Difference between revisions of "Jumbo Frame Support Info"
(Created page with "Category:Wireshark If you enable Jumbo Frames within a Layer 2 switching infrastructure, the following table shows what will happen depending on a hosts NIC settings: Host A...") |
|||
| Line 7: | Line 7: | ||
Host A: Jumbo Frames Enabled, Host B: Jumbo Frames Disabled | Host A: Jumbo Frames Enabled, Host B: Jumbo Frames Disabled | ||
| − | =>TCP will | + | =>TCP will communication will use non Jumbo (1514 byte) frames. |
During the TCP 3-way handshake hosts indicate to each other in the initial SYN and SYN-ACK (using the TCP Options Maximum Segment Size (MSS) field) what size segments they can support. A sender will use the lower of the received MSS and the MSS of its outgoing NIC. | During the TCP 3-way handshake hosts indicate to each other in the initial SYN and SYN-ACK (using the TCP Options Maximum Segment Size (MSS) field) what size segments they can support. A sender will use the lower of the received MSS and the MSS of its outgoing NIC. | ||
=>UDP communication could fail from Host A to B as A could send too large a frame that B can not support. | =>UDP communication could fail from Host A to B as A could send too large a frame that B can not support. | ||
A wireshark trace on Host B would not even show the traffic as the NIC would discard it. | A wireshark trace on Host B would not even show the traffic as the NIC would discard it. | ||
Revision as of 06:23, 27 July 2011
If you enable Jumbo Frames within a Layer 2 switching infrastructure, the following table shows what will happen depending on a hosts NIC settings:
Host A & Host B: Jumbo Frames Enabled: =>TCP and UDP will communicate using Jumbo frames.
Host A: Jumbo Frames Enabled, Host B: Jumbo Frames Disabled
=>TCP will communication will use non Jumbo (1514 byte) frames. During the TCP 3-way handshake hosts indicate to each other in the initial SYN and SYN-ACK (using the TCP Options Maximum Segment Size (MSS) field) what size segments they can support. A sender will use the lower of the received MSS and the MSS of its outgoing NIC.
=>UDP communication could fail from Host A to B as A could send too large a frame that B can not support. A wireshark trace on Host B would not even show the traffic as the NIC would discard it.