RE: [cobalt-users] Cube 3 smtp problems

["Brian Poppenwimer" <popper@xxxxxxxxxxxxxxx>]

Hey!
Could it be the standard reverse lookup issue?  When you send mail it will
hang until a timeout is reached because the server is trying to do a reverse
lookup on the client's ip address.  If your internal network uses the
standard non routable ips, then they aren't defined anywhere and the server
won't know who you are.  You fix this by defining your internal network's
ips in the /etc/host file in the following format:

[admin /etc]$ cat hosts
# /etc/hosts
# Auto-generated file.  Keep your customizations at the bottom of this file.
127.0.0.1               localhost localhost.localdomain
192.168.X.X             mail.np-npv.com mail
XXX.XXX.XXX.XXX         mail-eth1.np-npv.com mail-eth1
#END of auto-generated code.  Customize beneath this line.

192.168.1.100   int00.np-npv.com        int00
192.168.1.101   int01.np-npv.com        int01
192.168.1.102   int02.np-npv.com        int02
192.168.1.103   int03.np-npv.com        int03
192.168.1.104   int04.np-npv.com        int04
192.168.1.105   int05.np-npv.com        int05
192.168.1.106   int06.np-npv.com        int06
192.168.1.107   int07.np-npv.com        int07

Hope this Helps
---Brian
------------------------------
Brian R. Poppenwimer, CNE, MCP
Director of Computer Operations
Nelson & Pope
www.nelsonpope.com 

-----Original Message-----
From: cobalt-users-admin@xxxxxxxxxxxxxxx
[mailto:cobalt-users-admin@xxxxxxxxxxxxxxx] On Behalf Of pwilliams
Sent: Monday, October 20, 2003 7:52 AM
To: cobalt-users@xxxxxxxxxxxxxxx
Subject: RE: [cobalt-users] Cube 3 smtp problems


Hi

Well I have undertaken some more tests

The issue appears to be the mail client Outlook is sending SMTP requests
to the cube, (I used a sniffer and confirmed this and saw the successful
transmission of an email) which appears to ignore them (giving a time
out) until a random point (from a couple of minutes to over an hour)
when it will connect, send the mail and then collect the POP mail

Is there a tool I use use (ala fetchmail) to understand the dialogue and
what is happening?

Also if I login via telnet to the SMTP server, all works fine

Yours in a reducing circle of sanity

Peter



-----Original Message-----
From: cobalt-users-admin@xxxxxxxxxxxxxxx
[mailto:cobalt-users-admin@xxxxxxxxxxxxxxx] On Behalf Of Gerald Waugh
Sent: Friday, October 10, 2003 8:38 PM
To: cobalt-users@xxxxxxxxxxxxxxx
Subject: RE: [cobalt-users] Cube 3 smtp access problems


On Fri, 10 Oct 2003, peter williams wrote:
>
> Thanks but there is plenty of bandwith available.
>
> I suspect it might be a DNS issue, in that the clinet cant find the 
> server, yet at other times the mail flows just fine....frustrating!

check the reverse,
dig -x ip.add.re.ss

There must be an ANSWER, it may not be correct, but the key is there is
an ANSWER.

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44795
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2

versus
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 36393
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

Note: "ANSWER: 2" on the first example and "ANSWER: 0" on the second
example.

Also when you run "dig -x" note the huge delay when digging an ip with
"ANSWER: 0"

Gerald
--
http://frontstreetnetworks.com | http://store.raqware.com
  Front Street Networks LLC, 229 Front Street, Ste.#C
  New Haven, CT 06513-3203 | phone: +1-203-785-0699

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