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Re: Bad UDP Checksum on Mac Mini running Linux Gentoo

Subject: Re: Bad UDP Checksum on Mac Mini running Linux Gentoo
Date: Sat, 24 Sep 2005 13:39:05 +0200
On Fri, Sep 23, 2005 at 09:37:05AM -0700, Jon Passki wrote:

While looking into an issue with scanning, I noticed bad udp
checksums (as reported by tcpdump) for SNMP traffic.

Do you run tcpdump on the machine that generates the packets? In this
case, the kernel may be offloading checksum computation to the network
interface and tcpdump sees the packets before the checksum is done.
Check it by running tcpdump on the router or the target...

Martin Mačok
ICT Security Consultant
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