[j-nsp] Destination NAT

[Mohammad Khalil]

Sorry but it did not work again
set security zones security-zone trust address-book address ALTOS_SERVER
132.147.160.3/32

set applications application TELNET_DNAT protocol tcp
set applications application TELNET_DNAT destination-port 3333

set security nat destination pool DNAT_POOL address 132.147.160.3/32
set security nat destination pool DNAT_POOL address port 23

set security nat destination rule-set DNAT_RULE from zone untrust

set security nat destination rule-set DNAT_RULE rule rule1 match
destination-address 24.173.164.162/32
set security nat destination rule-set DNAT_RULE rule rule1 match
destination-port 3333
set security nat destination rule-set DNAT_RULE rule rule1 then
destination-nat pool DNAT_POOL

set security policies from-zone untrust to-zone trust policy
DNAT_ALTOS_POLICY match source-address any
set security policies from-zone untrust to-zone trust policy
DNAT_ALTOS_POLICY match destination-address ALTOS_SERVER
set security policies from-zone untrust to-zone trust policy
DNAT_ALTOS_POLICY match application TELNET_DNAT
set security policies from-zone untrust to-zone trust policy
DNAT_ALTOS_POLICY then permit


On Thu, Nov 28, 2013 at 11:56 AM, Per Westerlund <p1 at westerlund.se> wrote:

> I am sorry to say that I think it is almost correct. The policy rules are
> evaluated after destination NAT handling, where the destination port has
> already been translated. You should probably exchange:
>
> set security policies from-zone untrust to-zone trust policy
> DNAT_POLICY match application TELNET_DNAT
>
>
> for:
>
> set security policies from-zone untrust to-zone trust policy
> DNAT_POLICY match application junos-telnet
>
> /Per
>
>
> 28 nov 2013 kl. 09:48 skrev Asad Raza <asadgardezi at gmail.com>:
>
> Actually your NAT pool config need changes as well. Following is the
> correct config with changes highlighted:
>
> Assumption:
>
> Real (private) IP of server: x.x.x.x:23
> Public (NAT) IP of server : y.y.y.y:3333
>
> set security zones security-zone trust address-book address SERVER
> x.x.x.x/32
>
> set applications application TELNET_DNAT protocol tcp
> set applications application TELNET_DNAT destination-port 3333
>
> set security nat destination pool DNAT_POOL address x.x.x.x/32
> set security nat destination pool DNAT_POOL address port 23
>
> set security nat destination rule-set DNAT_RULE from zone untrust
>
> set security nat destination rule-set DNAT_RULE rule rule1 match
> destination-address y.y.y.y/32
> set security nat destination rule-set DNAT_RULE rule rule1 match
> destination-port 3333
> set security nat destination rule-set DNAT_RULE rule rule1 then
> destination-nat pool DNAT_POOL
>
> set security policies from-zone untrust to-zone trust policy DNAT_POLICY
> match source-address any
> set security policies from-zone untrust to-zone trust policy DNAT_POLICY
> match destination-address SERVER
> set security policies from-zone untrust to-zone trust policy DNAT_POLICY
> match application TELNET_DNAT
> set security policies from-zone untrust to-zone trust policy DNAT_POLICY
> then permit
>
> Hope it works now :)
>
> Regards,
>
> Asad
>
>
>