Re: help me please

[Miszcsi Miszcsi <miszcsike () yahoo com>]

Thanks! On the WAN or LAN interface ?

When I found the outgoing packet, it was from my external IP to Yahoo server. This is logic too to be in this way 
because of the NAT. 

But for final is not good the version with "host 192.168.0.1", because the main purpose of all stuff is to implement a 
pattern or list based content-filtering system for instant messaging on the gateway, I have more than 1 pc in the 
internal network and i should apply the content-filtering only to a part of them, not for all. In this context I need a 
more selective filter.

Miszcsi

--- On Mon, 4/19/10, dan meyer <dan () meyer-family net> wrote:

From: dan meyer <dan () meyer-family net>
Subject: Re: [Wireshark-users] help me please
To: "Community support list for Wireshark" <wireshark-users () wireshark org>
Date: Monday, April 19, 2010, 5:17 PM

I would use the capture filter string "host 192.168.0.1".
-- Dan Meyer 

On Mon, Apr 19, 2010 at 4:53 AM, Miszcsi Miszcsi <miszcsike () yahoo com> wrote:

Hello Everybody. Thanks Wes for help, it was very usefull, I got the right direction. The problem is that the host 
qualifier refers only as source to the IP adress and not as destination too. How can I make a capture filter for 
analysing both incoming and outgoing packets for a certain IP adress ? Using "and" and "src host"/"dst host" 
combinations can I build the filter ? 


Have a nice day

Miszcsi


--- On Sat, 4/17/10, Wes <wes_r () yahoo com> wrote:


From: Wes <wes_r () yahoo com>
Subject: Re: [Wireshark-users] help me please
To: "Community support list for Wireshark" <wireshark-users () wireshark org>

Date: Saturday, April 17, 2010, 1:37 PM


One way to attack this is to verify the sniffer is actually capturing the packets in question by doing a capture 
without a capture filter. Then you should be able to build a display filter to see only the packets you want. From 
that, you should be able to create a capture filter to capture just those packets.


Wes

--- On Sat, 4/17/10, Pedro Tumusok <pedro.tumusok () gmail com> wrote:


From: Pedro Tumusok <pedro.tumusok () gmail com>
Subject: Re: [Wireshark-users] help me please
To: "Community support list for
 Wireshark" <wireshark-users () wireshark org>
Date: Saturday, April 17, 2010, 9:09 AM

Why do you need the to use the HOST address as a qualifier?
Would not tcp port 5050 be
 enough? The reason is simple, because the internal host ip does not exist on the WAN (Internet) it means that this 
address is never in any packets that wireshark captures on the WAN interface. Have you tried to run the sniffer on the 
LAN interface?


Pedro

On Sat, Apr 17, 2010 at 12:29 PM, Miszcsi Miszcsi <miszcsike () yahoo com> wrote:



Hi 

How to figure out the combination ? For this I should visualize somehow the NAT table, but I dont know how to do this. 


Thanks

Miszcsi

PS I still need help in this problem :( Everybody on weekend holiday or sleeping ? :D Still stucked with the project... 

--- On Sat, 4/17/10, Jaap Keuter <jaap.keuter () xs4all nl> wrote:



From: Jaap Keuter <jaap.keuter () xs4all nl>
Subject: Re: [Wireshark-users] help me please

To: "Community support list for Wireshark" <wireshark-users () wireshark org>
Date: Saturday, April 17, 2010, 8:28 AM

Hi,

It seems like the NAT function is interfering with your capture filter. Maybe you can figure out what
 the exact address/port translation function is by looking at all WAN interface data. 
Thanks,Jaap

Send from my iPhone
On 17 apr 2010, at 10:09, Miszcsi Miszcsi <miszcsike () yahoo com> wrote:





Hello!
Please somebody help me with my problem !  I'm new in this and I'm stucked with my project because of this problem and 
I cannot going further. 
Any
 concrete and real help would be appreciated. 

I'm trying to monitor network traffic on windows gateway
with Wireshark, specially IM traffic, Yahoo Messenger. I have 2
fastethernet cards in the pc, one for WAN and one for LAN.
If I'm
running the sniffer on an internal pc, i have both incoming and
outgoing packets from and to yahoo server or in case of peertopeer
messaging to and from remote discussion partner.
If I'm running the
sniffer on the gateway using WAN interface for capture, I have only
incoming packets, and no outgoing. For filtering @capture I'm using the
option 
"tcp port 5050 and host X.X.X.X" where X.X.X.X is the IP adress of the internal pc.


(Wireshark - Capture Options - and I enter in the Capture Filter field this, after then Start)
I
have one staticly assigned real IP on the WAN, and dhcp assigned
private IP's for internal pcs (192.168.0.X), they are assigned based on
each pc's MAC adress, so they are constant and not interchanging. I'm using source NAT on WAN interface.

What I'm doing wrong or why outgoing packets doesn't appear in Wireshark ?

There is an example in Wireshark User's Guide from where I was inspired :


Example 4.1.  A capture filter for telnet that captures 
traffic to and from a particular host tcp port 23 and host 10.0.0.5

Please somebody explain what is the solution or the problem what 


makes that I see only incoming packets and nothing outgoing.

Best Regards 
Miszcsi









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-- 
Best regards / Mvh
Jan Pedro Tumusok


I know you love me
And you want to be Friends
And if you dont 
at least you need to pretend



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