We have some 40 SXT-Lites installed lately and several of these have speed problems.
We can make a tcp bandwith test from a laptop to the SXT-L and we are getting high download speeds (TO the laptop) but only some 8-12Mb upload.)
A bandwith test performed from the SXT-L to its AP gives 20-40Mb depending on network and link parameters.
But bandwith tests performed from a laptop OVER the SXT-L's are not even reaching 1Mb!
There are hardly firewall rules in place, little mangle and only one src-nat.
No queues are set. (Traffic is limited at the endpoint of my network, several routers away.)
What I now found out is that when I disable the connection tracking, speeds suddenly run up OVER de router (and towards and from) as to be expected. The cpu of the laptop or the SXT-L is maxing out.
But, in disabling connection tracking, surfing on the internet is not longer possible.
SXT's are all in routing mode. WLAN (WAN side) is dhcp-client and Ethernet interface is LAN with a dhcp-server.
Firewall nat has one rule to translate all traffic from lan (/24) the masquerade of the IP of the Wlan side.
What to do?
It only is the case on 4 of these units now. How come? Where to look for possible issues and/or solutions...