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Posts: 16
Joined: Tue Feb 26, 2013 12:40 pm

Bridge ADSL Modem/Router to Mikrotik Router

Tue Mar 05, 2013 12:51 pm

Dear Professionals
I'm having problems with making IPsec tunnel between two offices. I asked a question the other day about IP. Now, I've found that I can bridge the ADSL modem to my RB450G in order to get rid of the IP that My Modem gives to the router.

So, I can easily put my Zyxel or Maxnet Modem on Bridge mode. What I don't understand is how to set up the RB450G to be able to dial the PPPoE connection.

This is what I did so far:

1.Created a ppp profile with change TCP MSS= yes
2.Created a PPPoE Client with my username and password from my ISP and assigned the aforementioned profile to it.
3. I went to the IP addresses and deleted the IP that was given to router by the modem.
4. IP Firewall NAT and masqueraded the pppoe interface
At this point I can see my public IP in addresses and I can connect to the internet, however I can no more connect to my modem and I'm afraid that someting is wrong and my security is at exposure.

Here's my detailed options:

PPPoE Client
admin@MikroTik] /interface pppoe-client> print
Flags: X - disabled, R - running 
 0  R name="pppoe-out1" max-mtu=1480 max-mru=1480 mrru=disabled 
      interface=ether1-gateway user="xxxxxxx" password="yyyyyyyyyy" 
      profile=ppp-wan service-name="" ac-name="" add-default-route=yes 
      dial-on-demand=no use-peer-dns=yes allow=pap,chap,mschap1,mschap2
[admin@MikroTik] > ip firewall nat print
Flags: X - disabled, I - invalid, D - dynamic 
 0   ;;; default configuration
     chain=srcnat action=masquerade out-interface=ether1-gateway 

 1   ;;; default configuration
     chain=srcnat action=masquerade out-interface=pppoe-out1

[admin@MikroTik] > ip address print
Flags: X - disabled, I - invalid, D - dynamic 
 #   ADDRESS            NETWORK         INTERFACE                              
 0   ;;; default configuration    ether2-master-local                    
 1 X     ether1-gateway       -------> Disabled this                 
 2 D x.x.x.x/32  x.x.x.x    pppoe-out1
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Re: Bridge ADSL Modem/Router to Mikrotik Router

Wed Mar 06, 2013 12:21 am

Typically when an ADSL modem is placed in bridge mode it retains a private IP number which can still be used to access it. By placing a private number on the same subnet on your WAN Ethernet interface you should be able to contact it. e.g. if it retains you could add and be able to access it.

As regards it being in bridge mode - yes the routerboard is now your only security. See the following on securing the router itself and your internal networks: ... rOs_Router
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