Here's some more:

16:03:05.393873 00:16:44:c6:4f:f4 (oui Unknown) > 00:26:08:e9:8a:bc (oui 
Unknown), ethertype IPv4 (0x0800), length 1514: 
toil.robots.cse.wustl.edu.53552 > 192.168.1.115.49680: . 
1130888:1132336(1448) ack 1 win 108 <nop,nop,timestamp 5842447 497191153>
16:03:05.393892 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
toil.robots.cse.wustl.edu.53552: . ack 1133784 win 65535 
<nop,nop,timestamp 497191169 5842447>
16:03:05.394168 00:16:44:c6:4f:f4 (oui Unknown) > 00:26:08:e9:8a:bc (oui 
Unknown), ethertype IPv4 (0x0800), length 1514: 
toil.robots.cse.wustl.edu.53552 > 192.168.1.115.49680: . 
1132336:1133784(1448) ack 1 win 108 <nop,nop,timestamp 5842456 497191153>
16:03:05.394182 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
toil.robots.cse.wustl.edu.53552: . ack 1133784 win 65535 
<nop,nop,timestamp 497191169 5842456>
16:03:05.394233 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
toil.robots.cse.wustl.edu.53552: . ack 1129440 win 65535 
<nop,nop,timestamp 497191168 5842437>
16:03:05.394353 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.62595 > 
toil.robots.cse.wustl.edu.ssh: . ack 752 win 33304 <nop,nop,timestamp 
497191168 5842439>
16:03:05.394458 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
toil.robots.cse.wustl.edu.53552: . ack 1130888 win 65535 
<nop,nop,timestamp 497191168 5842447>
16:03:05.394563 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
toil.robots.cse.wustl.edu.53552: . ack 1133784 win 65535 
<nop,nop,timestamp 497191169 5842447>
16:03:05.395265 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
Unknown), ethertype IPv4 (0x0800), length 98: 192.168.1.115 > 
toil.robots.cse.wustl.edu: ICMP echo request, id 12823, seq 5952, length 64

-Dan

On 4/9/10 3:56 PM, Blaise Gassend wrote:
>> The man file isn't particularly useful for figuring out how what the
>> output means, so here is a few lines:
>>
>> 15:04:57.045705 IP toil.robots.cse.wustl.edu.53552>
>> 192.168.1.115.49680: . 931064:932512(1448) ack 1 win 108
>> <nop,nop,timestamp 4970372 497156321>
>> 15:04:57.045710 IP 192.168.1.115.49680>
>> toil.robots.cse.wustl.edu.53552: . ack 931064 win 33304
>> <nop,nop,timestamp 497156335 4970352>
>> 15:04:57.045711 IP 192.168.1.1.http>  192.168.1.115.49706: P 1:351(350)
>> ack 597 win 6556<nop,nop,timestamp 172066583 497156334>
>> 15:04:57.045777 IP 192.168.1.115.49680>
>> toil.robots.cse.wustl.edu.53552: . ack 933960 win 33304
>> <nop,nop,timestamp 497156335 4970372>
>> 15:04:57.045809 IP 192.168.1.115.49706>  192.168.1.1.http: . ack 351 win
>> 33129<nop,nop,timestamp 497156335 172066583>
>>      
>>> Have you tried using compressed image transports?
>>>        
> Strange, I have never seen tcpdump not print packet lengths. Try adding
> -e.
>
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