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ARP entries via a 802.1q trunk link

Thu Aug 31, 2017 3:12 pm

Hello to the community,

I have a hEX RB750Gr3 with RouterOS v6.39.1 in an enterprise environment, for 50-60 concurrent mobile devices, with 3 VDSL load-balanced internet circuits for breaking out. For segregation reasons I have seperated the LAN connection to 2 VLANs. One for management purposes (VLAN190, which is routable to the internal enterprise network), and one for the actual users (VLAN667, which is a non-routed VLAN for security reasons). I have also a VRRP interface under VLAN667 because I have an identical secondary hEX in case the primary fails. The thing is that the users listed in the ARP table are either labeled with the eth1-Vlan667 interface or vrrp1 interface, and I don't know why.
All users are being assigned addresses from the same DHCP server and can't explain this behavior.

Below is a part of the configuration and below that is the ARP table:
/interface ethernet
set [ find default-name=ether1 ] comment=LAN
set [ find default-name=ether2 ] comment=VDSL1_2103251803
set [ find default-name=ether3 ] comment=VDSL2_2103225424
set [ find default-name=ether4 ] comment=VDSL3_2103253015
set [ find default-name=ether5 ] disabled=yes
/interface vlan
add interface=ether1 name=eth1-vlan190 vlan-id=190
add interface=ether1 name=eth1-vlan667 vlan-id=667
/interface vrrp
add interface=eth1-vlan667 interval=3s name=vrrp1 on-backup="ip dhcp-server disable 0\
    \n" on-master="ip dhcp-server enable 0\
    \n" priority=254 vrid=10
/ip address
add address= comment=mngmnt interface=eth1-vlan190 network=
add address= comment=LAN_clients interface=eth1-vlan667 network=
add address= comment=VRRP interface=vrrp1 network=
add address= comment=WAN_VDSL1 interface=ether2 network=
add address= comment=WAN_VDSL2 interface=ether3 network=
add address= comment=WAN_VDSL3 interface=ether4 network=
/ip dhcp-server
add address-pool=pool1 disabled=no interface=eth1-vlan667 lease-time=8h name=server1
/ip dhcp-server network
add address= dns-server= gateway= netmask=23
/ip pool
add name=pool1 next-pool=pool1 ranges=,

