Hi!
Great question:
On Sun, Jul 22, 2012 at 4:04 AM,
kitepilot@kitepilot.com <
kitepilot@kitepilot.com> wrote:
> Hello World:
> I run my firewall on a LFS box.
>
You might also consider a hardened kernel with:
http://grsecurity.net/
> Everything on it is compiled from source.
> No bells and whistles, only the essential software is installed.
> The hardware is 64 bits but I've been running 32 bit OS.
>
32-bit iptables doesn't work on a machine running amd64 kernel, when run
it reports:
===
# iptables -L
iptables v1.2.11: can't initialize iptables table `filter': Module is
wrong version Perhaps iptables or your kernel needs to be upgraded
iptables has to be 64bit to talk to a 64bit kernel due to an alignment
issue in the kernel structures for iptables. So you do need at least
the 64bit iptables binary and associated libs.
This time around I am wondering...
> The question is:
> Is there any advantage to compiling the whole iptables enchilada in 64
> bits?
>
- 32 bit is faster than 64 bit
- 32 bit is well tested, 64 bit isn't tested at all
- 2039 is still long way off
The only reasons to compile anything in 64bit architecture:
- It needs to access more than 4GB of memory. In the real world this
only applies to huge databases.
- It needs to talk to the kernel directly. Some applications, like
iptables, contain ugly hacks to support the 64 bit kernel/32 bit
userland thing.
- It is a kernel.
For you to talk with your 64bit kernel, you need 64bit iptables!
> Should it be avoided?
> Please note that the 'normal' rules like 'more than 4GB and/or
> 32-bit-adobe' do not apply here, what I am looking for is whether
> filtering/marking will be faster/slower and (if known) why.
> Any ideas?
> Tnx
> ET
>
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