If you're handing out public IPs to customers then you will need to run BGP to properly failover between multiple upstreams. Most ISPs require you purchase a dedicated circuit before they will run BGP with you.
If all of your customers are behind NAT then you don't need BGP. With NAT failover your customers will just have to restart their HTTP / SIP sessions to re-gain service as the old entries in the connection tracking table mapping to the downed connection will no longer be valid. If you have public IPs (/24's or greater), are not running BGP, but are looking to add a secondary dedicated circuit then you may want to ask both ISPs if they can announce your routes for you. Provider 2 will need an LOA from provider 1 authorizing them to announce the address blocks. You'll have to coordinate you're inbound routing policies with them. Provider 2 can use BGP communities and/or AS padding to prefer Provider 1 over their connection. For outbound traffic you would just need two default routes on your MikroTik, one with a higher preference than the other. I have several consulting clients who operate in the above configuration, and we've offered that service for a few of our dedicated internet customers in the past. -- Blake Covarrubias On Dec 1, 2010, at 4:23 PM, Jeremie Chism wrote: > I would want to maintain basic surfing and VoIP traffic. > > Sent from my iPhone4 > > On Dec 1, 2010, at 5:01 PM, Matt <lm7...@gmail.com> wrote: > >>> We do this today with Mikrotik routers. Don't need the bgp part of it for >>> "just" a backup service. >> >> Pretty sure this 'wont' work without BGP if you want your clients >> public IP's to be directly accessable. >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
