Agans, mau nanya dong, gini masalahnya.....

Saya ada raspbian (tentu di install di raspi), masalahnya si raspi ini seringkali ga bisa di ping dari LAN (apalagi di browse sambanya).
Kalo udah begini si raspi harus nge-ping dulu ke host yang mau ngeping tadi (atau mau ngebrowse sambanya), baru deh dia bisa di ping/di browse.
Apakah si raspi keputus dari network? Ga, karena selama proses ga bisa di-ping tadi, si raspi tetep bisa di browse webservernya atau di-ssh, asalkan pake nama internet, alias ga lewat LAN. Jadi kesimpulannya si raspi tetep konek ke inet, cuma ga bisa di ping dari LAN aja.


output lsusb

Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.

Bus 001 Device 004: ID 05e3:0612 Genesys Logic, Inc.

Bus 001 Device 007: ID 148f:2573 Ralink Technology, Corp. RT2501/RT2573 Wireless Adapter

Bus 001 Device 006: ID 0bc2:5021 Seagate RSS LLC FreeAgent GoFlex USB 2.0

output ifconfig

eth0 Link encap:Ethernet HWaddr b8:27:eb:b7:26:0e

 UP BROADCAST MULTICAST MTU:1500 Metric:1

 RX packets:0 errors:0 dropped:0 overruns:0 frame:0

 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

 collisions:0 txqueuelen:1000

 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

 

 lo Link encap:Local Loopback

 inet addr:127.0.0.1 Mask:255.0.0.0

 UP LOOPBACK RUNNING MTU:16436 Metric:1

 RX packets:2027 errors:0 dropped:0 overruns:0 frame:0

 TX packets:2027 errors:0 dropped:0 overruns:0 carrier:0

 collisions:0 txqueuelen:0

 RX bytes:167652 (163.7 KiB) TX bytes:167652 (163.7 KiB)

 

 wlan0 Link encap:Ethernet HWaddr 00:0e:e8:d4:5d:39

 inet addr:192.168.0.100 Bcast:192.168.0.255 Mask:255.255.255.0

 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

 RX packets:5530026 errors:0 dropped:0 overruns:0 frame:0

 TX packets:7664344 errors:0 dropped:0 overruns:0 carrier:0

 collisions:0 txqueuelen:1000

 RX bytes:829572684 (791.1 MiB) TX bytes:550946250 (525.4 MiB)

output dmesg.

[Sat Aug 3 06:55:13 2013] wlan0: deauthenticated from c8:d7:19:b0:e3:ac (Reason: 7)

[Sat Aug 3 06:55:13 2013] cfg80211: Calling CRDA to update world regulatory domain

[Sat Aug 3 06:55:16 2013] wlan0: authenticate with c8:d7:19:b0:e3:ac

[Sat Aug 3 06:55:16 2013] wlan0: send auth to c8:d7:19:b0:e3:ac (try 1/3)

[Sat Aug 3 06:55:16 2013] wlan0: authenticated

[Sat Aug 3 06:55:16 2013] rt73usb 1-1.2.1:1.0: wlan0: disabling HT as WMM/QoS is not supported

[Sat Aug 3 06:55:16 2013] wlan0: associate with c8:d7:19:b0:e3:ac (try 1/3)

[Sat Aug 3 06:55:16 2013] wlan0: RX AssocResp from c8:d7:19:b0:e3:ac (capab=0x411 status=0 aid=1)

[Sat Aug 3 06:55:16 2013] wlan0: associated

[Sat Aug 3 06:55:23 2013] wlan0: deauthenticated from c8:d7:19:b0:e3:ac (Reason: 7)

[Sat Aug 3 06:55:23 2013] cfg80211: Calling CRDA to update world regulatory domain

[Sat Aug 3 06:55:26 2013] wlan0: authenticate with c8:d7:19:b0:e3:ac

[Sat Aug 3 06:55:26 2013] wlan0: send auth to c8:d7:19:b0:e3:ac (try 1/3)

[Sat Aug 3 06:55:26 2013] wlan0: authenticated

[Sat Aug 3 06:55:26 2013] rt73usb 1-1.2.1:1.0: wlan0: disabling HT as WMM/QoS is not supported

[Sat Aug 3 06:55:26 2013] wlan0: associate with c8:d7:19:b0:e3:ac (try 1/3)

[Sat Aug 3 06:55:26 2013] wlan0: associate with c8:d7:19:b0:e3:ac (try 2/3)

[Sat Aug 3 06:55:26 2013] wlan0: associate with c8:d7:19:b0:e3:ac (try 3/3)

[Sat Aug 3 06:55:27 2013] wlan0: association with c8:d7:19:b0:e3:ac timed out

[Sat Aug 3 06:55:28 2013] wlan0: authenticate with c8:d7:19:b0:e3:ac

[Sat Aug 3 06:55:28 2013] wlan0: send auth to c8:d7:19:b0:e3:ac (try 1/3)

[Sat Aug 3 06:55:28 2013] wlan0: authenticated

[Sat Aug 3 06:55:28 2013] rt73usb 1-1.2.1:1.0: wlan0: disabling HT as WMM/QoS is not supported

[Sat Aug 3 06:55:28 2013] wlan0: associate with c8:d7:19:b0:e3:ac (try 1/3)

[Sat Aug 3 06:55:28 2013] wlan0: RX AssocResp from c8:d7:19:b0:e3:ac (capab=0x411 status=0 aid=1)

[Sat Aug 3 06:55:28 2013] wlan0: associated

[Sun Aug 4 07:33:27 2013] Peer 39.112.11.167:29671/39744 unexpectedly shrunk window 4046126933:4046133739 (repaired)

[Sun Aug 4 07:33:32 2013] Peer 39.112.11.167:29671/39744 unexpectedly shrunk window 4046126933:4046133739 (repaired)

[Sun Aug 4 07:33:43 2013] Peer 39.112.11.167:29671/39744 unexpectedly shrunk window 4046126933:4046133739 (repaired)

[Sun Aug 4 07:34:05 2013] Peer 39.112.11.167:29671/39744 unexpectedly shrunk window 4046126933:4046133739 (repaired)

[Sun Aug 4 07:34:48 2013] Peer 39.112.11.167:29671/39744 unexpectedly shrunk window 4046126933:4046133739 (repaired)

[Sun Aug 4 07:36:15 2013] Peer 39.112.11.167:29671/39744 unexpectedly shrunk window 4046126933:4046133739 (repaired)

[Sun Aug 4 13:44:23 2013] ip_tables: (C) 2000-2006 Netfilter Core Team

dan ga ada rule iptables.

Tanya:
1. Kenapa gitu ya? kenapa kalo ngeping duluan dia bisa, sekalian ga bisa sama sekali lebih masuk akal.
2. ada beberapa output dmesg yang deautenthicated, itu kenapa ya?

Terima Kasih sebelumnya agans.