[admin@MikroTik1] /ip arp> print
Flags: X - disabled, I - invalid, H - DHCP, D - dynamic, P - published, C - complete 
 #    ADDRESS         MAC-ADDRESS       INTERFACE                                                                                                                                                      
 0 DC       00:00:0C:07:AC:13 eth1-vlan190                                                                                                                                                   
 1 DC     28:FF:3E:04:D7:FC ether3                                                                                                                                                         
 2 DC    78:4F:43:6E:F5:0D eth1-vlan667                                                                                                                                                   
 3 DC    90:18:7C:E8:5C:EE eth1-vlan667                                                                                                                                                   
 4 DC    C0:D0:12:B9:36:77 eth1-vlan667                                                                                                                                                   
 5 DC    2C:59:8A:6B:F5:25 eth1-vlan667                                                                                                                                                   
 6 DC    FC:F8:AE:A6:7B:60 eth1-vlan667                                                                                                                                                   
 7 DC   8C:F5:A3:DB:F2:C2 eth1-vlan667                                                                                                                                                   
 8 DC    98:01:A7:15:48:AC eth1-vlan667                                                                                                                                                   
 9 DC    D0:87:E2:28:F6:5A eth1-vlan667                                                                                                                                                   
10 DC    10:3B:59:1A:3B:50 eth1-vlan667                                                                                                                                                   
11 DC    78:D7:5F:CA:38:47 eth1-vlan667                                                                                                                                                   
12 DC    B8:53:AC:5E:9E:0C eth1-vlan667                                                                                                                                                   
13 DC    00:0A:F5:C7:71:24 eth1-vlan667                                                                                                                                                   
14 DC    04:15:52:9E:51:8A eth1-vlan667                                                                                                                                                   
15 DC    84:BE:52:B8:90:D6 eth1-vlan667                                                                                                                                                   
16 DC   DC:37:14:70:08:B1 eth1-vlan667                                                                                                                                                   
17 DC   F0:99:BF:7D:60:00 eth1-vlan667                                                                                                                                                   
18 DC   7C:B0:C2:27:A9:2F eth1-vlan667                                                                                                                                                   
19 DC   2C:0E:3D:44:15:AF eth1-vlan667                                                                                                                                                   
20 DC   40:B8:9A:4B:86:BF eth1-vlan667                                                                                                                                                   
21 DC    8C:F5:A3:21:49:5A eth1-vlan667                                                                                                                                                   
22 DC    D0:C5:F3:60:CC:48 eth1-vlan667                                                                                                                                                   
23 DC    B8:53:AC:0A:2B:FD eth1-vlan667                                                                                                                                                   
24 DC   20:3C:AE:E3:4A:4B eth1-vlan667                                                                                                                                                   
25 DC    00:EB:2D:A2:FE:CB eth1-vlan667                                                                                                                                                   
26 DC   68:FB:7E:DB:60:05 eth1-vlan667                                                                                                                                                   
27 DC   30:07:4D:6F:FB:C1 eth1-vlan667                                                                                                                                                   
28 DC   24:F0:94:6B:40:8F eth1-vlan667                                                                                                                                                   
29 DC    A8:5B:78:86:4B:2E eth1-vlan667                                                                                                                                                   
30 DC   96:8F:A5:88:AD:7B eth1-vlan667                                                                                                                                                   
31 DC   A4:B8:05:CD:45:FB eth1-vlan667                                                                                                                                                   
32 DC   C0:D0:12:A2:FE:97 eth1-vlan667                                                                                                                                                   
33 DC   60:D9:C7:AA:AF:5B eth1-vlan667                                                                                                                                                   
34 DC   48:4B:AA:46:92:86 eth1-vlan667                                                                                                                                                   
35 DC   34:FC:EF:A6:8A:2A eth1-vlan667                                                                                                                                                   
36 DC    20:6E:9C:74:5D:A8 eth1-vlan667                                                                                                                                                   
37 DC     78:C1:A7:3B:5B:14 ether4                                                                                                                                                         
38 DC    00:03:AB:BD:65:CA eth1-vlan667                                                                                                                                                   
39 DC    44:85:00:EF:8B:E3 eth1-vlan667                                                                                                                                                   
40 DC   8C:C5:E1:1A:09:BF eth1-vlan667                                                                                                                                                   
41 DC    B8:53:AC:08:80:FD eth1-vlan667                                                                                                                                                   
42 DC     D4:21:22:4A:3E:B0 ether2                                                                                                                                                         
43 DC    70:F0:87:D2:C7:F8 eth1-vlan667                                                                                                                                                   
44 DC    24:A0:74:54:8C:D6 eth1-vlan667                                                                                                                                                   
45 DC    48:4B:AA:50:7B:7B eth1-vlan667                                                                                                                                                   
46 DC   60:AF:6D:C0:22:4E eth1-vlan667                                                                                                                                                   
47 DC   84:89:AD:43:A5:A0 eth1-vlan667                                                                                                                                                   
48 DC   48:74:6E:5A:9B:E6 eth1-vlan667                                                                                                                                                   
49 DC    58:40:4E:7A:82:46 eth1-vlan667                                                                                                                                                   
50 DC    44:85:00:EF:8B:E3 vrrp1                                                                                                                                                          
51 DC    B8:53:AC:0A:2B:FD vrrp1                                                                                                                                                          
52 DC   68:FB:7E:DB:60:05 vrrp1                                                                                                                                                          
53 DC    B8:53:AC:5E:9E:0C vrrp1                                                                                                                                                          
54 DC    84:BE:52:B8:90:D6 vrrp1                                                                                                                                                          
55 DC   40:B8:9A:4B:86:BF vrrp1                                                                                                                                                          
56 DC    A8:5B:78:86:4B:2E vrrp1                                                                                                                                                          
57 DC   48:74:6E:5A:9B:E6 vrrp1                                                                                                                                                          
58 DC    24:A0:74:54:8C:D6 vrrp1                                                                                                                                                          
59 DC   DC:37:14:70:08:B1 vrrp1                                                                                                                                                          
60 DC   24:F0:94:6B:40:8F vrrp1                                                                                                                                                          
61 DC    70:F0:87:D2:C7:F8 vrrp1                                                                                                                                                          
62 DC   60:D9:C7:AA:AF:5B vrrp1                                                                                                                                                          
63 DC    04:15:52:9E:51:8A vrrp1                                                                                                                                                          
64 DC    98:01:A7:15:48:AC vrrp1                                                                                                                                                          
65 DC   F0:99:BF:7D:60:00 vrrp1                                                                                                                                                          
66 DC    C0:D0:12:B9:36:77 vrrp1                                                                                                                                                          
67 DC    2C:59:8A:6B:F5:25 vrrp1                                                                                                                                                          
68 DC    D0:C5:F3:60:CC:48 vrrp1                                                                                                                                                          
69 DC   7C:B0:C2:27:A9:2F vrrp1                                                                                                                                                          
70 DC   96:8F:A5:88:AD:7B vrrp1                           

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