From owner-freebsd-net Mon Oct 15 8:45:58 2001 Delivered-To: freebsd-net@freebsd.org Received: from cessium.prosolve.com (gw.prosolve.com [63.225.188.140]) by hub.freebsd.org (Postfix) with ESMTP id 3D56F37B408 for ; Mon, 15 Oct 2001 08:45:44 -0700 (PDT) Received: from fs01.prosolve.com (fs01.prosolve.com [172.16.128.50]) by cessium.prosolve.com (8.11.4/8.11.4) with ESMTP id f9FEp5S15364; Mon, 15 Oct 2001 07:51:06 -0700 (PDT) Received: by fs01.prosolve.com with Internet Mail Service (5.5.2653.19) id <4XX5B5MT>; Mon, 15 Oct 2001 07:51:04 -0700 Message-ID: From: Sean Mathias To: "'Drew J. Weaver'" Cc: "'freebsd-net@FreeBSD.ORG'" Subject: RE: DNS causing problems with sendmail? Date: Mon, 15 Oct 2001 07:51:01 -0700 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C15588.CE86D2A0" 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_01C15588.CE86D2A0 Content-Type: text/plain; charset="iso-8859-1" I have seen a similar timeout problem, though not with dial up. The problem was with the ident protocol talking to other mail servers. When I turned off this check, performance improved greatly. In the sendmail.cf file, I changed the ident timeout to zero to disable it. O Timeout.ident=0s Hope this helps, Sean Mathias Network & Security Consultant Prosolve http://www.prosolve.com v. (206) 306-2525 f. (206) 306-2526 -----Original Message----- From: Drew J. Weaver [mailto:drew.weaver@thenap.com] Sent: Monday, October 15, 2001 5:41 AM To: 'freebsd-net@freebsd.org' Subject: DNS causing problems with sendmail? 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_01C15588.CE86D2A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I have=20 seen a similar timeout problem, though not with dial up.  The = problem was=20 with the ident protocol talking to other mail servers.  When I = turned off=20 this check, performance improved greatly. 
 
In the=20 sendmail.cf file, I changed the ident timeout to zero to disable=20 it.
 
O=20 Timeout.ident=3D0s
 
Hope=20 this helps,
 

Sean Mathias
Network & Security Consultant
Prosolve
http://www.prosolve.com =
v. (206) 306-2525
f. (206)=20 306-2526

-----Original Message-----
From: Drew J. Weaver=20 [mailto:drew.weaver@thenap.com]
Sent: Monday, October 15, = 2001 5:41=20 AM
To: 'freebsd-net@freebsd.org'
Subject: DNS = causing=20 problems with sendmail?

Hi, I've had this = problem for a=20 few days now, we have a small dial-up ISP and when users dial into = one of our=20 cities they get a 209.xxx.xxx.xxx IP and our mail server responds = normally, we=20 have another modem pool in that city that consists of 206.xxx.xxx.xxx = IP=20 addresses, if a user gets a 206.xxx.xxx.xxx IP address and they = attempt to=20 check mail it takes a good 2-3 minutes before the sendmail connection starts, which is an obvious = problem=20 because of the timeouts on email clients (and.. 2-3 minutes is just = bad). I've=20 been kinda asking around on comp.mail.sendmail about this issue and they = are telling=20 me it is a DNS problem. Well, I know that my mail server can reverse = the IP=20 addresses because if I am logged in and issue a host command with the = IP after=20 it the server is able to produce the proper reverse name. Another = user thought=20 it was because I have no Forward dns (a = record) for=20 what the IPs are reversed to, but the = fact is I've=20 NEVER had any A records or anything for my = modem=20 pools. I also have another server running the same version of sendmail, and if I dial into this city and get = a=20 206.xxx.xxx.xxx IP and telnet to port 25 on that server it comes up = instantly.=20 So this appears to be an issue only effecting one daemon on one = server. The=20 afflicted server also runs a POP daemon that isn't having any = problems of this=20 type.

 

Does anyone have a clue = on this?=20 I'm awfully confused at this point.

 

Thanks,

-Drew

 

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