i made some work-around. when card LAN is already up then networkmanager call 
scripts from /etc/network/if-up.d
so, in dir /etc/network/if-up.d add file setmtu1500
in setmtu1500 is:
#!/bin/bash
# set MTU = 1500
ifconfig eth0 mtu 1500

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nvidia ethernet LAN at 20 KB per second
https://bugs.launchpad.net/bugs/92567
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