Bridging of two ISP lines from Mikrotik to router behind

RouterOS Beginner Basics
1

Hi all,

I have the following question regarding bridging of two Internet connections (cable and ADSL) to router which would be behind my Mirkotik RB 450.

This is how things stand:

  1. On one Ethernet port we have Internet connection which is primary (static IP address) and which should be bridged directly to router which is behind Mirkotik RB 450 (this router is CISCO PIX also fw).

  2. On other Ethernet port we have ADSL line which is backup (also static IP address) and which should be also bridged to CISCO PIX, but only if primary line fails.

  3. On third port is connected CISCO PIX itself and behind it is production LAN

So, we have primary line (cable) which is working and it is bridged to CISCO PIX WAN adapter. If primary line fails, then the adsl becomes bridged to CISCO PIX WAN adapter until primary line is re- established.

Please advise, which is the best method of doing so my pix behind is always available?

Best regards,
Vladimir

2

Since this is mikrotik, there is a few ways to accomplish this. :slight_smile: First of i read bridge, but think, probably routed. If this is the case you would set two default gateways in your mikrotik. The primary route with distance set lower than secondary and also check gateway enabled on both. If primary goes down, secondary will instantly become default route. Also possible to make use of netwatch located under tools, does exactly as the name suggest. With this it is possible to switch any thing, even a bridge. :sunglasses: