Date: Thu, 1 Sep 2005 13:52:40 -0500 From: Bryan Albright <bryana@darth-vader.org> To: Chuck Swiger <cswiger@mac.com> Cc: Greg Barniskis <nalists@scls.lib.wi.us>, freebsd-questions@freebsd.org Subject: Re: How can I stop "discard oversize frame" errors? Message-ID: <20050901185240.GA1423@darth-vader.org> In-Reply-To: <4317447C.6030201@mac.com> References: <20050901124405.GA6432@darth-vader.org> <43171963.80502@mac.com> <20050901153458.GA39443@darth-vader.org> <43173FC9.5050707@scls.lib.wi.us> <4317447C.6030201@mac.com>
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On 09/01/05 at 02:12PM, Chuck Swiger wrote: > Greg Barniskis wrote: > [ ... ] > >Isn't this message being generated when the router sends a packet that > >exceeds fxp0's MTU, so... the solution is to tune the router's MTU, > >rather than fxp0? I am admittedly just guessing, but intuitively that > >seems right. > > You want to tune the MTU of whatever is generating the oversize packets, > agreed. The messages in syslog do not reveal the source of the oversize > packets, but "tcpdump -n greater 1520" should. > > -- > -Chuck I appreciate all the help, thanks! Okay, I've tried running the above (tcpdump -ni fxp0 greater 1520) but I get no output. If I drop it down to 1510 (tcpdump -ni fxp0 greater 1510), I get responses from everything sized 1452 (13:47:08.929873 IP 63.231.195.31.110 > <MY.PRIV.IP.CUT>.2984: . 17520:18980(1460) ack 1 win 58400) and up. (63.231.195.31 is the pop server my wife uses to check her mail-- and note the length is at 1460, which I don't believe is enough to generate the discard oversize frame errors) However, I've even with the tcpdump running -- at any of the above size levels, I get the "discard oversize frame" errors with a "len" ranging from 1517 up to 2030. *sigh* Frustrating. Thanks again! Bryan -- Never Play Leap Frog With A Unicorn.
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