes= 31 988 620  re-xmits=0000000 (  0.0%) slice=0112 -   0
Transfer complete.
Disconnecting #0 (172.28.171.152)
Disconnecting #1 (172.28.172.246)
Disconnecting #2 (172.28.171.93)
Disconnecting #3 (172.28.171.248)

Udp-sender 20200328
Using mcast address 236.28.1.80
UDP sender for /images/Peruswin30052024/d1p2.img at 172.28.1.80 on ens18
Broadcasting control to 224.0.0.1
New connection from 172.28.171.93  (#0) 00000009
New connection from 172.28.171.152  (#1) 00000009
New connection from 172.28.172.246  (#2) 00000009
New connection from 172.28.171.248  (#3) 00000009
Starting transfer: 00000009
bytes=          754  re-xmits=0000000 (  0.0%) slice=0112 -   0
Transfer complete.
Disconnecting #0 (172.28.171.93)
Disconnecting #1 (172.28.171.152)
Disconnecting #2 (172.28.172.246)
Disconnecting #3 (172.28.171.248)

Udp-sender 20200328
Using mcast address 236.28.1.80
UDP sender for /images/Peruswin30052024/d1p3.img at 172.28.1.80 on ens18
Broadcasting control to 224.0.0.1
New connection from 172.28.171.152  (#0) 00000009
New connection from 172.28.172.246  (#1) 00000009
New connection from 172.28.171.93  (#2) 00000009
New connection from 172.28.171.248  (#3) 00000009
Starting transfer: 00000009
bytes=383 545 344  re-xmits=0003052 (  1.1%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=260
bytes=  1 096 595K re-xmits=0006569 (  0.8%) slice=0112 -   32
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=143
bytes=  1 128 445K re-xmits=0006610 (  0.8%) slice=0112 -   3
Timeout notAnswered=[1] notReady=[1] nrAns=3 nrRead=3 nrPart=4 avg=343
Timeout notAnswered=[1] notReady=[1] nrAns=3 nrRead=3 nrPart=4 avg=497
bytes=  1 238 487K re-xmits=0007656 (  0.8%) slice=0112 -   3
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=576
bytes=  1 302 505K re-xmits=0009546 (  1.0%) slice=0112 -   3
Timeout notAnswered=[1] notReady=[1] nrAns=3 nrRead=3 nrPart=4 avg=402
bytes=  1 567 179K re-xmits=0010179 (  0.9%) slice=0112 -   3
Timeout notAnswered=[2,3] notReady=[2,3] nrAns=2 nrRead=2 nrPart=4 avg=824
bytes=  3 664 342K re-xmits=0017061 (  0.6%) slice=0112 -   1
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=1792
bytes=  4 463 299K re-xmits=0019621 (  0.6%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=599
bytes=  4 563 468K re-xmits=0020107 (  0.6%) slice=0112 -   2
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=641
bytes=  4 778 296K re-xmits=0020577 (  0.6%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=119
bytes=  5 007 297K re-xmits=0020734 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=485
bytes=  6 070 450K re-xmits=0023146 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0] notReady=[0] nrAns=3 nrRead=3 nrPart=4 avg=613
bytes=  6 260 436K re-xmits=0023887 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=508
bytes=  6 444 369K re-xmits=0024305 (  0.5%) slice=0112 -   2
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=443
bytes=  6 847 431K re-xmits=0026738 (  0.5%) slice=0112 -   1
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=410
bytes=  6 978 812K re-xmits=0027410 (  0.5%) slice=0112 -   0
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=345
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=483
bytes=  7 469 939K re-xmits=0030905 (  0.5%) slice=0112 -   0
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=458
bytes=  8 012 982K re-xmits=0031040 (  0.5%) slice=0112 -   2
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=730
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=609
bytes=  8 057 413K re-xmits=0031341 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=416
bytes=  8 325 590K re-xmits=0031799 (  0.5%) slice=0112 -   0
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=277
bytes=  8 393 430K re-xmits=0031799 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=432
bytes=  9 791 645K re-xmits=0038831 (  0.5%) slice=0112 -   3
Timeout notAnswered=[1] notReady=[1] nrAns=3 nrRead=3 nrPart=4 avg=515
bytes= 10 154 417K re-xmits=0040422 (  0.5%) slice=0112 -   3
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=275
bytes= 10 450 781K re-xmits=0041730 (  0.5%) slice=0112 -   0
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=476
bytes= 10 521 966K re-xmits=0041866 (  0.5%) slice=0112 -   0
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=665
bytes= 10 534 387K re-xmits=0043371 (  0.5%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=819
bytes= 10 592 832K re-xmits=0044592 (  0.5%) slice=0112 -   0
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=449
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=511
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=553
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=557
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=618
bytes= 10 723 895K re-xmits=0048043 (  0.6%) slice=0112 -   0
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=400
bytes= 11 625 887K re-xmits=0051194 (  0.6%) slice=0112 -   1
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=538
bytes= 13 114 237K re-xmits=0060619 (  0.6%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=723
bytes= 13 680 212K re-xmits=0064918 (  0.6%) slice=0112 -   0
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=504
bytes= 13 875 452K re-xmits=0065742 (  0.6%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=305
bytes= 14 137 100K re-xmits=0066021 (  0.6%) slice=0112 -   2
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=391
bytes= 14 524 077K re-xmits=0068797 (  0.6%) slice=0112 -   2
Timeout notAnswered=[1,3] notReady=[1,3] nrAns=2 nrRead=2 nrPart=4 avg=628
bytes= 14 555 450K re-xmits=0070761 (  0.6%) slice=0112 -   0
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=500
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=560
bytes= 14 660 395K re-xmits=0071438 (  0.6%) slice=0112 -   3
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=668
bytes= 14 773 463K re-xmits=0073978 (  0.7%) slice=0112 -   3
Timeout notAnswered=[2] notReady=[2] nrAns=3 nrRead=3 nrPart=4 avg=1196
bytes= 15 564 139K re-xmits=0076526 (  0.6%) slice=0112 -   0
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=265
bytes= 15 714 630K re-xmits=0076972 (  0.6%) slice=0112 -   3
Timeout notAnswered=[0,1,2,3] notReady=[0,1,2,3] nrAns=0 nrRead=0 nrPart=4 avg=509
bytes= 15 937 899K re-xmits=0077055 (  0.6%) slice=0112 -   0
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Timeout notAnswered=[3] notReady=[3] nrAns=3 nrRead=3 nrPart=4 avg=665
Dropping client #3 because of timeout
Disconnecting #3 (172.28.171.248)
bytes= 15 955 894K re-xmits=0077055 (  0.6%) slice=0112 -   1
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Timeout notAnswered=[0,1,2] notReady=[0,1,2] nrAns=0 nrRead=0 nrPart=3 avg=665
Dropping client #0 because of timeout
Disconnecting #0 (172.28.171.152)
Dropping client #1 because of timeout
Disconnecting #1 (172.28.172.246)
Dropping client #2 because of timeout
Disconnecting #2 (172.28.171.93)
bytes= 15 955 894K re-xmits=0077055 (  0.6%) slice=0112 -   1
Transfer complete.

Udp-sender 20200328
Using mcast address 236.28.1.80
UDP sender for /images/Peruswin30052024/d1p4.img at 172.28.1.80 on ens18
Broadcasting control to 224.0.0.1