Posted: Fri Oct 16, 2020 13:45 Post subject: 3 Linksys devices, help with wireless channel configuration
Hi,
I normally dont post questions on forums unless I really cant find an answer and thats exactly where I am now. Hope one of you DDWRT masters can spare a minute and help out.
I have 3 linksys ddwrt devices all on the same subnet, all hardwired.
I am attempting to setup 3 non conflicting non overlapping 5 GHz/802.11ac (one one each device) VHT80 channels. The devices and ddwrt versions are as follows:
wrt1900acs: v3.0-r41771 std (12/21/19) - main router
wrt1900acs-v2: v3.0-r44048 std (08/02/20) - wireless access point
wrt1200ac-v2: v3.0-r44048 std (08/02/20) - wireless access point
Googling this question led me to understand that the channels to use are 42,58,106,122,155 as these dont overlap and therefore do not cause signal interference to each other... Except I dont have any of those in the channel list dropdown on the routers.
The closest I can get is, picking channel 42 for example, is to select channel 40 on the router and set the extension channel to UL (+2). Is this correct? Meaning, does this in fact set the channel to 42 as was intended?
Guys.. can someone please make my life easier and give me a quick reply with 3 channels and correct extensions for each?
Thanking you in advance.. and here's to hoping I am positing this in the right forum
unfortunately you can't say that, it also depends on the regulatory domain (allowed frequencies and transmission power)
I defaulted to North America to match the chart and we don't know where OP is located. It's still good advice to avoid DFS range if in a big city, but especially when using Marvell routers.
I had an interesting problem recently when I was using 2 5Ghz AP's where shortly after setting it up the 5Ghz went screwy on some of my routers.
At first I simply reverted to using one 5Ghz AP, but after thinking about it I remembered that one of AP's was on Ch 100 and the other on 149. I have retried the configuration but changed to using 36 and 149. So far all has been well with this. My reasoning is that because one of my AP's was on Ch 100 which is in the DFS range that somehow the system was detecting the signal as a radar signature and confusing the router. Just a thought but it's the best I can conclude. _________________ Starlink & DSL -> TPLink TL-R470T+
->
WRT3200acm Master WDS 5GHz 80Mhz CH 100 (+6) r55819
Ath1 2.4Ghz Disabled
99 Static Leases
ExpressVPN
WRT3200acm r55819 WDS Station 5Ghz
Ath1 AP N/G Mixed Channel 11 HT40
WRT1900Ac V1 5Ghz r55819 WDS Station
(Defective, no 2.4Ghz but 5Ghz works great)
WRT1900AC V1 5Ghz AC 80Mhz WDS Station r55819
2.4Ghz AP Ch1 HT20 Mixed
WRT1900ACS SPARE r54914
WRT1900AC SPARE r54914
WRT1900AC V1 5Ghz AC 80Mhz WDS-AP r55819
2.4Ghz AP Ch1 HT20 Mixed
WRT54G DD-WRT v3.0-r37305 micro AP CH 6 Mixed - Not in use
I have retried the configuration but changed to using 36 and 149. So far all has been well with this. My reasoning is that because one of my AP's was on Ch 100 which is in the DFS range that somehow the system was detecting the signal as a radar signature and confusing the router. Just a thought but it's the best I can conclude.
I don't think so, DFS (dynamic frequency selection) works like this
an AP located in the DFS frequency range scans periodically for high power radar pulses
if the AP detects radar pulses it changes the channel to a non-DFS channel
the real problem is that the clients in the DFS area are only allowed to scan passively, they are only allowed to scan when they receive a beacon from an AP, so roaming between AP's is slower
is therefore only relevant if you run multiple AP's
Joined: 30 May 2017 Posts: 582 Location: Rural Manitoba
Posted: Fri Oct 16, 2020 22:46 Post subject:
ho1Aetoo wrote:
WENED wrote:
I have retried the configuration but changed to using 36 and 149. So far all has been well with this. My reasoning is that because one of my AP's was on Ch 100 which is in the DFS range that somehow the system was detecting the signal as a radar signature and confusing the router. Just a thought but it's the best I can conclude.
I don't think so, DFS (dynamic frequency selection) works like this
an AP located in the DFS frequency range scans periodically for high power radar pulses
if the AP detects radar pulses it changes the channel to a non-DFS channel
the real problem is that the clients in the DFS area are only allowed to scan passively, they are only allowed to scan when they receive a beacon from an AP, so roaming between AP's is slower
is therefore only relevant if you run multiple AP's
I hear and fully understand what you are saying. Incidentally I have over 50 years of experience in electronics so what you are saying makes sense if I was speaking about client connection. However if you review what I said you will see that I was referring exclusively to the routers. The two routers in question have < 5' spacing and since I changed the AP channels to outside of DFS channels I have encountered no problems. The only reason I was using Channel 100 +6 was due to a need at one time to have a VAP on the client Router and since VAP's on a client will only function on Channel 100+ I had no choice. Since I decided to run the second Router with a 5Ghz AP, I no longer had a need for using Channel 100 on my primary router.
I do thank you however for your input and appreciate that I may not have clear about my observations. If I was absolutely convinced that a problem existed with the particular configuration I would open a ticket accordingly, but since it was only an observation I just threw it out there in the event someone else might be experiencing the same strange behavior. _________________ Starlink & DSL -> TPLink TL-R470T+
->
WRT3200acm Master WDS 5GHz 80Mhz CH 100 (+6) r55819
Ath1 2.4Ghz Disabled
99 Static Leases
ExpressVPN
WRT3200acm r55819 WDS Station 5Ghz
Ath1 AP N/G Mixed Channel 11 HT40
WRT1900Ac V1 5Ghz r55819 WDS Station
(Defective, no 2.4Ghz but 5Ghz works great)
WRT1900AC V1 5Ghz AC 80Mhz WDS Station r55819
2.4Ghz AP Ch1 HT20 Mixed
WRT1900ACS SPARE r54914
WRT1900AC SPARE r54914
WRT1900AC V1 5Ghz AC 80Mhz WDS-AP r55819
2.4Ghz AP Ch1 HT20 Mixed
WRT54G DD-WRT v3.0-r37305 micro AP CH 6 Mixed - Not in use
