Date: Tue, 21 Feb 2006 05:31:56 -0500 From: Jeremy Kister <freebsd-01@jeremykister.com> To: freebsd-questions@freebsd.org Subject: Re: traffic analysis Message-ID: <43FAEC1C.7060103@jeremykister.com> In-Reply-To: <43FAE72D.4000208@chamonix.reportlab.co.uk> References: <43FAE72D.4000208@chamonix.reportlab.co.uk>
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On 2/21/2006 5:10 AM, Robin Becker wrote: > Our freeBSD 6.0 host is not yet in production, but appears to have outgoing > traffic of around 140Mb/day; the http logs say 16 hits etc. The host provider > said this 140Mb/day is really not that much. Unless my math is wrong because it's past bed time: 140Mb/day divided by 86400 seconds per day = 0.001 Mb/second (average) 0.001 Mb/second = 1.659 Kb/second this means a dialup modem could handle your average traffic. and remember Mb is Megabits, not MegaBytes. > "The server is on a /20-network, and this leads to high amounts of > background traffic (ARP, broadcast, etc.). These traffic types are > likely to be the reason for most of your outbound traffic." Is your server's netmask 255.255.240.0 ??? If it is, call your provider, laugh at them, and then call a new provider. If your netmask is not 255.255.240.0, call the person who gave you that line, laugh at them, and try to find someone more intelligent :) You're surely not on a subnet with 4000 hosts. > I'm not sure I follow this argument. Does this mean I'm responding to large > number of spurious requests? The provider's analysis of the input volume is > pretty small (0Mb). If you were on a network with 4000 other machines, it could certainly cause problems. But i'd bet that someone is just confused -- i'd bet that their entire network space is a /20, and they have allocated a small part of it for your network. > Is there a tool that can give me some reasonable data on this sort of problem? > Perhaps I need to close down some services etc. I doubt it, but you can try tcpdump. -- Jeremy Kister http://jeremy.kister.net./
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