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At 3:46 AM -0700 5/23/00, Micaela Carr wrote:
Re: TCP/IP stack/SMTP
From: Men & Mice Support
Date: Wednesday, May 24, 2000
Time: 1:45:45 am
>> ....The problem wasn't QuickDNS,
>> but the TCP/IP stack, which had become corrupted. Nothing crashed,
>> but the machine was deaf to the network.
>
>Question 1:
>re the above--
>Setup: G4, Mac OS 9.0.4, QuickDNS, AppleShare IP 6.3.1
>My mailserver was crashing 5-6x/week, was extremely slow to accept mail from
>the clients, and then went deaf on the network!, so I upgraded it to OS
>9.0.4 from 9.0.2, and to ASIP 6.3.1 from 6.3 and it seemed to work for a few
>hours, then crashed quite permanently it seemed, so I rebuilt it. (I know
>this is extreme behaviour but I am the help-desk/hw/sw person for our entire
>little company, and they keep me way too busy!) It is working now, but is
>VERY sluggish, not accepting mail quickly at all, and not responding to
>queries by my remote (on the LAN) server admin program very quickly either.
>
>Is it possible that the TCP/IP stack got corrupted as mentioned above? And
>if that is possible, how do you fix it?
You can fix a corrupted TCP/IP stack by rebooting the machine. If the
problem persists past that point, then the problem isn't a corrupted
TCP/IP stack.
I suggest you ask Apple Tech Support about why ASIP is responding slowly.
>If it is an SMTP problem, as I got some indication that it was not
>"understanding" SMTP, how would that be tracked down? Sorry to ask such
>simple questions.
Sounds like you've been using DNS Expert. DNS Expert reports that a
mail server doesn't understand SMTP if that server doesn't respond
according to the SMTP standard. This might including not responding
quickly enough - DNS Expert doesn't distinguish between a failure to
respond correctly and a failure to respond at all, once the initial
connection has been created.
>Question 2:
>I am adding another mail server but am wondering how I would set up DNS for
>this -- we are using NAT, and mail is pointed by our firewall, and by QDNS
>to a particular machine on the network 192.168.100.27. QDNS is currently on
>another host.
>
>Do I need to add a secondary DNS server? -and how do you designate it as
>secondary? is it just the way you set up the records?
How many public IP addresses do you have? This tells you how many
mail servers you can have that the public can reach directly. It also
tells you how many public DNS servers you can have. However, with the
aid of your NAT server, those services don't have to be run on the
same machine(s) (as you have discovered).
A secondary DNS server is simply a DNS server that gets its domain
data from another server, usually a primary server.
To set up the DNS records for a second mail server, you first have to
decide how you want to use this server. If it is simply to be a
backup mail server, then:
o Duplicate your existing MX record.
o In the duplicate record, increase the value in the Parameter 1 column.
o Also in the duplicate record, change the Parameter 2 column to
point to the name of the new mail server.
Make sure you have an A record for the new mail server as well, using
the name you used in the new MX record.
If you want to do something else with your new mail server, you'll
have to tell us what it is.
____________________________________________________________________
Chris Buxton cbuxton@menandmice.com
Men & Mice http://www.menandmice.com
Makers of: QuickDNS Pro
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