Comment 10 for bug 283048

hey.
i was fighting with that to. so now i have:
in /etc/network/interfaces
[...]
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#auto eth0
#iface eth0 inet dhcp
# MTU 1496

and in /var/lib/dhcp3/dhclient.leases (in windowed NetworkManager i have manually set MTU 1500)
lease {
  interface "eth0";
  fixed-address 192.168.0.11;
  option subnet-mask 255.255.255.128;
  option routers 192.168.0.1;
  option dhcp-lease-time 86400;
  option dhcp-option-overload 3;
  option dhcp-message-type 5;
  option domain-name-servers 192.168.0.1;
  option dhcp-server-identifier 192.168.0.1;
  option interface-mtu 576;
  option broadcast-address 255.255.255.255;
  renew 1 2009/03/09 01:20:12;
  rebind 1 2009/03/09 01:20:12;
  expire 1 2009/03/09 01:20:12;
}
lease {
  interface "eth0";
  fixed-address 192.168.0.11;
  option subnet-mask 255.255.255.128;
  option routers 192.168.0.1;
  option dhcp-lease-time 86400;
  option dhcp-option-overload 3;
  option dhcp-message-type 5;
  option domain-name-servers 192.168.0.1;
  option dhcp-server-identifier 192.168.0.1;
  option interface-mtu 576;
  option broadcast-address 255.255.255.255;
  renew 1 2009/03/09 12:17:13;
  rebind 1 2009/03/09 22:20:17;
  expire 2 2009/03/10 01:20:17;
}