Wireshark-users: Re: [Wireshark-users] Ping Replys without Request
From: "STEINECKE Michael SD-G (AREVA NP GmbH)" <Michael.Steinecke@xxxxxxxxx>
Date: Wed, 30 Aug 2006 14:56:57 +0200
Hello Petr,

you mean if displayed the MAC-adress resolution instead of the MAC-adress?
Then thea answer is yes. But this is only a setting in wireshark i think.

Michael Steinecke

> -----Ursprüngliche Nachricht-----
> Von: wireshark-users-bounces@xxxxxxxxxxxxx 
> [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] Im Auftrag von 
> Petr Vácha
> Gesendet: Dienstag, 29. August 2006 10:51
> An: Community support list for Wireshark
> Betreff: Re: [Wireshark-users] Ping Replys without Request
> 
> Hello,
> we have come up with the similar problem once, but I need you 
> to answer the following question to see if it's really the 
> same situation:
> 
> Are MAC address in the ICMP packet really present in your 
> network or are they something like DigitalEquipment_00-02-01 
> (one such is the source and one is the destination)? 
> 
> Petr Vacha
> 
> > -----Original Message-----
> > From: wireshark-users-bounces@xxxxxxxxxxxxx
> > [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of 
> Jim Young
> > Sent: Monday, August 28, 2006 5:25 PM
> > To: wireshark-users@xxxxxxxxxxxxx
> > Subject: Re: [Wireshark-users] Ping Replys without Request
> > 
> > Hello Michael,
> > 
> > >>> "STEINECKE Michael SD-G (AREVA NP GmbH)"
> > <Michael.Steinecke@xxxxxxxxx> 08/28/06 4:33 AM >>>
> > > Hello folks,
> > > 
> > > i've a bit strange issue in the communication between a Server and
> > his
> > > client (a microcontroler).
> > > The controler send "Echo Reply" packets without a corresponding
> > ICMP
> > > requests. Is there another way how this can happen then an program
> > or
> > > firmware error? Something like an TCP packet that requests a ICMP
> > Echo
> > > par example?
> > > 
> > > Best Regards
> > > Michael Steinecke
> > 
> > Does you controller have multiple NIC interfaces?  If so, then 
> > depending on how you've set up your route statements on the 
> controller 
> > (assuming that you can) it's possible that replies received 
> on one NIC 
> > interface will be returned out a different
> > NIC interface.   IP addresses more than one hop away could 
> > be taking a "default" route (out the NIC interface towards your 
> > server).
> > 
> > Take a look at the destination IP address (where the ping reply is 
> > supposed to go to) and the destination MAC address for the 
> ping reply.  
> > This should give you a clue on who/what might be generating the 
> > original request.
> > 
> > Then again if it's some type of specialized controller, then I 
> > wouldn't be surprised to see the vendor doing something 
> non-conventual 
> > like using ICMP echo replies to send signalling
> > information to some other station(s).   
> > 
> > I've also seen some devices that use an an undocumented private NIC 
> > setup internally.  I've had a few occasions where these back-end 
> > packets have leaked out the one public NIC.
> > 
> > I hope this find this useful.
> > 
> > Jim Young
> > 
> > 
> > 
> > _______________________________________________
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> > Wireshark-users@xxxxxxxxxxxxx
> > http://www.wireshark.org/mailman/listinfo/wireshark-users
> > 
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