Date: Sat, 13 Jun 1998 18:31:38 +0200 (CEST) From: malte@webmore.com To: Stephen Mathezer <mathezer@harbor.ab.ca> Cc: questions@FreeBSD.ORG Subject: RE: sendmail/dns/relaying question Message-ID: <XFMail.980613183138.malte@webmore.com> In-Reply-To: <Pine.SOL.3.96.980613085906.21002A-100000@gemini>
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Make an alias 123.123.123.124 for 123.123.123.123 Enter 123.123.123.124 to point on fw.domain2.com in the rev-zone-file Malte. On 13-Jun-98 Stephen Mathezer wrote: > > You're probably right, a RAR on 123.123.123.123 gives fw.domain1.com. > Which should be OK because that is what the machine thinks that it is. > > The problem I think is that when sending email to user@domain2.com, the MX > lookup for domain2.com will return fw.domain2.com as an MX but the > firewall doesn't know that it is also in domain2 since I don't know of any > way to make a machine know it is part of two domains. So the firewall > thinks something like: I am called fw.domain1.com the MXs for > domain2.com are fw.domain2.com and real_mail_server.domain2.com, I am not > an MX for domain2.com therefore I cannot relay..... > > -Steve > > On Sat, 13 Jun 1998 malte@webmore.com wrote: > >> Everything looks fine with your config, BUT the big question is: >> What does a RAR on 123.123.123.123 give ? >> >> It seems here is your problem. >> >> Malte. >> >> On 12-Jun-98 Stephen Mathezer wrote: >> > >> > This isn't really FreeBSD specific but I'm hoping someone out there can >> > help me with this. >> > >> > Suppose I have two domain names which cover the same set of IP addresses. >> > >> > eg: fw.domain1.com = 123.123.123.123 >> > fw.domain2.com = 123.123.123.123 >> > >> > Now, I have a firewall which is relaying mail from the Internet to an >> > internal mail server. >> > >> > I am trying to use the relay_based_on_MX feature in Sendmail 8.9.0 >> > Neither domain1.com nor domain2.com is in sendmail.cw since I want to >> > relay mail for these domains to an internal mail server. >> > >> > The internal DNS used by the firewall lists fw as the mail exchanger for >> > the domain so things sort of work. >> > >> > Here is my problem >> > >> > I want to use the short form of the DNS tables. >> > >> > eg: >> > db.both-domain looks like: >> > >> > @ IN SOA fw.domain1.com. me.domain1.com. ( >> > .........) >> > >> > @ IN A 123.123.123.124 >> > MX 10 real-mail-server >> > MX 20 fw >> > >> > named.boot then looks like >> > >> > primary domain1.com db.both_domains >> > primary domain2.com db.both_domains >> > >> > >> > All machines have the same addresses in both domains the two domain stuff >> > is simply so that our marketing folks can be happy with our fancy domain >> > name and the rest of us can use the one we have always used. >> > I really would rather not maintain two db files separately for the domains >> > which is why I am using the short form and only using one file. >> > >> > The problem arrives when I try to send mail to user@domain2.com from the >> > Internet. The relay_based_on_MX doesn't allow the relay because the >> > firewall (which to the outside world is our primary MX) decides that it is >> > not an MX for domain2.com since it knows that it's name is fw.domain1.com. >> > >> > So, is there a way that I can make my firewall realize that it is in both >> > domains or is there a simpler way of going about this. The goal I am >> > trying to acheive here is: >> > >> > 1- fw is the primary MX for domain1.com and domain2.com as far as the >> > outside world is concerned. >> > 2- fw does NOT deliver mail locally for either but rather forwards it to >> > real_mail_server.domain1.com (acheived by using a different name server >> > internally which lists a different set of MXs which do include fw) >> > 3- I only need to maintain _1_ db file for both domains under DNS >> > 4- I am a good neighbour and limit the spam I allow to pass through my >> > system. >> > >> > Thanks for reading my long winded query I would appreciate any advice. >> > >> > -Steve >> > >> > >> > To Unsubscribe: send mail to majordomo@FreeBSD.org >> > with "unsubscribe freebsd-questions" in the body of the message >> >> ---------------------------------- >> E-Mail: malte@webmore.com >> Date: 13-Jun-98 >> Time: 12:24:56 >> ---------------------------------- >> > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message ---------------------------------- E-Mail: malte@webmore.com Date: 13-Jun-98 Time: 18:13:00 ---------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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