> On Aug 14, 2016, at 6:20 AM, Anand Buddhdev wrote:
>
> Any ideas why tcpdump loses so many packets?
Saw your nanog posts...
How many RX queues are configured? What does 'ethtool -S p1p1' show? Any
discarded packets in the RX queue(s)?
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Hello,
I've found it is helpful to limit the length of the packet you are capturing by
using
something like -s 256.
On 08/14/2016 06:04 PM, Anand Buddhdev wrote:
On 14/08/16 12:20, Anand Buddhdev wrote:
Hi folks,
I've discovered something. See below:
The packet rate is also not that high.
On 14/08/16 12:20, Anand Buddhdev wrote:
Hi folks,
I've discovered something. See below:
> The packet rate is also not that high. From the sending side, this is
> what I have:
>
> # tcpreplay -i qtx:p1p1 5min.pcap
If I send packets without qtx, like this:
tcpreplay -i p1p1 5min.pcap
then tcp
Capturing 10 gigabit traffic with no packet loss at line speed is difficult
at best. Make sure that you've configured the IRQ affinity properly on the
sending and receiving sides to start.
On Aug 14, 2016 11:52 AM, "Gordon Messmer" wrote:
> On 08/14/2016 03:20 AM, Anand Buddhdev wrote:
>
>> The
On 08/14/2016 03:20 AM, Anand Buddhdev wrote:
The number 6882162 is exactly the number of DNS queries I am sending
from another server (the source). The filter is seeing them. However,
not all of them make it into the pcap file.
Try specifying "ether host " and compare the pcap files. How
are
Hi folks,
I've got a Dell R320 running CentOS 7, and a 10G NIC. I'm running a DNS
server on it, for testing. As part of my testing, I'm attempting to
capture all the DNS queries arriving on the server, using tcpdump.
However, tcpdump's performance is abysmal, and it loses lots of the
packets. Here
On Fri, Jan 14, 2011 at 08:21:23AM -0500, Kwan Lowe wrote:
> On Fri, Jan 14, 2011 at 5:28 AM, Giles Coochey wrote:
> >>How can I dump every packets received by filter ?
> >
> > I use the following command to make packet captures:
> >
> > tcpdump -i eth0 -s 0 -w capture.cap
> >
> > It creates a fil
On Fri, Jan 14, 2011 at 5:28 AM, Giles Coochey wrote:
>>How can I dump every packets received by filter ?
>
> I use the following command to make packet captures:
>
> tcpdump -i eth0 -s 0 -w capture.cap
>
> It creates a file capture.cap that can be read by a packet analyzer - e.g.
> wireshark.
I
On 14/01/2011 11:26, admin lewis wrote:
Hi,
My server is connected to the lan and when I run tcpdump I see few
packets captured but lots packets received by filter.
How can I dump every packets received by filter ?
I use the following command to make packet captures:
tcpdump -i eth0 -s 0 -w c
Hi,
My server is connected to the lan and when I run tcpdump I see few packets
captured but lots packets received by filter.
How can I dump every packets received by filter ?
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Am 20.02.2010 07:03, schrieb Hadi Motamedi:
>
> Dear All
>
> I have put tcpdump trace on port 4957 on my CentOS server , as the following :
>
> #tcpdump port 4957
>
> I want to obtain the payload data to see what is realy being exchanged
> between my CentOS server and the outside network eleme
use -i ex. tcpdump -i eth0 port 4957 -nn -vv etc.
man tcpdump for more options.
--
Andrei
2010/2/20 Hadi Motamedi
> Dear All
> I have put tcpdump trace on port 4957 on my CentOS server , as the
> following :
> #tcpdump port 4957
> I want to obtain the payload data to see what is realy being
Dear All
I have put tcpdump trace on port 4957 on my CentOS server , as the following :
#tcpdump port 4957
I want to obtain the payload data to see what is realy being exchanged between
my CentOS server and the outside network element . Can you please let me know
how I can modify my command ?
I have an issue with only a few domains sending mail to a company's exchange
server.
Topology is as follows:
Internet -> PIX -> logical interface / vlan -> HP switch (interface tagged into
applicable vlan) -> ESXi server -> vm (ASSP/CentOS Postfix MTA) -> HP switch
(out of vlan) -> physical HP s
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