Date: Thu, 14 Jul 2011 09:58:53 -0700 From: Chuck Swiger <cswiger@mac.com> To: monarci <josh@monarci.com> Cc: freebsd-questions@freebsd.org Subject: Re: Recurring ICMP Bad Checksum Warning Message-ID: <7FEDA015-A789-469B-8D73-0115D1F323A9@mac.com> In-Reply-To: <1310645898251-4586448.post@n5.nabble.com> References: <1310645898251-4586448.post@n5.nabble.com>
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On Jul 14, 2011, at 5:18 AM, monarci wrote: > I am currently running a company's FreeBSD web server and I am constantly > receiving the ICMP Bad Checksum warning. You most likely have a NIC with hardware checksum capabilities; tcpdump sees outgoing packets before the hardware generates the checksums. You can double-check by sniffing the traffic from a laptop connected to a monitoring port of the switch, or put a hub in place for testing so that the laptop also receives the traffic. Regards, -- -Chuck
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