Bad Argument `lo'

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Hi All,

i using iptables (version 1.4.14) on a LMDE(Debian like) with kernel 3.5.3. Some days before i watched my logs after several weeks again. :-) And i spotted the error message:

Bad argument `lo'

So i searched at google to get a solution and i got one. Some user told to put the <lo> into ticks, like this

'!lo'

My iptables-rules regarding on this problem were looking so,

...
iptables -A INPUT -i ! lo -s 127.0.0.1 -j DROP
...

and i changed this line to,

...
iptables -A INPUT -i '!lo' -s 127.0.0.1 -j DROP
...

Now i am not sure, if this works correctly. <iptables -L> shows me the device "!lo",

######################################################################
Chain INPUT (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source destination
0 0 LOG all -- !lo any localhost anywhere limit: avg 3/sec burst 5 LOG level warning prefix "Loopback gespooft: "
    0     0 DROP       all  --  !lo    any     localhost anywhere
######################################################################

but i am not sure if this works correctly. Does somebody knows if this trick works correctly?

regards Markus
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