From owner-freebsd-questions@FreeBSD.ORG Thu Sep 11 01:33:40 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6C56B1065678 for ; Thu, 11 Sep 2008 01:33:40 +0000 (UTC) (envelope-from af300wsm@gmail.com) Received: from wf-out-1314.google.com (wf-out-1314.google.com [209.85.200.175]) by mx1.freebsd.org (Postfix) with ESMTP id 053318FC15 for ; Thu, 11 Sep 2008 01:33:39 +0000 (UTC) (envelope-from af300wsm@gmail.com) Received: by wf-out-1314.google.com with SMTP id 24so117062wfg.7 for ; Wed, 10 Sep 2008 18:33:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from :user-agent:mime-version:to:subject:references:in-reply-to :content-type:content-transfer-encoding; bh=xfQE1B6SIgx8/eQKfSGXgvUxFebKaZ0IJvx1MsHrUDo=; b=N0BX063bCf+msqwb5JYTSec4zNCgsyXJ3oiiIw3kahwuCoFVxwc5RQH92jbRFV5S1k J5R42145Q7YOTIE74Wts8xgoqKNE52nMlPjQX2ioCQcC59Z5RvYIxsum7sHJl8mDwVEN vdVvDmBmHEGct3835pF2pNOf9ILuVNV0PNO6U= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; b=bQU1Qv5t7lF1E5unMPlGL5HpgId2SPcAFfLuHnGyY9kxcG8UO/5q+a4kkjINmoyn9B 1BJ4hb5K/q9kS1DjI1DUlgH1rGuHX4vMLycylSVnj6KPGrs4h+OTk9RJJDf9owAcy24d 1Dkdrh+8fMhDz2Qts9CA4uhBmaLi65Ccugwmk= Received: by 10.141.204.20 with SMTP id g20mr1284749rvq.230.1221096819502; Wed, 10 Sep 2008 18:33:39 -0700 (PDT) Received: from ?192.168.0.2? ( [71.221.160.38]) by mx.google.com with ESMTPS id b39sm13393005rvf.0.2008.09.10.18.33.38 (version=TLSv1/SSLv3 cipher=RC4-MD5); Wed, 10 Sep 2008 18:33:38 -0700 (PDT) Message-ID: <48C87517.8020908@gmail.com> Date: Wed, 10 Sep 2008 19:32:07 -0600 From: Andrew Falanga User-Agent: Thunderbird 2.0.0.16 (Windows/20080708) MIME-Version: 1.0 To: "freebsd-questions@freebsd.org" References: <200809061928.28539.af300wsm@gmail.com> <20080907034834.GB37461@shepherd> In-Reply-To: <20080907034834.GB37461@shepherd> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: mail server DNS configuration questions X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Sep 2008 01:33:40 -0000 Sahil Tandon wrote: > Andrew Falanga wrote: > > >> It doesn't take a rocket scientist, or a computer scientist, to >> figure out we've got DNS issues. >> > > What exactly is the problem though? What problems are you having on > the mail server that lead you to the above conclusion? > > Clients in the churches private network cannot send mail using this server, though they can receive mail from it (POP). The church has a private network, PN1, and the mail server sits at a church members house because he has a static IP address; let's call that PN2. The router at his house is setup to forward traffic over port 25, and the POP port, to this server. Also, just to further clarify, the Internet separates these two Private Networks. However, this may not be entirely true as I think about it because at both locations, the ISP is CableOne using cable broadband. So, though technically part of the Internet, the traffic shouldn't leave the CableOne domain. Also, of interest, is that another of our pastors uses CableOne at home and is unable to send e-mail using the churches server from home. However, from a coffee shop in town, that our pastors frequent, they are able to send mail. It is my understanding that this coffee shop does not use CableOne. So, just to make sure everyone's got it, the mail server sits in PN2. While diagnosing this, I connect to the server (using Putty) from a machine in PN1, using either a mail client or telnet I'm unable to make a connection to the mail server over port 25. Using tcpdump during this putty session I do not even see the SYN packets for the start of the connection from the machines in PN1. This is only when connecting to port 25. Obviously, I can connect to the server because I'm using putty. Also, I can see the SYN packets for the start of the connection when this same machine in PN1 attempts to connect to port 80. The problem seems to be when trying to connect over port 25. For some reason, the packets aren't being delivered to that address (72.24.34.252). This happens if I try to telnet to mail.whitneybaptist.org or telnet to 72.24.34.252 on port 25. The packets aren't being delivered. They're being sent somewhere else, or lost in digital purgatory. Now, from home (my home) let's call this PN3, I can send/receive mail using the church e-mail server. I, however, don't use CableOne. Are there routers that route traffic based on port number? It's almost as if traffic, that originates within the CableOne domain and travels through, but not outside, the CableOne domain, doesn't get routed to the correct address when it's destined for port 25. Andy