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10.3: MTU fixes for Ethernet and Airport connections
I remember setting my MTU to 1492 in my router years ago based on someone's suggestion. Never had a problem after that with PPPoE connections.
10.3: MTU fixes for Ethernet and Airport connections
The normal maximum packet length is 1500. The PPPoE header occupies 6+2 bytes, leaving only 1492.
Here are some links:
http://www.allaboutjake.com/network/linksys/mtu.html
http://www.cisco.com/warp/public/794/router_mtu.html http://www.qnx.com/developer/docs/momentics621_docs/neutrino/technotes/path_mtu.html http://www.mynetwatchman.com/kb/adsl/pppoemtu.htm This last one is interesting - it suggests that a setting of 1454 is better than 1492. Sorry- I can't give you that last link correctly due to some *!@$#$ filter. Instead of *censored* type the following without the dot: t.wat
10.3: MTU fixes for Ethernet and Airport connections
Normally one could test for the max MTU possible, by pinging with large packet sizes and the 'do not fragment' flag set. However this seems to be impossible to do under recent OS X implementations, because the man page, and the usage for ping don't match the executable. For example, the man page says -D is the flag for 'do not fragment', but executable will not accept this flag. |
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