bad udp cksum 26ff!

2005-11-28 Thread John Palmer
I am running FreeBSD 5.4 p8. I did a tcpdump -vv -i em0. The output produced a bad udp cksum with my DNS server. Does anyone know what it means? Or, how I can correct the problem? Thanks JP _ FREE pop-up blocking with the

Re: bad udp cksum 26ff!

2005-11-28 Thread Charles Swiger
On Nov 28, 2005, at 1:46 PM, John Palmer wrote: I am running FreeBSD 5.4 p8. I did a tcpdump -vv -i em0. The output produced a bad udp cksum with my DNS server. Does anyone know what it means? Or, how I can correct the problem? If you are sniffing traffic from the machine itself,

Re: bad udp cksum 26ff!

2005-11-28 Thread Ruslan Ermilov
On Mon, Nov 28, 2005 at 10:46:38AM -0800, John Palmer wrote: I am running FreeBSD 5.4 p8. I did a tcpdump -vv -i em0. The output produced a bad udp cksum with my DNS server. Does anyone know what it means? Or, how I can correct the problem? Turn off hardware checksums on em0, to make

Re: bad udp cksum 26ff!

2005-11-28 Thread Kris Kennaway
On Mon, Nov 28, 2005 at 10:46:38AM -0800, John Palmer wrote: I am running FreeBSD 5.4 p8. I did a tcpdump -vv -i em0. The output produced a bad udp cksum with my DNS server. Does anyone know what it means? Or, how I can correct the problem? If your NIC is doing checksum offload,