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On 03.02.2015 13:04, Ian Smith wrote:
>> Now to make stateful firewall with NAT you need to make some not
>> very "readable" tricks to record state ("allow") of outbound
>> connection before NAT, but pass packet to NAT after that. I know
>> two:
>>
>> (a) skipto-nat-allow pattern from many HOWOTOs
>
> Lev, can you provide references for these HOWTOs you refer to?
>
> I have a suspicion that some of them should be taken out and shot.
google for "FreeBSD ipfw nat stateful" :) There are lot of them. Not
real HOWTOs, but blog posts & alike.
BTW, without new mechanism it is really hard to do such firewall, as
we need action (nat) after "allow keep-state". It could be done with
this ugly skip-to or with "allow keep-state" in INCOMING section of
firewall, what is not much better, as I prefer to decide let packet
out or not in OUTCOMING part of firewall and with "allow keep-state"
in incoming path it flood state table with unused states.
Another problem, that "keep-state" acts as "check-state" too, so you
could not have ANOTHER "keep-state" before NAT in outgoing part or you
miss nat completely (sate is created in outgoing path, and then
checked before nat in outgoing path with "keep-state", grrrrr, ugly!).
- --
// Lev Serebryakov AKA Black Lion
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