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Wireshark-users: Re: [Wireshark-users] Terminal Server traffic

From: Jaap Keuter <jaap.keuter@xxxxxxxxx>
Date: Wed, 12 Mar 2008 07:35:04 +0100
Hi,

When I switch off the TCP dissector preference "analyze TCP sequence numbers", all that is left are duplicate packets for the vlan. Apply this filter to see:
ip.src == 10.10.10.0/24 && ip.dst == 10.10.10.0/24

Thanx,
Jaap

Albert Jurado wrote:
I've attached a small capture file.  Maybe someone can take a look at it and make something of it.

If you look for the following ip address (10.10.10.23) you'll should see the out of order packets.

Albert Jurado
Network Manager
First Commercial Insurance Company 2300 W 84 St.
Hialeah, FL 33016
Phone: (305) 820-4848 ex. 1206
Mobile: (305) 873-4400
Email:  ajurado@xxxxxxxxxxxxxxxx
-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Jaap Keuter
Sent: Monday, March 10, 2008 7:38 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] Terminal Server traffic

Hi,

Well a packet coming in has to come out somewhere. If the router passes them both to the sniffer you'll see it twice (with a different MAC address, of course, and maybe a different VLAN tag, and a TTL-1, but still.

Thanx,
Jaap

Albert Jurado wrote:
Why would it see double?

Albert Jurado
Network Manager
First Commercial Insurance Company 2300 W 84 St.
Hialeah, FL 33016
Phone: (305) 820-4848 ex. 1206
Mobile: (305) 873-4400
Email:  ajurado@xxxxxxxxxxxxxxxx
-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Jaap Keuter
Sent: Monday, March 10, 2008 1:31 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] Terminal Server traffic

Hi,

I may be dependant how you configured the monitoring port on the core router. If it captures both ingress and egress packets it start to see double. The details I leave to the network operator buffs ;) .

Thanx,
Jaap

Albert Jurado wrote:
As of last week we started to monitor traffic from our internal Terminal Server to our internal SQL server using wireshark.

Our network is segmented in the following way:

VLAN for servers

Data VLAN for each floor in the building (six in total).

We installed wireshark on a separate workstation plugged into our core router with a monitoring port configured

Our first capture revealed over 40% of the traffic as “out-of-order” packets. When we performed a capture from the terminal server there was no such traffic. I wondering if this type of behavior is normal for terminal server communication. I hope someone can shed some light on this matter for me, it would greatly appreciated.

Thanks!

*Albert Jurado*