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Date: Sun, 12 Aug 2007 17:10:25 -0400
From: "Lewis G Rosenthal" <os2-wireless_users@2rosenthals.com>
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Subject: Re: [OS2Wireless] VPC under eCS on TP

Hi, Hakan. Sorry to be coming so late to the party...

I'm in the process of re-installing VPC on my T43 right now (need to 
reboot), but I wanted to throw a couple things out for general 
consumption...

   1. Under Windows, the command to display your routing table is

          route print <Enter>

   2.  To get to your local systems, a default route is not needed (if
      using Virtual Switch), as you are staying on your local network.
   3. Try to ping the IP address of your local machine, as assigned
      under eCS. This should give us an idea as to whether traffic is
      moving between the virtual machine and the physical one.
   4. It is indeed possible to obtain an IP address form a DHCP request
      and still not be able to get any traffic to pass. I see this *from
      time to time* particularly when troubleshooting wireless networks.
   5. Can you ping the VPC guest address from the VPC host?
   6. I take it that you are attempting to ping addresses and not names.
      Name resolution is a completely different matter (obviously).
   7. Dump your ARP table from the VPC guest to see what you've got:

          arp -a <Enter>

   8. Check the arp tables in your other machines on the network and see
      if they have entries for your virtual machine listed. Try pinging
      your virtual machine IP from other machines (assuming a ping from
      the host is successful) to populate the arp tables on those other
      machines.
   9. I hope you are using Virtual Switch on your wired interface and
      not on your wireless one, as Virtual Switch *does not work
      reliably* over 802.11 links. I had some discussion with Achim a
      few years ago in this regard, but as VPC was (by necessity)
      discontinued, the issue (an enhancement request, actually, as this
      was not a bug, but a known condition) was never addressed.
  10. Are you certain that you do not have another DHCP server anywhere
      on your network which could be assigning duplicate addresses (see
      point 4, above, as this is a common cause).

A couple quick links, as I had them handy:

http://www.dhcp-handbook.com/dhcp_faq.html
http://www.apps.ietf.org/rfc/rfc1531.html

The above are related to DHCP specifically, and not to troubleshooting  
TCP/IP in general.

More suggestions later.

-- 
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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