Re: Can't VPN or RD for 5 min. after logon?

From: Vincent Fatica (abuse_at_localhost.com)
Date: 08/27/04 

Date: Fri, 27 Aug 2004 02:07:13 GMT

I should start this thread over because I find it doesn't have anything
to do with SP2. Maybe I'm just missing something very general about
networking. I have now observed the problem (if it is indeed a problem)
on three machines and with XP SP0, SP1, and SP2. One machine (at work)
has a static IP; two machines at home have indepentent DHCP assigned
(RoadRunner) IPs and are connected to the cable modem by a switch.
There are no firewalls of any kind, and no personal routers involved.

What I notice is that after a restart/logon, I can (using SMTP as an
example)

        telnet host 25

**immediately** only if "host" is in my domain. The very same thing
will fail for 3-7 minutes if "host" is not in my domain. The same goes
for some other protocols (NNTP, FTP, VPN, and RD have been tested).
HTTP is a bit different. On the home machines I have immediate HTTP to
anywhere; on the work machine, HTTP outside its domain is delayed.
After that initial delay, there's no problem connection anywhere by any
means.

I have also noticed this. When the local machine is at home, and the
remote machine is the one at work, and I try "telnet work_machine 25",
the initial SYN is sent; it is received at the far end, and the remote
host responds (according to remote NetMon). But the local computer does
not receive the response (according to local NetMon). So I figure that
either (1) the response really didn't get here, or (2) it did arrive,
but XP didn't do the right thing with it. I have tried that same test
in the opposite direction as well (while sitting at the work machine);
the resluts were the same. In all cases, right after a restart/logon, I
have immediate connectivity to hosts in my domain, and no connectivity
to hosts outside my domain for a period of 3-7 minutes. So I wonder, is
this in any way normal? Is it a quirk of XP? When a machine is turned
on, does it need to tell the network "hey, I'm here; you can relay
packets to me"? Does anyone know what's going on? Thanks. 

-- 
 - Vince
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