MikroTik Multiple ISP External Access

RouterOS Forwarding Protocols
1

Howzit guys!!

I hope this is the correct place to post. I have my MikroTik installed with two different ISP’s. The first configuration is as follow:

  1. A billion router (ISP router) authenticating the connection with the ISP with 1-to-1 NAT configured towards the Eth1 interface. I also have 5 Public IP’s (static) setup on the MikroTik for external access. All traffic from my local network (Eth3) is by default routed through the first ISP.

  2. The second configuration is a PPPoE dialup setup on Eth4 towards a different ISP (backup). I also have one Public IP (static) but I can not setup this IP to be accessible externally.

I tried to create a static route through the second ISP gateway, but no luck. What exactly do I need to do to have remote access through both ISP connections?

2

OK, so this is what I’ve done so far…
I followed the wiki http://wiki.mikrotik.com/wiki/Manual:PCC
I did not add any addresses because it was added a few months ago. The bridge was also configured. However, the addresses are as follow:
address=10.0.0.1/24 network 10.0.0.0 interface=bridge1 (local network)
address=xx.xx.38.146/29 network=xx.xx.38.144 interface=ether1
address=xx.xx.64.20 network=xx.xx.64.1 interface=ether5 (this address was added the moment I configured the PPPoE account)

This is my config from where I’ve started:

/ ip firewall mangle
add chain=prerouting dst-address=xx.xx.38.144/29 action=accept in-interface=“bridge1”
add chain=prerouting dst-address=xx.xx.64.1 action=accept in-interface=“bridge1”
add chain=prerouting in-interface=“ether1” connection-mark=no-mark action=mark-connection
new-connection-mark=ISP1_conn
add chain=prerouting in-interface=“Eth5 PPPoE” connection-mark=no-mark action=mark-connection
new-connection-mark=ISP2_conn
add chain=prerouting in-interface=“bridge1” connection-mark=no-mark dst-address-type=!local
per-connection-classifier=both-addresses:2/0 action=mark-connection new-connection-mark=ISP1_conn
add chain=prerouting in-interface=“bridge1” connection-mark=no-mark dst-address-type=!local
per-connection-classifier=both-addresses:2/1 action=mark-connection new-connection-mark=ISP2_conn
add chain=prerouting connection-mark=ISP1_conn in-interface=“bridge1” action=mark-routing
new-routing-mark=to_ISP1
add chain=prerouting connection-mark=ISP2_conn in-interface=“bridge1” action=mark-routing
new-routing-mark=to_ISP2
add chain=output connection-mark=ISP1_conn action=mark-routing new-routing-mark=to_ISP1
add chain=output connection-mark=ISP2_conn action=mark-routing new-routing-mark=to_ISP2

/ ip route
add dst-address=0.0.0.0/0 gateway=xx.xx.38.145 routing-mark=to_ISP1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=“Eth5 PPPoE” routing-mark=to_ISP2 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=xx.xx.38.145 distance=1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=“Eth5 PPPoE” distance=2 check-gateway=ping

/ ip firewall nat
add chain=srcnat out-interface=“bridge1” action=masquerade
add chain=srcnat out-interface=“Eth5 PPPoE” action=masquerade

I could alway access my internal network reomtely through the ISP1 config, however the moment I add the IP routes, both the ISP1 gateways become unreachable. I can access my local network remotely through the ISP2 connection with out any problem. Is it because the ISP1 gateway is unreachable? How can I fix this so that I can access my local network through both ISP’s?

Thanx in advance!!

3

add two default routes, but chek gateway - arp. Then the backup will take over, if you have no arp request from the first one.

4

You need to setup mangle and proper routing tables.

Watch the presentation in my sig, it explains it all.

5

@samsung172. Thanks for the response. Should I check the one gateway with Ping and the other with ARP, or should I only check the secondary gateway with ARP?

@tomaskir. The video in your signature does not work.

6

@tomaskir. The video in your signature does not work.

Sure it does, just open it in chrome or FF. Tiktube doesnt work in IE for me either.