Greetings,

I have a 4621SW at my desk.  I had to write the configuration file from scratch 
and in doing so read through a LOT of Avaya documentation.

Without doing 802.1x, you'll have to setup the phone to tag the traffic to put 
it in a different VLAN.

You'll need something like this in your phone configuration to set the 
secondary (PC) port on the phone to the correct VLAN:
SET VLANSEP 1
SET L2QVLAN Y
SET PHY2VLAN X 

X=data vlan
Y=voice vlan

I don't know if this will resolve your initial question regarding DNS.  I am 
guessing you're having some VLANing issues.

I suggest reworking that site to use 802.1x so your Enterasys switch can 
differentiate between phones and PCs.  Then you can trust the Enterasys to do 
the work for you.

www.avayausers.com is a pretty good resource for Avaya related technical 
questions.



Thanks,

Lou Goddard

Network Engineer

302-552-8053

[email protected]

From: Andy Middlehurst <[email protected]>
Sent: Thu, 7/8/2010 9:33am
To: Enterasys Customer Mailing List <[email protected]>
Subject: RE: [enterasys] DNS issue with PC connected to Avaya IP phone 
passthru...





Nick,


 


One further thought is whether or not the phones “switch” is
enabled.  If it works direct, but not through a phone, I’d say the problem is
the phone!


 


Set up a port mirror so you can capture traffic to an analyser
and see what you get from the PC.


 


Andy


 


 






From: Nick Allen
[mailto:[email protected]] 

Sent: 08 July 2010 14:18

To: Enterasys Customer Mailing List

Subject: RE: [enterasys] DNS issue with PC connected to Avaya IP phone
passthru...






 


Hi Patrick,


 


Phone and PC have different IP addresses.


We don't use 802.1x or any auth like that - is that what you
meant?


 


N.


 


 








From: Patrick
Printz [mailto:[email protected]] 

Sent: 08 July 2010 13:04

To: Enterasys Customer Mailing List

Subject: RE: [enterasys] DNS issue with PC connected to Avaya IP phone
passthru...


On the switch, does it see both the PC and the phone and that
each has authenticated properly? On the PC, what IP does it say it has in an 
ipconfig?
Is it the same as the phone?


 




 


Patrick Printz


Network Services


 


Quinsigamond Community College

670 West Boylston Street

Worcester, MA 01606-2092 


w. 508-854-7517


c. 508-726-9529


 


 


"If a man is called a streetsweeper, he should sweep
streets even as Michelangelo painted, or Beethoven composed music, or
Shakespeare wrote poetry.  He should sweep streets so well that all the
hosts of heaven and Earth will pause to say, Here lived a great streetsweeper
who did his job well."


~Martin Luther King, Jr. 




 






From: Nick Allen
[mailto:[email protected]] 

Sent: Thursday, July 08, 2010 7:55 AM

To: Enterasys Customer Mailing List

Subject: [enterasys] DNS issue with PC connected to Avaya IP phone
passthru...






 




Hi,






 






An
odd issue has been reported on one of our remote sites in Manchester.






 






They
have a C2H124-48P with a number of Avaya 9630G IP Phones.






 






When
they connect a PC directly to the switch, that PC's hostname is registered
correctly on the DNS server.






However,
when the PC is connected via the passthru in the back of the phone, although
the phone registers itself ok in DNS, the PC doesn't.






 






I
don't have software and firmware revisions to hand but everything is pretty
recent - just thought I'd ask to see if anyone had encountered a similar issue?






 






One
thing that differs from our site here in London (where we don't have the issue)
is that we have a Voice VLAN and a Data VLAN to separate the traffic, whereas
in Manchester, at the moment everything's on the same default VLAN.






 






Another
thing is that the Enterasys switch is linked to a Netgear core switch (don't
ask).






 






We
could obviously do packet traces but as we'll have to talk them through doing
that, thought it worth asking the list first if anyone has ever encountered a
similar issue or can think of any logical reason why this might be so?






 






It
could be an Avaya issue I know, but trying all angles.






 






Thanks,






 






Nick.






 






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