STA trying to ping, but nothing happen.

we suggest enable station-trace on diagnose view: 

[AC6005-diagnose]station-trace sta-mac xxxx-xxxx-1234 

[-HW-1-diagnose]<7>Jul 24 2018 10:39:59.590.1 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1455] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 Recved from target
< 7>Jul 24 2018 10:39:59.590.2 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1455] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 elapsed[0 ms] Entering rx reorder
< 7>Jul 24 2018 10:39:59.590.3 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1455] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 elapsed[0 ms] Exiting rx reorder for release
< 7>Jul 24 2018 10:39:59.590.4 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1455] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 elapsed[0 ms] Success to send pkt to software switch
< 7>Jul 24 2018 10:40:02.360.1 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1468] [ARP] ARP response : 192.168.74.1 is at abab-cdcd-c020 Recved from software switch
< 7>Jul 24 2018 10:40:02.360.2 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1468] [ARP] ARP response : 192.168.74.1 is at abab-cdcd-c020 elapsed[0 ms] Sending pkt to target(Single)
< 7>Jul 24 2018 10:40:02.360.3 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1468] [ARP] ARP response : 192.168.74.1 is at abab-cdcd-c020 elapsed[0 ms] Success to send pkt to air
< 7>Jul 24 2018 10:40:04.540.1 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1476] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 Recved from target
< 7>Jul 24 2018 10:40:04.540.2 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1476] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 elapsed[0 ms] Entering rx reorder
< 7>Jul 24 2018 10:40:04.540.3 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1476] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 elapsed[0 ms] Exiting rx reorder for release
< 7>Jul 24 2018 10:40:04.540.4 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1476] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 elapsed[0 ms] Success to send pkt to software switch
< 7>Jul 24 2018 10:40:08.560.1 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1485] [ARP] ARP response : 192.168.74.1 is at abab-cdcd-c020 Recved from software switch
< 7>Jul 24 2018 10:40:08.560.2 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1485] [ARP] ARP response : 192.168.74.1 is at abab-cdcd-c020 elapsed[0 ms] Sending pkt to target(Single)
< 7>Jul 24 2018 10:40:08.560.3 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1485] [ARP] ARP response : 192.168.74.1 is at abab-cdcd-c020 elapsed[0 ms] Success to send pkt to air
< 7>Jul 24 2018 10:40:11.460.1 AP-9 WIFI/7/BTRACE:[BTRACE][WLAN_WIFI][xxxx-xxxx-1234]:SeqNo[1490] [ARP] ARP request : who has 192.168.74.1 ? tell 192.168.74.234 Recved from target
 

we check the trace log , we found the gateway device delay response the arp-request , so the client keep send the arp-request packet again and again .

 because the gateway device is not huawei, so we suggest the customer configure the gateway on the AC6005 device and test .

interface Vlanif11
description FR-WMS2
ip address 192.168.74.2 255.255.255.0
dhcp select interface
dhcp server gateway-list 192.168.74.2
dhcp server lease day 2 hour 0 minute 0
dhcp server dns-list 192.168.2.2 192.168.64.8
dhcp server nbns-list 192.168.64.8

after change the configuration, we test again , below is the new trace result and station working fine.