masquerade on public eth with "in traffic" on the same eth!

RouterOS General
1

how to masquerade on public eth with incoming traffic on the same public interface?

scheme:

public interface ip connected to internet - 80.22.232.35

private network coming trough public interface from a vpn tunnel - 192.168.2.0/24

I have permited all traffic from 192.168.2.0/24 that goes trough public interface.

but the problem is that I dont know how to masquerade traffic from 192.168.2.0/24 so they have access to internet.

Pls help.

thx.

Public and Private IPs on same interface
2

Hai fren
ya, i have little experince like yours
this my history 18 moths ago, i did remember:
on my RB511 has one ether and one wireless interface, before use it, i had problem cos public and loacl on one interface, and i had idea is Bridge interface solution.
on ether i made bridge and local subnet i put on bridge, and put public address to ether and just put incoming and local network with one physical interface and to switch too :
before i am not believe but, it work fine and incredible. and so sorry my english isn't well
this my diagram and benefit: you will have public and private for supply link to your client together.

|ISP with public address
|
Hub ---- RB511 ))))))) Local subnet wirelessly 
|
|------- Local subnet over wire

my suggestion i did do one physic for public and local address. nice...
but now i am not need it, cause i have centralized aaa one with x86

and how to nat for private, i did like this:

/ip fi nat add chain=scrnat out-interface=ether action=masquerade

regards
Hasbullah.com

3

I dont understand what you are saying. as I read i see that bridging them its not a solution.

scheme:

internet                vpn location with 192.168.2.0/24 (some kind of mpls VPN from our ISP)
    |                             |
    |                             |
    |                             |
public eth ---------------
    |
local eth
    |
    |
    |
my local networks

/ip route print

A S 192.168.2.0/24 r 8?.?2.2?3.?3 public_eth0
A S 0.0.0.0/0 r 8?.?2.2?3.?3 public_eth0
ADo 172.16.1.0/24 r 172.16.100.1 lan
ADo 172.16.2.0/24 r 172.16.100.1 lan
ADo 172.16.3.0/24 r 172.16.100.1 lan
ADo 172.16.4.0/24 r 172.16.100.1 lan
ADo 172.16.5.0/24 r 172.16.100.1 lan
ADo 172.16.6.0/24 r 172.16.100.1 lan
ADo 172.16.7.0/24 r 172.16.100.1 lan
ADo 172.16.8.0/24 r 172.16.100.1 lan
ADo 172.16.9.0/24 r 172.16.100.1 lan


and I have putted masquerade rule for source 192.168.2.0/24:
chain=srcnat src-address=192.168.2.0/24 dst-address-list=!localnetworks action=masquerade


routing between 192.168.2.0/24 and my local networks works great, but when I’m trying to ping an external IP, from 192.168.2.0/24 I get request time out.

PLEASE HELP.

Thank you.

4

so sorry fren
that solution as your subject this post :wink:

regards
Hasbullah.com

5

Isn’t it better to assign the network 192.168.2.0/24 to the LAN interface (local eth)? Where are the VPN tunnel coming from, internet or a leased line? The normal procedure if the VPN tunnel are coming from the internet, is to to not use default gateway on remote network.