Thanks Gary!
Tracy Johnson
+00 1 757 766-4318 tel
+00 1 757 755-6470 mobile
Hampton, Virginia, U.S.
[log in to unmask]
> -----Original Message-----
> From: HP-3000 Systems Discussion <[log in to unmask]> On Behalf Of Gary
> Stephens
> Sent: Thursday, December 27, 2018 6:11 PM
> To: [log in to unmask]
> Subject: Re: [HP3000-L] Flipping IPs on a an SMTP Relay
>
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> ________________________________
>
> I would probably point at a known dns dns rather than try and resolve
> locally, I never had too much luck in exactly this situation. My sends were
> going to a secure gateway that would flip every 60 seconds, Pm me if you get
> stuck and want some more info, it was a pain as I recall and didn’t resolve
> on the 3000 in the end, problem was made worse due to L2 MAC address tables
> thinking the same address was on 2 different ports - that’s worth checking.
>
> For starters remove the entry from the hosts file assuming it is resolvable
> - if not resolvable it can be a real pita
>
>
> Sent from my iPhone
>
> > On 27 Dec 2018, at 22:55, Tracy Johnson <[log in to unmask]> wrote:
> >
> > I have an internal SMTP relay at work and its DNS flips the IP address
> back
> > and forth every few minutes. Example:
> >
> > One minute it could be x.x.8.133
> >
> > Next minute it could be x.x.72.138
> >
> > (First two octets omitted to protect the guilty.)
> >
> > I can reproduce the above result at will with simple pings.
> >
> > I presume it is load balancing technique our network propeller-heads
> cooked
> > up. But on our HP3000 host there is only one IP plugged into the
> HOSTS.NET
> > file.
> >
> > (And of course the propeller-heads never told us this.)
> >
> > Could it be causing SMTP errors on our HP3000?
> >
> > To take it even further, if they take one of the two above relays down for
> > a bit of maintenance (say nightly), and it happens to be the one our
> HP3000
> > is using on its HOSTS.NET file, would that also cause SMTP errors?
> >
> > And may I presume the HOSTS.NET file has only room for one IP address in
> > column 1?
> >
> > --
> >
> > Tracy Johnson
> > Old fashioned text games hosted below:
> > http://empire.openmpe.com/empire/
> > BT
> >
> >
> >
> >
> >
> >
> >
> > NNNN
> >
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