DNAT in freebsd

[Sami Halabi]

Hi,
I did ping 10.0.1.1 from 10.0.1.2, so packet is 10.0.1.2 ->10.0.1.1
> ipfw add 1000 nat 1 all from 10.0.1.2 to 10.0.1.1
if I have 10.0.1.1 in em1 no translation is done!
if I delete it (and add a static arp entry in 10.0.1.2 for mac of 10.0.1.1)
rule 1000 translates well and I get packet from 11.0.3.1->10.0.1.1

> ipfw add 2000 nat 2 all from 11.0.3.1 to 10.0.1.1
no translation is done at all!

Sami

> ipfw add 3000 nat 2 all from 11.0.4.2 to 11.0.3.1
> ipfw add 4000 nat 1 all from 10.0.1.1 to 11.0.3.1
>
>
> ipfw nat 1 config same_ports ureg_only ip 11.0.3.1
> ipfw nat 1 config reverse same_ports ureg_only ip 11.0.4.2



On Mon, Jul 1, 2013 at 1:42 PM, Eugene Grosbein <eugen at grosbein.net> wrote:

> On 01.07.2013 17:05, Sami Halabi wrote:
> > Hi,
> > forgot to mention that but this sysctl is already set to 0.
> > i see in the logs packets pass 1000 rule.
>
> Use rules like 'ipfw add 1500 count log ip from any to any' to check
> intermediate results of translation.
>
>


-- 
Sami Halabi
Information Systems Engineer
NMS Projects Expert
FreeBSD SysAdmin Expert