Date: Wed, 19 May 2010 12:21:58 -0700 From: Chuck Swiger <cswiger@mac.com> To: Marco Beishuizen <mbeis@xs4all.nl> Cc: freebsd-questions@freebsd.org Subject: Re: downloading e-mail is blocking network Message-ID: <F624D697-FB70-45BC-AAE3-250C10B927E9@mac.com> In-Reply-To: <alpine.BSF.2.00.1005192101570.5174@yokozuna.lan> References: <alpine.BSF.2.00.1005192101570.5174@yokozuna.lan>
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Hi, Marco-- On May 19, 2010, at 12:15 PM, Marco Beishuizen wrote: > I'm having a strange network problem. Every day, when I turn on my computer, fetchmail is started and procmail is putting all my mail in the correct mailboxes. This takes some time because I receive a few hundred e-mails a day (mostly mailing lists). > > The strange thing is that when the e-mail is being downloaded, all other network traffic seems blocked. So browsing the internet is not possible when fetchmail/procmail is busy. At first I thought I had a problem with DNS and/or DHCP and/or my ADSL modem because after a reset of the modem, the problem mostly went away, and there were some "hostname not found" errors in my logfiles. But today I just waited for a while and discovered that when fetchmail/procmail is finished, the internet suddenly was reachable again. > > So has anyone has seen fetchmail/procmail blocking network traffic before? Are you using NAT? It sounds like something has a limited number of NAT state slots available, and is dropping connections past that limit. It probably will help to try to serialize the activity of fetchmail / procmail so that they aren't opening new connections for every email being processed, if that is what is going on. Regards, -- -Chuck
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