我有一个debian服务器，作为一个无线路由器和DHCP和FTP服务器。
我想使用佳能无线文件传输器连接到此服务器。
我可以连接并接收IP地址。 我可以在系统日志中validation这一点：
Aug 4 21:37:02 box-3 hostapd: wlan0: STA 00:00:85:ff:81:cc IEEE 802.11: authenticated Aug 4 21:37:02 box-3 hostapd: wlan0: STA 00:00:85:ff:81:cc IEEE 802.11: associated (aid 2) Aug 4 21:37:02 box-3 hostapd: wlan0: STA 00:00:85:ff:81:cc RADIUS: starting accounting session 501D7991-00000002 Aug 4 21:37:02 box-3 dhcpd: DHCPDISCOVER from 00:00:85:ff:81:cc via wlan0 Aug 4 21:37:02 box-3 dhcpd: DHCPOFFER on 10.10.0.24 to 00:00:85:ff:81:cc via wlan0 Aug 4 21:37:02 box-3 dhcpd: DHCPDISCOVER from 00:00:85:ff:81:cc via wlan0 Aug 4 21:37:02 box-3 dhcpd: DHCPOFFER on 10.10.0.24 to 00:00:85:ff:81:cc via wlan0 Aug 4 21:37:02 box-3 dhcpd: DHCPREQUEST for 10.10.0.24 (10.10.0.1) from 00:00:85:ff:81:cc via wlan0 Aug 4 21:37:02 box-3 dhcpd: DHCPACK on 10.10.0.24 to 00:00:85:ff:81:cc via wlan0 Aug 4 21:37:02 box-3 dhcpd: DHCPREQUEST for 10.10.0.24 (10.10.0.1) from 00:00:85:ff:81:cc via wlan0 Aug 4 21:37:02 box-3 dhcpd: DHCPACK on 10.10.0.24 to 00:00:85:ff:81:cc via wlan0 但是，文件发送器似乎在发现或连接到FTP服务器时遇到问题。
当我尝试ping IP地址时，有时可以到达文件发送器，然后连接打开，文件发送器可以到达FTP服务器。
但是这并不总是奏效。
我尝试了tcpdump所有的stream量在我的wlan0设备，但我得到的是一些ARP请求。
有什么办法可以debugging呢？