On 11/09/2015 12:36 PM, Gordon Messmer wrote: > On 11/09/2015 08:34 AM, Steve Clark wrote: >> Has anyone using CentOS 6 been able to successfully set an mtu larger >> than 9710 >> on an interface. > Maximum frame size varies from implementation to implementation: > http://pages.uoregon.edu/joe/jumbo-clean-gear.html > > It's also worth noting that that due to offloading features in modern > NICs, there's often very little benefit to large frames. Since you > *really* need all of the devices on any network segment to use the same > MTU, the best option might be to eliminate jumbo frames (and test the > impact of doing so in terms of throughput and CPU utilization). > Hi Gordon, Thanks for the response. The real issue relates to doing pcap on an interface that is hooked to a span port. The super jumbo frames cause rx_long_length_errors: 2701813 which show up in our monitoring software and the customer thinks there are error on his network. So I wanted to increase the mtu on the interface so these errors would not be reported. -- Stephen Clark *NetWolves Managed Services, LLC.* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark at netwolves.com http://www.netwolves.com