[vpn-help] No connect when configured for jumbo frames

Thomas Stokkeland thomas.stokkeland at mobileheartbeat.com
Fri Oct 25 07:09:40 CDT 2013


I dont know anything about Jumbo's in the context of IPSec - but in 
general, Jumbo's is only for SAN traffic, a packet larger than 1500 is 
generally not routable - so it makes sense to me that a large MTU will 
break any type of connectivity on layer 3 outside the local subnet and 
collision domain.


On 10/25/2013 2:56 AM, Paul Theodoropoulos wrote:
> Just discovered purely by accident that if I configure my ethernet 
> adapter to use 9k jumbo frames (same as my gb ethernet switch 
> supports), Shrew will 'reliably' fail to establish any part of a 
> connection. Reconfiguring the adapter to jumbo frames disabled 
> restores ability to connect.
>
> Odd. Thoughts?
>



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