[tcpdump-workers] Tcpdump not showing packets while the TX counter increments.

Matthew Schumacher matt.s at aptalaska.net
Tue Nov 11 14:22:49 EST 2014


Oh, sorry, that would have been helpful:

Slackware64-14.0

Linux 3.2.45 #2 SMP Fri May 31 20:14:55 CDT 2013 x86_64 Intel(R) Xeon(R)
CPU           X5550  @ 2.67GHz GenuineIntel GNU/Linux

glibc-2.15

I dug around in the kernel source looking for what exactly causes the
counter to increment, but it wasn't at all obvious what was going on.

Thanks for your help,
schu

On 11/10/2014 03:13 PM, Guy Harris wrote:
> 
> On Nov 10, 2014, at 2:17 PM, Matthew Schumacher <matt.s at aptalaska.net> wrote:
> 
>> I have an unprovisioned ethernet interface showing some TX packets:
>>
>> # ifconfig -a eth1
>> eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>        inet6 fe80::224:e8ff:fe80:9258  prefixlen 64  scopeid 0x20<link>
>>        ether 00:24:e8:80:92:58  txqueuelen 1000  (Ethernet)
>>        RX packets 1334743  bytes 124150467 (118.3 MiB)
>>        RX errors 0  dropped 128753314  overruns 0  frame 0
>>        TX packets 81  bytes 6380 (6.2 KiB)
>>        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>        device interrupt 48  memory 0xd8000000-d8012800
>>
>> But those aren't showing up with:
>>
>> # tcpdump -i eth1 -n -e -Q out
> 
> On what operating system is this?
> 


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