Manually setting MTUs

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If I look at /etc/sysconfig/network-scripts/ifcfg-bnep0 the MTU is 1691. This is the minimum specified by http://www.bluetooth.com/Bluetooth/Technology/Works/BNEP.htm:

[root@LTSecond ~]# cat /etc/sysconfig/network-scripts/ifcfg-bnep0
# Broadcom BCM92035DGROM USB Bluetooth Adapter - Bluetooth: BNEP (Ethernet Emulation) ver 1.2
DEVICE=bnep0
HWADDR=00:0E:A1:33:A1:22
ONBOOT=no
BOOTPROTO=dhcp
IPV6INIT=no
NM_CONTROLLED=yes
DNS3=192.168.0.1
DNS2=69.94.123.190
DNS1=69.94.123.189
USERCTL=no
PEERDNS=no
MTU=1691
[root@LTSecond ~]#

However, ifconfig shows 1500:

[root@LTSecond ~]# ofcpnfig bnep0
-bash: ofcpnfig: command not found
[root@LTSecond ~]# ifcpnfig bnep0
-bash: ifcpnfig: command not found
[root@LTSecond ~]# ifconfig bnep0
bnep0 Link encap:Ethernet HWaddr 00:0E:A1:33:A1:22 inet addr:192.168.0.17 Bcast:192.168.0.255 Mask:255.255.255.0
         inet6 addr: fe80::20e:a1ff:fe33:a122/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:25756 errors:0 dropped:0 overruns:0 frame:0
         TX packets:17745 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:36149865 (34.4 MiB)  TX bytes:1212843 (1.1 MiB)

[root@LTSecond ~]#

Anybody have any ideas why this won't manually set?

Thanks for any help,

--
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