[ntp:questions] Re: Servers losing sync or not syncing at all.

Danny Mayer mayer at ntp.isc.org
Tue Jan 3 02:44:20 UTC 2006


Terje Mathisen wrote:
> Danny Mayer wrote:
> 
>>TCPdump shows a lot of UDP checksum errors. I'd check your hardware.
> 
> 
> This might not be relevant:
> 
> I have seen any number of TCP/UDP checksum errors over the last year,
> and so far, _all_ of them have been on outgoing packets, i.e. they have
> been logged on a system with a TOE (TCP Offload Engine) where the actual
> checksum is calculated on the network card, after ethereal/snoop/tcpdump
> have logged it.
> 
> Terje
> 

Interesting. Every time I've run into one of these (and I use ethereal)
the bad-checksum indicated a real problem. I've never heard of TCPDump
giving erroneous checksum errors.

Danny



More information about the questions mailing list