On Tue, Oct 26, 2010 at 01:03:32PM +0200, Johannes Stezenbach wrote: > > (The client is sending ARP requests but not getting answer: > zzz:~# tcpdump -p -i wlan0 > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on wlan0, link-type EN10MB (Ethernet), capture size 65535 bytes > 13:00:35.740957 ARP, Request who-has 172.28.120.1 tell 172.28.120.2, length 28 > 13:00:36.740924 ARP, Request who-has 172.28.120.1 tell 172.28.120.2, length 28 > 13:00:37.740926 ARP, Request who-has 172.28.120.1 tell 172.28.120.2, length 28 > ) I used a third machine (using ath9k) to dump the traffic with airodump-ng. ARP requests are sent to broadcast address. - first I checked power save is off on the client (iw dev wlan0 set power_save off) - then I made static ARP entry on the client (arp -i wlan0 -s 172.28.120.1 00:22:B0:xx:xx:xx) Then I can see in the dump data packets going to the AP address, and the AP returns ACK packets. On AP, "tcpdump -i mon0" outputs one packet per second (corresponding with the ping), but "tcpdump -p -i wlan0" does not output anything at all. RX packet count in "ifconfig wlan0" output does not increase. on AP: # cd /sys/kernel/debug/ieee80211/phy0/stations/00* # grep . * agg_status:next dialog_token: 0x1 agg_status:(snip, all zeros) dev:wlan0 flags:AUTH flags:ASSOC flags:AUTHORIZED flags:SHORT PREAMBLE ht_capa:ht not supported inactive_ms:1160 last_seq_ctrl:ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff cc0 last_signal:-40 num_ps_buf_frames:0 rc_stats:(snip, all zeors) rc_stats:Total packet count:: ideal 2 lookaround 0 rx_bytes:1476 rx_dropped:80 rx_duplicates:0 rx_fragments:19 rx_packets:19 tx_bytes:2238 tx_filtered:0 tx_fragments:18 tx_packets:18 tx_retry_count:0 tx_retry_failed:0 wep_weak_iv_count:0 (rx_ + tx_packets does not increase with the ping) # cd /sys/kernel/debug/ieee80211/phy0/keys/18 (keys/18 appears after the station is connected) # grep . * algorithm:CCMP flags:0x1 hw_key_idx:0 ifindex:wlan0 key:1a62718edaf300998cc974f709a0baed keyidx:0 keylen:16 replays:1 rx_spec:000000000000 (snip repeats) tx_rx_count:18 tx_spec:000000000000 tx_rx_count increases with the ping HTH, Johannes -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
