Re: DNS settings

"SP" <anon@xxxxxxx> wrote in message
news:emJTkshQFHA.3868@xxxxxxxxxxxxxxxxxxxxxxx
> Really appreciate your valuable tips.
>
> Ok, so for our case, once Address Record (A) gets a new IP, all CNAMEs
will
> follow.

Yes, because each CNAME points to an A (name).


> For the email server and the MX record, I guess to further understand it,
> I'd like to change this scenario. That is, ok ... so the website will get
a
> new IP. The email server will also be hosted elsewhere (say, you run the
> server for us wherever you are).

Perfectly fine, but wherever the SMTP server is,
it needs an MX record and in the reverse zone it
needs to have the same name.

> How will the MX record will be ?

SMTP Server (the software itself) reports a name
to other SMTP servers when transferring email.

It has to use an IP assigned to the machine -- that
IP must reverse to the MX name above.

The MX records for YOUR zone must match this
record name even if the SMTP server is in MY
zone. (One SMTP server can handle mail for many
companies.)




> Steve
>
> "Herb Martin" <news@xxxxxxxxxxxxxx> wrote in message
> news:u$QnlqgQFHA.3288@xxxxxxxxxxxxxxxxxxxxxxx
> > "SP" <anon@xxxxxxx> wrote in message
> > news:#SfdqWfQFHA.580@xxxxxxxxxxxxxxxxxxxxxxx
> >> Very helpful, your info. Thank you
> >>
> >> If I change the A and the WWW records, what happen to all the CNAME
> > entries
> >> (if I leave them as-is). Don't they follow domainname.com if
> > domainname.com
> >> gets a new IP ?
> >
> > CNAMEs will follow their A records -- this is half the
> > point of a CNAME record (otherwise you could just make
> > additional A records with the same IPs.)
> >
> >> As for the MX record, since the first A record will be changed from
> >> 111.111.111.111 to 222.222.222.222, the MX record host=domainname.com
> >> will
> >> need to be changed to host=111.111., right ??
> >
> > No, because MX records map from a "domain" name to
> > a servder NAME (or should) -- there shouldn't be any
> > addresses involved in an MX record.
> >
> > MX is just another (speciail) form of alias similar to CNAME
> > but specific to SMTP email only.
> >
> >> TTL: nope I didn't leave anything out. What you see is what I got.
> >> Maybe
> > I
> >> don't have access to change TTL. Or maybe it is not at the same
> >> interface
> >> where I got these DNS records.
> >
> > Some interfaces may not allow that (especially if it is a
> > custom web form) -- Check to see if you have access to
> > the SOA record.
> >
> > If your TTL (even the default on the SOA) is set to two
> > days and you change addresses it will be up to 2 days before
> > your customers/clients/users catch up with you.
> >
> >> Steve
> >>
> >>
> >> "Herb Martin" <news@xxxxxxxxxxxxxx> wrote in message
> >> news:u3Q1jmQQFHA.3628@xxxxxxxxxxxxxxxxxxxxxxx
> >> > "SP" <none> wrote in message
> > news:OxeTTGNQFHA.128@xxxxxxxxxxxxxxxxxxxxxxx
> >> >> Our website and email DNS settings are registered at hosting company
> >> > (where
> >> >> we have access to modify).
> >> >>
> >> >> The website and email server are currently hosted there.
Eventually,
> > we
> >> >> will have the website hosted in-house on one of our new SBSs, but
the
> >> > email
> >> >> server will remain at the hosting company.
> >> >>
> >> >> How do I change the DNS settings for this to work ?
> >> >
> >> > Do you mean physically? Through what ever method
> >> > they supply -- usuall 'access' means a web page, but
> >> > many ISPs require you to send an email.
> >> >
> >> > If you mean what values do you use, then just change
> >> > the A records for the WWW (or other) host records
> >> > to use the new values.
> >> >
> >> > (Best is to keep old web server up until change takes
> >> > effect -- clients will visit old until DNS sends them
> >> > to new.)
> >> >
> >> >> And how long does it
> >> >> take for the settings to go into effect ?
> >> >
> >> > Depends on the ISP and method of change (direct
> >> > or queued for later update etc.) -- usually overnight
> >> > is the worst case or get another ISP.
> >> >
> >> > I strongly recommend having the external DNS for
> >> > all but largest companies at the REGISTRAR (not
> >> > the ISP) but if your happy then there is no hurry or
> >> > perhaps no need to move it back there.
> >> >
> >> > Also note: You should plan (ahead) to reduce the
> >> > TTL (to a few minutes to an hour max) before making
> >> > such changes -- otherwise those caching your records
> >> > can continue to do so for up to TTL time.
> >> >
> >> > TTL is a default setting on an entire DNS zone or a
> >> > specific override on each individual resource record.
> >> >
> >> > Since I don't see any TTL below (you may have omitted
> >> > them when editing) then it is likely only set on the SOA
> >> > record (the default.)
> >> >
> >> >> Here is a sample of DNS entries for our site (with 111.111.111.111
> > being
> >> > the
> >> >> domain IP).
> >> >>
> >> >> domainname.com. Address Record (A) 111.111.111.111
> >> >>
> >> >> localhost.domainname.com. Address Record (A) 127.0.0.1
> >> >>
> >> >> ftp.domainname.com. Canonical Name (CNAME) domainname.com.
> >> >>
> >> >> pop.domainname.com. Canonical Name (CNAME) domainname.com.
> >> >>
> >> >> smtp.domainname.com. Canonical Name (CNAME) domainname.com.
> >> >>
> >> >> www.domainname.com. Canonical Name (CNAME) domainname.com.
> >> >>
> >> >> domainname.com. Mail Exchange Record (MX) preference=10,
> >> >> host=domainname.com.
> >> >>
> >> >> imap.domainname.com. Canonical Name (CNAME) domainname.com.
> >> >>
> >> >> news.domainname.com. Canonical Name (CNAME) domainname.com.
> >> >>
> >> >>
> >> >>
> >> >> If the web server's new domain IP will be 222.222.222.222, please
> >> >> indicate
> >> >> changes for the above entries to point the web server to the new IP
> > while
> >> >> keeping the email server with the old IP.
> >> >>
> >> >>
> >> >>
> >> >> Your help is really appreciated.
> >> >>
> >> >> Steve
> >> >>
> >> >>
> >> >
> >> >
> >>
> >>
> >
> >
>
>


.

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