I just got a new AR-750 router, and set it up pretty much the same as I’ve done with my AR-300M routers. Things work, however, the bridged network (wlan-sta) is incredibly unstable. I don’t see anything useful in the logs, but doing a ping on the box to the upstream WiFi routers default route IP (192.168.201.1 in this case) shows severe packet loss and delays:
root@travel:~# ping 192.168.201.1
PING 192.168.201.1 (192.168.201.1): 56 data bytes
64 bytes from 192.168.201.1: seq=0 ttl=64 time=818.685 ms
64 bytes from 192.168.201.1: seq=1 ttl=64 time=2.083 ms
64 bytes from 192.168.201.1: seq=2 ttl=64 time=554.770 ms
64 bytes from 192.168.201.1: seq=3 ttl=64 time=1600.792 ms
64 bytes from 192.168.201.1: seq=4 ttl=64 time=601.398 ms
64 bytes from 192.168.201.1: seq=5 ttl=64 time=6.875 ms
64 bytes from 192.168.201.1: seq=6 ttl=64 time=1.863 ms
64 bytes from 192.168.201.1: seq=7 ttl=64 time=1.895 ms
^C
— 192.168.201.1 ping statistics —
17 packets transmitted, 8 packets received, 52% packet loss
round-trip min/avg/max = 1.863/448.545/1600.792 ms
When it works, it’s fine (less than 2ms RTT), but in between, the network is basically useless. On the “internal” side, things are a lot better too:
sleipnir (20:08) 169/0 $ ping 192.168.8.1
PING 192.168.8.1 (192.168.8.1): 56 data bytes
64 bytes from 192.168.8.1: icmp_seq=0 ttl=64 time=1.907 ms
64 bytes from 192.168.8.1: icmp_seq=1 ttl=64 time=1.465 ms
64 bytes from 192.168.8.1: icmp_seq=2 ttl=64 time=1.708 ms
64 bytes from 192.168.8.1: icmp_seq=3 ttl=64 time=2.140 ms
64 bytes from 192.168.8.1: icmp_seq=4 ttl=64 time=15.267 ms
64 bytes from 192.168.8.1: icmp_seq=5 ttl=64 time=17.999 ms
64 bytes from 192.168.8.1: icmp_seq=6 ttl=64 time=5.587 ms
64 bytes from 192.168.8.1: icmp_seq=7 ttl=64 time=5.237 ms
64 bytes from 192.168.8.1: icmp_seq=8 ttl=64 time=1.148 ms
64 bytes from 192.168.8.1: icmp_seq=9 ttl=64 time=0.925 ms
64 bytes from 192.168.8.1: icmp_seq=10 ttl=64 time=1.897 ms
64 bytes from 192.168.8.1: icmp_seq=11 ttl=64 time=1.973 ms
^C
— 192.168.8.1 ping statistics —
12 packets transmitted, 12 packets received, 0.0% packet loss
I’m using the 2.4Ghz radio to connect upstream (192.168.201/24 above), and the 5Ghz radio for the internal network (192.168.8/24 which my laptop connects to). Doing a ping from the laptop, to e.g. Facebook, going through both radios, shows similarly bad packet losses:
sleipnir (20:02) 383/0 $ ping www.facebook.com
PING star-z-mini.c10r.facebook.com (31.13.93.39): 56 data bytes
64 bytes from 31.13.93.39: icmp_seq=0 ttl=53 time=33.034 ms
64 bytes from 31.13.93.39: icmp_seq=1 ttl=53 time=42.314 ms
64 bytes from 31.13.93.39: icmp_seq=2 ttl=53 time=999.422 ms
64 bytes from 31.13.93.39: icmp_seq=3 ttl=53 time=34.974 ms
64 bytes from 31.13.93.39: icmp_seq=4 ttl=53 time=300.404 ms
Request timeout for icmp_seq 5
Request timeout for icmp_seq 6
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
64 bytes from 31.13.93.39: icmp_seq=5 ttl=53 time=4350.275 ms
64 bytes from 31.13.93.39: icmp_seq=6 ttl=53 time=3350.069 ms
64 bytes from 31.13.93.39: icmp_seq=7 ttl=53 time=2350.375 ms
I’m not sure where to look to debug / fix this, so any hints are much welcome. I’m running the latest firmware on this router.