Can anyone comment on this  approach ?   it  will be good  to have this 
feature. 


On Friday, September 16, 2016 at 5:49:06 PM UTC-7, sgas wrote:
>
> Ran  couple of tests to see  what happens when  MTU of overlay interfaces 
> are different. 
>
> 1.  One end at MTU 8950 and  the other at MTU  1450 .  In this case  the 
> veth peer  connecting the  MTU 1450 interface to the  overlay bridge has 
> MTU of 8950.   Ping from the MTU 8950 side. 
>
>     ping -s 8900 <mtu1450h>   -fails
>
>
> 2.  Set the veth peer  MTU to 1450 .  
>     
>    ping -s 8900 <mtu1450h>   -works 
>
>
> I think  "docker exec"  should allow setting the MTU of the overlay 
> interface and  if the peer veth 's MTU is also  made the same ( and 
> provided PMTU  is set  correctly, /proc/sys/net/ipv4/ip_no_pmtu_disc is 
>  not 1 )   everything should work .  
>
>
>
>
>  
>

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