sorry but for sure:
ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:11:d8:a2:a2:49  
          inet addr:192.168.0.10  Bcast:192.168.0.127  Mask:255.255.255.128
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:40662 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25541 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:55877425 (55.8 MB)  TX bytes:7549665 (7.5 MB)
          Interrupt:21 Base address:0x2000 
obviously when i change the MTU in NetworkManager to automatic ifconfig eth0 
looks like that
eth0      Link encap:Ethernet  HWaddr 00:11:d8:a2:a2:49  
          inet addr:192.168.0.10  Bcast:192.168.0.127  Mask:255.255.255.128
          UP BROADCAST RUNNING MULTICAST  MTU:576  Metric:1
          RX packets:40662 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25541 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:55877425 (55.8 MB)  TX bytes:7549665 (7.5 MB)

/var/lib/dhcp3/dhclient.leases and /etc/network/interfaces is identical like 
over. 
          Interrupt:21 Base address:0x2000

-- 
NM 0.7 doesn't automatically apply correct MTU setting
https://bugs.launchpad.net/bugs/283048
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