Client - intel centrino 6200 AGN.
Problem solved:
To achieve transfer rates greater than 54 Mbps on 802.11n connections, WPA2-AES security must be selected. No security (None) can be selected to enable network setup and troubleshooting. An administrator can enable or disable support for high throughput mode to reduce power-consumption or conflicts with other bands or compatibility issues.
P.S. on 5.0 i have problems with wireless, but on 4.17 - almost everything is allright.
(distance from my laptop to this router - 3 meters)
PING log on 5.0:
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=13ms TTL=64
Reply from 192.168.3.254: bytes=32 time=22ms TTL=64
Reply from 192.168.3.254: bytes=32 time=37ms TTL=64
Reply from 192.168.3.254: bytes=32 time=59ms TTL=64
Reply from 192.168.3.254: bytes=32 time=81ms TTL=64
Reply from 192.168.3.254: bytes=32 time=114ms TTL=64
Reply from 192.168.3.254: bytes=32 time=63ms TTL=64
Reply from 192.168.3.254: bytes=32 time=33ms TTL=64
Reply from 192.168.3.254: bytes=32 time=9ms TTL=64
Reply from 192.168.3.254: bytes=32 time=51ms TTL=64
Reply from 192.168.3.254: bytes=32 time=22ms TTL=64
Reply from 192.168.3.254: bytes=32 time=227ms TTL=64
Reply from 192.168.3.254: bytes=32 time=60ms TTL=64
Reply from 192.168.3.254: bytes=32 time=66ms TTL=64
Reply from 192.168.3.254: bytes=32 time=151ms TTL=64
Reply from 192.168.3.254: bytes=32 time=194ms TTL=64
Reply from 192.168.3.254: bytes=32 time=228ms TTL=644
4.17:
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=2ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=32ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=8ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=5ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=2ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=2ms TTL=64
Reply from 192.168.3.254: bytes=32 time=45ms TTL=64
Reply from 192.168.3.254: bytes=32 time=12ms TTL=64
Reply from 192.168.3.254: bytes=32 time=2ms TTL=64
Reply from 192.168.3.254: bytes=32 time=31ms TTL=64
Reply from 192.168.3.254: bytes=32 time=45ms TTL=64
Reply from 192.168.3.254: bytes=32 time=69ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time=4ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Reply from 192.168.3.254: bytes=32 time<1ms TTL=64
Any ideas? Or it's just wireless interference ? There is many wireless networks around..