pinging half of my network hosts !!!

hello all,

the last days i have a very strange problem…

MyNet-A, running dhcp for all computers… Routerboard has 3 active interfaces, gw-1, gw-2 and localnet
default gateway is gw-1
i route statically, all 10.0.0.0/8 and 192.168.0.0/16 to gw-2
Gw-2 connects to Mynet-B, Mynet-B connects wireless with Mynet-C and via a bonding interface i end to Mynet-D

from Mynet-D router, 3 hops away from gw-2, i can ping some hosts in my localnet..
results are going to make me crazy…
i can ping .1 (my local mt router)
.3 an openmediavault file server
.4 a rpi3 running libreelec
.12-.16 voip phones
I cannot ping .20 to .25 some windows pcs and a mac
I cannot ping .40 to .42 my mobile phones
I can ping .70 and .100 a printer and a Time Capsule device
I change .24 (windows 7) to .101, i can ping it..
i revert it to .24, i cannot…
i can ping .110, a WD nas disk…

when i run Ip scan on Mynet-D router, it can detect 9 hosts.
when i run Ip scan on Mynet-C, Mynet-B, Mynet-A router, they can detect 14 hosts.

ok.. its 4 o clock am here, but this is really strange…
Mynet-A router is freshly installed…

ip scan from a mid-way router…
Screen Shot 2018-01-21 at 03.54.58.png
ip scan from last router..
Screen Shot 2018-01-21 at 03.56.32.png

ok, lets take another look…

Mynet-A RouterBOARD 750G r3
is connected to the next router via ethernet cable. Mynet-A has 16 pingable devices, including computers, phones, etc..

Mynet-B 960PGS
is connected to the next router via wireless. Can ping all 16 pingable devices, from Mynet-A

Mynet-C CRS125-24G-1S
is connected to the next router via a bonding interface on 4 EoIP channels. Can ping all 16 pingable devices, from Mynet-A

Mynet-D CHR
on the cloud, can ping only 8/16 devices. Cannot ping computers and mobile phones. Can ping voip phones, nas hard disks, printers, etc..

so, what the heck ?
i changed ips on mynet-A, i could ping the computers for a few hours, then no..

Are you using anything other than arp=enabled on your ethernet interfaces? Sorry if I missed something…

in every interface, in every router, arp=enabled :slight_smile:

Can someone from the Mikrotik team take a look, please ?

Mynet-A RouterBOARD 750G r3
2 R ether3-Switch 1500 64:D1:54:BE:4E:73 enabled switch1 (localnet)
3 R ether4-GW-Anel 1500 64:D1:54:BE:4E:74 enabled switch1

Mynet-B 960PGS
0 R eth1-LGS 1500 64:D1:54:BB:56:74 enabled switch1
1 R eth2-Anel 1500 64:D1:54:BB:56:75 enabled switch1

Mynet-C CRS125-24G-1S
17 RS ;;; Roof-1
eth21-roof1 1500 4C:5E:0C:97:E7:80 enabled eth5-procurve switch1
0 R name=“bonding2VPN” mtu=1500 mac-address=FE:72:48:23:30:52 arp=enabled arp-timeout=auto
slaves=eoip-tunnel11,eoip-tunnel12,eoip-tunnel13,eoip-tunnel14 mode=balance-rr
primary=none link-monitoring=arp arp-interval=100ms arp-ip-targets=10.122.87.150
mii-interval=100ms down-delay=0ms up-delay=0ms lacp-rate=30secs
transmit-hash-policy=layer-2 min-links=0

Mynet-D CHR
0 R name=“bonding2Anel” mtu=1500 mac-address=FE:43:A8:9F:46:79 arp=enabled arp-timeout=auto
slaves=eoip-tunnel12,eoip-tunnel14,eoip-tunnel11,eoip-tunnel13 mode=balance-rr
primary=none link-monitoring=arp arp-interval=100ms arp-ip-targets=10.122.87.149
mii-interval=100ms down-delay=0ms up-delay=0ms lacp-rate=30secs
transmit-hash-policy=layer-2 min-links=0