Hi,
I am a happy RouterOS user for years now, using the RB751U-2HnD and a 5.x RouterOS version.
However there was an issue with wireless performance on some area’s, so I decided to buy a small RBmAP2n to extend the wireless coverage.
I ended up with this configuration:
Device RBmAP2n:
- RouterOS v6.26 - CAPsMAN v2
- CAP “the remote CAP”
Device RB751U: - RouterOS v6.26 - CAPsMAN v2
- CAPsMAN
- CAP (locally connected to CAPsMAN)
- 1 Bridge including the 2 CAPsMAN interfaces (1 local, 1 remote), and the local Ethernet.
The 2 CAP’s have the same settings.
Problem:
The remote CAP works perfectly, but the local CAP has ARP problems.
Symptoms:
- Ethernet: pinging to hosts works fine
- WIFI - remote CAP:
I have disabled the local CAP interface on the CAPsMAN router (RB751U), so only the remote CAP interface provides the wireless connection:
→ Pinging to local network hosts works fine. - WIFI - local CAP:
I have disabled the remote CAP interface on the CAPsMAN router (RB751U), so only the local CAP interface provides the wireless connection:
→ Pinging to local network hosts fails
Investigation:
I have fired up wireshark on my laptop, and found that there were no ARP responses coming back on the ARP requests (switching from local CAP to remote CAP immediately solves the problem)
Then i fired up the packet sniffer in the CAPsMAN router (RB751U), and sniffed ARP packets on the local CAP interface: there I could see the ARP responses! They just don’t make it through the wireless connection?
Settings: (hopefully of interest)
The local CAP
[admin@MikroTik] > /interface wireless cap print
enabled: yes
interfaces: wlan1
certificate: none
lock-to-caps-man: no
discovery-interfaces: bridge-local
caps-man-addresses:
caps-man-names:
caps-man-certificate-common-names:
bridge: bridge-local
The CAP interfaces
[admin@MikroTik] > /caps-man interface print
Flags: M - master, D - dynamic, B - bound,
X - disabled, I - inactive, R - running
# NAME RADIO-MAC MASTER-INTERFACE
0 M BX cap1_remote 4C:5E:00:B9:00:00 none
1 M BR cap2_local D4:CA:00:7F:00:00 none
The CAPsMAN configuration
[admin@MikroTik] > /caps-man configuration print
0 name="cfg1" mode=ap ssid="xxxx" security=security1 channel=channel1
The actual? inferface configuration
[admin@MikroTik] > /caps-man actual-interface-configuration print
Flags: M - master, D - dynamic, B - bound,
X - disabled, I - inactive, R - running
0 M BX name="cap1_remote" mtu=1500 l2mtu=1600 mac-address=4C:5E:00:B9:00:00
arp=enabled radio-mac=4C:5E:00:B9:00:00 master-interface=none
configuration.mode=ap configuration.ssid="xxxx"
security.authentication-types=wpa2-psk security.encryption=aes-ccm
security.passphrase="xxxx" channel.frequency=2422 channel.width=20
channel.band=2ghz-b/g/n
1 M B name="cap2_local" mtu=1500 l2mtu=1600 mac-address=D4:CA:00:7F:00:00
arp=enabled radio-mac=D4:CA:00:7F:00:00 master-interface=none
configuration.mode=ap configuration.ssid="xxxx"
security.authentication-types=wpa2-psk security.encryption=aes-ccm
security.passphrase="xxxx" channel.frequency=2422 channel.width=20
channel.band=2ghz-b/g/n
Does anybody have an idea? Thanks!