Recurring ICMP Bad Checksum Warning
cswiger at mac.com
Thu Jul 14 16:59:20 UTC 2011
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.
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