Re: [Staffslug] Setting up linux server behind NAT
> > On 19/03/2008, Adam Sweet <adam(a)adamsweet.org> wrote:
> >
> > 'An excellent HOW TO'.
> >
> > Can Adam's explanation be incorporated into the LUG home page
> > somewhere? It certainly deserves to be accessible; if Adam agrees?
>
> Blush, sure I have no problem with that at all. I have since thought of
> one or 2 additions I should have made though.
>
> 1) If your ISP allows and many don't, you should set up a reverse DNS
> record (you need to do this with your ISP, not ZoneEdit or whomever you
> did your other DNS stuff with, since they own the IP address and
> therefore
> answer the DNS lookups on it.
>
> Reverse DNS records are called PTR records and map your IP address back
> to
> a hostname rather than the other way round which you have
> (theoretically)
> already set up. You need to do this if you plan to host mail since some
> mail servers check your forward (hostname to IP address) and reverse DNS
> records (IP address to hostname) and reject your mail if they don't
> match.
> So, set up a PTR record with your ISP that matches the A record you
> provided for the server named in your MX record, aka
> mail.silverrook.co.uk.
excellent explanation has helped me a lot although you were right a
lot of
ISP dont let you do this and mine is one of them :( oh well back to the
drawing board lol
That doesn't mean that you should give up on hosting mail from home, it's
not ideal as some people won't accept mail from you, but it doesn't mean
that it won't work without setting your reverse DNS.
I should also mention that some ISPs add their consumer cable and DSL
ranges to RBLs (Real-time Black Lists) as most spam comes from compromised
machines these days. I remember that people hosted on 1and1 wouldn't
accept mail from me when I hosted from home.
Add this to the article too :)
Regards,
Adam Sweet
--
http://blog.adamsweet.org/