Difference between revisions of "MTU/MSS - How to test using PING"
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MTU = max transmission unit of a Layer 2 Frame<br /> | MTU = max transmission unit of a Layer 2 Frame<br /> | ||
MSS = max segment size of a Layer 4 protocol<br /> | MSS = max segment size of a Layer 4 protocol<br /> | ||
Revision as of 05:21, 7 March 2012
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MTU = max transmission unit of a Layer 2 Frame
MSS = max segment size of a Layer 4 protocol
For TCP/IP:
MSS = MTU-40 (TCP and IP headers are 40 bytes)
Testing MTU using Winodws ping command
ping -f -l X hostname (set do not fragment and set icmp payload to X)
Simple loop for Windows ping testing
FOR /L %A IN (1200,1,1473) DO ping -f -n 3 -l %A hostname >> C:\mtu-test.txt
If X = 1388 gets a reponse then
MTU = X + 28 (20 for IP header and 8 for the ICMP header)
MTU = 1416
MSS = 1416 - 40 = 1376