Mailing List os2-wireless_users@2rosenthals.com Archived Message #5496 previous message next message back to list

From: "Lewis G Rosenthal" <os2-wireless_users@2rosenthals.com> Full Headers
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Sender: "OS/2 Wireless Users Mailing List" <os2-wireless_users@2rosenthals.com>
Subject: Re: [OS2Wireless] OT: Switch problem
Date: Wed, 05 Dec 2007 00:40:31 -0500
To: "OS/2 Wireless Users Mailing List" <os2-wireless_users@2rosenthals.com>

Hi, Jeff...

On 12/05/07 12:22 am, Jeffrey Race thus wrote :
Due to excess of accessories over number of ports on my dsl modem/router
(Speedstream 5681) I have interposed a GigaFast EZ500-S   10/100 Mbps
NWay Switch to serve a printer and computers.  These work fine, but my two
VoIP adapters cannot complete the login process so the VoIP numbers do
not function when their adapters' lan cables pass through the switch instead
of to the router directly.  The diagnostic message on the Linksys IP phone
display suggests it is stalling at a DNS lookup.

I'd appreciate if someone could either tell me what I am doing wrong, what
is the simple fix, or what more I need to read or do to educate myself to
diagnose and solve this kind of problem on my own.

  
Are the phones configured for DHCP? If so, are they able to obtain leases? If they are configured for static IP, can you ping them from something else on the network when they are connected to the switch?

In very rare instances, devices will refuse to work properly with particular switches. I have seen this with otherwise perfectly usable HP ProCurves, where certain Compaq (or HP!) Proliant servers simply refused to properly negotiate full duplex, forcing me to lock them down to half (switches are inhernetly full duplex capable devices, whereas hubs are half duplex). It is possible that the switch ports on your router are able to allow the phones to properly negotiate link speed and duplex, and the ports on the GigaFast for some reason are not. You might try substituting a different switch, but as long as you can get traffic to pass the switch, I see no valid reason why DNS (typically TCP port 53, or UDP port 53) would fail going through: a switch is not a firewall.

HTH

--
Lewis
------------------------------------------------------------
Lewis G Rosenthal, CNA, CLP, CLE
Rosenthal & Rosenthal, LLC
Accountants / Network Consultants
 New York / Northern Virginia           www.2rosenthals.com
eComStation Consultants                  www.ecomstation.com
Novell Users Int'l       www.novell.com/openenterpriseserver
Need a managed Wi-Fi hotspot?               www.hautspot.com
------------------------------------------------------------


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