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Dalibor
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Posts: 9
Joined: Wed Dec 21, 2016 10:22 pm

TPLINK CPE710 and MIKROTIK SXT G-5HPacD r2 channel width problem

Fri Oct 14, 2022 9:41 pm

Hi everyone,

i have a problem with TPLINK CPE710 in client mode. I am using mikrotik SXT SA 5GHz 866MHz as an access point and CPE710 as a client which is hardwired to my PC. I am trying to establish a faster connect to SXT AP with at least 40MHz or 80MHz channel width but I am unable to do so. It is always locking me at 20MHz channel width on mikrotik no matter what.

This is my config:
# oct/14/2022 20:25:32 by RouterOS 6.49.6
# software id = 0LCV-L3CB
#
# model = SXT G-5HPacD r2
# serial number = 
/interface bridge
add name=bridge
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
add authentication-types=wpa2-psk eap-methods="" group-key-update=1h5m mode=\
    dynamic-keys name=profile1 supplicant-identity="" wpa-pre-shared-key=\
    1234567890 wpa2-pre-shared-key=1234567890
/interface wireless
set [ find default-name=wlan1 ] band=5ghz-a/n/ac channel-width=\
    20/40/80mhz-eCee country="etsi 5.7-5.8 srd" disabled=no frequency=5795 \
    frequency-mode=superchannel installation=outdoor mode=ap-bridge \
    radio-name=JUST_TEST security-profile=profile1 ssid=TEST_WIFI wmm-support=\
    enabled
/ip dhcp-server
add add-arp=yes address-pool=default-dhcp interface=wlan1 name=defconf
/interface bridge port
add bridge=bridge comment=defconf interface=ether1
add bridge=bridge comment=defconf interface=wlan1
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface list member
add comment=defconf interface=ether1 list=LAN
add comment=defconf interface=wlan1 list=WAN
/ip address
add address=192.168.66.200/24 comment=defconf interface=ether1 network=\
    192.168.66.0
/ip dhcp-client
add comment=defconf interface=bridge
/ip dhcp-server network
add address=192.168.66.0/24 comment=defconf dns-server=192.168.66.1 gateway=\
    192.168.66.1
/ip dns
set allow-remote-requests=yes servers=192.168.66.1
/ip dns static
add address=192.168.66.1 comment=defconf name=router.lan
/ip firewall filter
add action=accept chain=input comment=\
    "defconf: accept established,related,untracked" connection-state=\
    established,related,untracked disabled=yes
add action=drop chain=input comment="defconf: drop invalid" connection-state=\
    invalid disabled=yes
add action=accept chain=input comment="defconf: accept ICMP" disabled=yes \
    protocol=icmp
add action=accept chain=input comment=\
    "defconf: accept to local loopback (for CAPsMAN)" dst-address=127.0.0.1
add action=drop chain=input comment="defconf: drop all not coming from LAN" \
    disabled=yes in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept in ipsec policy" \
    ipsec-policy=in,ipsec
add action=accept chain=forward comment="defconf: accept out ipsec policy" \
    ipsec-policy=out,ipsec
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" \
    connection-state=established,related
add action=accept chain=forward comment=\
    "defconf: accept established,related, untracked" connection-state=\
    established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" \
    connection-state=invalid disabled=yes
add action=drop chain=forward comment=\
    "defconf: drop all from WAN not DSTNATed" connection-nat-state=!dstnat \
    connection-state=new disabled=yes in-interface-list=WAN
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" \
    ipsec-policy=out,none out-interface-list=WAN
/ip route
add distance=1 gateway=192.168.66.1
/tool mac-server
set allowed-interface-list=LAN
/tool mac-server mac-winbox
set allowed-interface-list=LAN


Any ideas what could be wrong? Are they incompatible maybe?
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User avatar
mkx
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Posts: 11433
Joined: Thu Mar 03, 2016 10:23 pm

Re: TPLINK CPE710 and MIKROTIK SXT G-5HPacD r2 channel width problem

Sat Oct 15, 2022 12:22 am

Setting 80MHz channel width with eCee channel layout and 5795MHz centre frequency of C channel is not a legal combination.

If you look at list of WiFi channels, 5GHz section, you'll see that valid 80MHz channel in vicinity of frequency set in your config, contains the following 20MHz channels: 5745, 5765, 5785 and 5805. Any combination with slightly higher or slightly lower frequrncues (e.g. 5765, 5785, 5805 and 5825) is not a valid 80MHz channel. If you want to use channel layout eCee, then the centre frequency should be set to 5765. This will allow to use 20MHz channel number 153 or 40MHz channel number 151 or 80MHz channel number 155.

In ROS one has to use 20MHz frequencies even when setting up wider channels, hence setting 5795 (centre frequency of 40MHz channel number 159) doesn't produce a valid 40MHz channel. The reason is that due to backward compatibility, ROS actually supports only 20+20(+20+20) MHz contigous channel layout, not "native" 40 MHz or 80 MHz channels, even though the config says 40 (or 80).

Some devices tollerate non-standard frequency layouts (such as the one you tried to use) while others are strict about that.
 
Dalibor
just joined
Topic Author
Posts: 9
Joined: Wed Dec 21, 2016 10:22 pm

Re: TPLINK CPE710 and MIKROTIK SXT G-5HPacD r2 channel width problem

Sat Oct 15, 2022 1:44 pm

I've looked up all legal frequencies, set them up on mikrotik and now everything is working great.
Thank you

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