atheros (ath) - duplicate packets with long distance link

Johann Hugo jhugo at icomtek.csir.co.za
Mon Nov 24 12:06:09 PST 2003


On Monday 24 November 2003 21:22, Sam Leffler wrote:
> tcpdump -e -i ath0 -y IEEE802_11
>
> and verify the 802.11 frames are actual duplicates.  They should not be
> unless there's a bug in the duplicate suppression logic in the 802.11 code.

The packets are definately from the same host. Will it help if I recompile with 
AR_DEBUG turned on ?

PING 192.168.10.10 (192.168.10.10): 56 data bytes
64 bytes from 192.168.10.10: icmp_seq=0 ttl=64 time=4.373 ms
64 bytes from 192.168.10.10: icmp_seq=0 ttl=64 time=74.278 ms (DUP!)
64 bytes from 192.168.10.10: icmp_seq=1 ttl=64 time=2.646 ms
64 bytes from 192.168.10.10: icmp_seq=1 ttl=64 time=83.930 ms (DUP!)
64 bytes from 192.168.10.10: icmp_seq=2 ttl=64 time=2.631 ms
64 bytes from 192.168.10.10: icmp_seq=3 ttl=64 time=4.127 ms

atheros# tcpdump -e -i ath0 -y IEEE802_11 proto ICMP
tcpdump: data link type DLT_IEEE802_11
tcpdump: listening on ath0
00:04:57.452451 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:f0:4 DA:0:5:5d:95:ef:2c 192.1
68.10.20 > 192.168.10.10: icmp: echo request
00:04:57.455152 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.457598 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.461559 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.467485 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.478495 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.483984 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.490683 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.509604 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.531031 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.546951 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:57.557694 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.469354 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:f0:4 DA:0:5:5d:95:ef:2c 192.1
68.10.20 > 192.168.10.10: icmp: echo request
00:04:58.473004 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.476335 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.488546 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.508876 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.521360 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.528470 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.537460 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.547434 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:58.551423 DA:0:5:5d:95:f0:4 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:ef:2c 192.1
68.10.10 > 192.168.10.20: icmp: echo reply
00:04:59.479303 BSSID:0:5:5d:95:ef:2c SA:0:5:5d:95:f0:4 DA:0:5:5d:95:ef:2c 192.1
68.10.20 > 192.168.10.10: icmp: echo request

Johann


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