From owner-freebsd-net Mon Oct 15 5:36:58 2001 Delivered-To: freebsd-net@freebsd.org Received: from mailman.thenap.com (mailman.thenap.com [209.190.0.10]) by hub.freebsd.org (Postfix) with ESMTP id 8BCE237B406 for ; Mon, 15 Oct 2001 05:36:49 -0700 (PDT) Received: by MAILMAN with Internet Mail Service (5.5.2653.19) id <42VNJD5B>; Mon, 15 Oct 2001 08:40:53 -0400 Message-ID: From: "Drew J. Weaver" To: "'freebsd-net@freebsd.org'" Subject: DNS causing problems with sendmail? Date: Mon, 15 Oct 2001 08:40:46 -0400 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C15576.9C5395F0" Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C15576.9C5395F0 Content-Type: text/plain Hi, I've had this problem for a few days now, we have a small dial-up ISP and when users dial into one of our cities they get a 209.xxx.xxx.xxx IP and our mail server responds normally, we have another modem pool in that city that consists of 206.xxx.xxx.xxx IP addresses, if a user gets a 206.xxx.xxx.xxx IP address and they attempt to check mail it takes a good 2-3 minutes before the sendmail connection starts, which is an obvious problem because of the timeouts on email clients (and.. 2-3 minutes is just bad). I've been kinda asking around on comp.mail.sendmail about this issue and they are telling me it is a DNS problem. Well, I know that my mail server can reverse the IP addresses because if I am logged in and issue a host command with the IP after it the server is able to produce the proper reverse name. Another user thought it was because I have no Forward dns (a record) for what the IPs are reversed to, but the fact is I've NEVER had any A records or anything for my modem pools. I also have another server running the same version of sendmail, and if I dial into this city and get a 206.xxx.xxx.xxx IP and telnet to port 25 on that server it comes up instantly. So this appears to be an issue only effecting one daemon on one server. The afflicted server also runs a POP daemon that isn't having any problems of this type. Does anyone have a clue on this? I'm awfully confused at this point. Thanks, -Drew ------_=_NextPart_001_01C15576.9C5395F0 Content-Type: text/html Content-Transfer-Encoding: quoted-printable

Hi, I've had this problem = for a few days now, we have a small dial-up ISP and when users dial into = one of our cities they get a 209.xxx.xxx.xxx IP and our mail server responds = normally, we have another modem pool in that city that consists of 206.xxx.xxx.xxx = IP addresses, if a user gets a 206.xxx.xxx.xxx IP address and they attempt = to check mail it takes a good 2-3 minutes before the sendmail connection starts, which is an obvious problem because of the timeouts = on email clients (and.. 2-3 minutes is just bad). I've been kinda asking around on comp.mail.sendmail about = this issue and they are telling me it is a DNS problem. Well, I know that my mail = server can reverse the IP addresses because if I am logged in and issue a host = command with the IP after it the server is able to produce the proper reverse = name. Another user thought it was because I have no Forward dns (a record) for what the IPs are reversed = to, but the fact is I've NEVER had any A records or = anything for my modem pools. I also have another server running the same version = of sendmail, and if I dial into this city and get a 206.xxx.xxx.xxx IP and telnet to port 25 on that server it comes up = instantly. So this appears to be an issue only effecting one daemon on one server. = The afflicted server also runs a POP daemon that isn't having any problems = of this type.

Does anyone have a clue on = this? I'm awfully confused at this point.

Thanks,

-Drew

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