packets skipping DNAT rules

I have some rules in the PREROUTING of the nat table that
perform a DNAT 
however, on a very consistent basis the rules doesn't get
applied and 
the packet ends up in the filter table without the
destination modified. 
95% of the time it works, 5% it doesn't. I can't put a
finger on whats 
causing it, or see anything in particular about the packets
that fail to 
DNAT. Any suggestions on how to resolve this?

--
Ritter

Mr Ritter zei:
> I have some rules in the PREROUTING of the nat table
that perform a DNAT
>  however, on a very consistent basis the rules doesn't
get applied and
> the packet ends up in the filter table without the
destination modified.
>  95% of the time it works, 5% it doesn't. I can't put
a finger on whats
> causing it, or see anything in particular about the
packets that fail to
>  DNAT. Any suggestions on how to resolve this?

You can start by posting your ruleset, please show us the
output from
iptables-save. Also, you failed to mention if those packets
that don't get
DNATted are really random or creating a new connection.

HTH,
M4