Date: Sat, 11 Jul 1998 10:20:22 +0100 From: Rob <robert@irrelevant.com> To: George <freebsd@mutsgo.kf7nn.com> Cc: questions@FreeBSD.ORG Subject: internal mail servers; was: RE: natd Message-ID: <3.0.3.32.19980711102022.01513100@localhost> In-Reply-To: <199807110319.WAA07070@mutsgo.kf7nn.com>
next in thread | previous in thread | raw e-mail | index | archive | help
At 22:19 10/07/98 -0500, George wrote: >ok that pretty much sums it up, crap... >i was trying to get away with having to pay $3 a month for >an extra IP address. > >I think we could use something like this. > >something that knows what machine is at what internal ip >address and to direct traffic to each machine accordingly. > >maybe just a config file that lists the machine names and >internal ip's and a program that answers requests from >the net for these machines. > >what i am gatering is if there is no DNS lookup for the name then >it will not be sent to the next higher domain for dns. > >like this: > >if someone does a mail to foo.freebsd.org the internic >dont have a name for foo.freebsd.org so it just tells them >that,, it doesnt send them to freebsd.org to find out >who foo is right? > > Ah now.. Mail I've had working.. When incoming connections arrive, there is no way you know what host name was used to get the IP address, (unless you're using HTTP and ask the client) but email is slightly different in that the untimate destination is in the data.. You need to run two DNSs basically, a public one that everyone outside on the internet sees, and a local one, that only your local subnet see. You're probably doing this already, but if not, it's easily accomplished by using your ISP or someone like granitecanyon for the external nameservers, and your own box for the internal one. The external DNS has A entries for all your machines all pointing at your single external IP address, and/or an MX for *.your.domain to that one address. The internal DNS has proper entries for each of your local machines, on their local addresses. Your gateway machine has to run a mailserver, and NOT be given authority for the other machine; just itself. Thus, anyone sending mail to xx@somewhere.my.domain will have it delivered to your gateway machine because that's what the external DNS records say to do with it. It won't want it, will look up where to send it using the internal records, and give it to your internal machine. Simple.. and I managed to do it accidentally, when I first set my network up.. Rob. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3.0.3.32.19980711102022.01513100>