tech-net archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: ipfilter, return-icmp and RFC1122

On Thu, Jun 05, 2008 at 11:08:42AM -0400, Jim Wise wrote:
> Hash: SHA1
> On Wed, 4 Jun 2008, Petar Bogdanovic wrote:
> >     +block return-rst  in proto tcp
> >     +block return-icmp in proto udp
> Note that a quick fix would be to treat the broadcast address `specially'
> for these rules.  So replace the above with:
>     my_addr="";
>     broadcast_addr="";
>     block from any to $broadcast_addr
>     block return-rst  in proto tcp
>     block return-icmp(port-unr) in proto udp from any to $my_addr
>     block return-icmp in proto udp
> This should give the most `realistic' error responses for your non-open
> ports, unless I'm missing something (entirely possible).

I tried to avoid using host-dependent addresses in my filter rules,
since this copy of ipf.conf gets distributed among multiple hosts.

But maybe I should leave this path. Thanks for the hint.


Home | Main Index | Thread Index | Old Index